Introduce Jackson 3 support for codecs

This commit introduces Jackson 3 variants of the following Jackson 2
classes (and related dependent classes).

org.springframework.http.codec.json.Jackson2CodecSupport ->
org.springframework.http.codec.JacksonCodecSupport

org.springframework.http.codec.json.Jackson2Tokenizer ->
org.springframework.http.codec.JacksonTokenizer

org.springframework.http.codec.json.Jackson2SmileDecoder ->
org.springframework.http.codec.smile.JacksonSmileDecoder

org.springframework.http.codec.json.Jackson2SmileEncoder ->
org.springframework.http.codec.smile.JacksonSmileEncoder

Jackson2CborDecoder -> JacksonCborDecoder
Jackson2CborEncoder -> JacksonCborEncoder
Jackson2JsonDecoder -> JacksonJsonDecoder
Jackson2JsonEncoder -> JacksonJsonEncoder

Jackson 3 support is configured if found in the classpath otherwise
fallback to Jackson 2.

See gh-33798

spring-web/spring-web.gradle

@@ -57,6 +57,12 @@ dependencies {
 	optional("org.jetbrains.kotlinx:kotlinx-serialization-cbor")
 	optional("org.jetbrains.kotlinx:kotlinx-serialization-json")
 	optional("org.jetbrains.kotlinx:kotlinx-serialization-protobuf")
+	optional("tools.jackson.core:jackson-databind")
+	optional("tools.jackson.dataformat:jackson-dataformat-smile")
+	optional("tools.jackson.dataformat:jackson-dataformat-cbor")
+	optional("tools.jackson.dataformat:jackson-dataformat-smile")
+	optional("tools.jackson.dataformat:jackson-dataformat-xml")
+	optional("tools.jackson.dataformat:jackson-dataformat-yaml")
 	optional("com.fasterxml:aalto-xml")  // out of order to avoid XML parser override
 	testFixturesApi("jakarta.servlet:jakarta.servlet-api")
 	testFixturesApi("org.junit.jupiter:junit-jupiter-api")
@@ -89,6 +95,7 @@ dependencies {
 	testImplementation("org.skyscreamer:jsonassert")
 	testImplementation("org.xmlunit:xmlunit-assertj")
 	testImplementation("org.xmlunit:xmlunit-matchers")
+	testImplementation("tools.jackson.module:jackson-module-kotlin")
 	testRuntimeOnly("com.sun.xml.bind:jaxb-core")
 	testRuntimeOnly("com.sun.xml.bind:jaxb-impl")
 	testRuntimeOnly("jakarta.json:jakarta.json-api")

spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonDecoder.java

@@ -0,0 +1,298 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec;
+
+import java.lang.annotation.Annotation;
+import java.math.BigDecimal;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+
+import org.jspecify.annotations.Nullable;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.util.context.ContextView;
+import tools.jackson.core.JacksonException;
+import tools.jackson.core.exc.JacksonIOException;
+import tools.jackson.databind.DeserializationFeature;
+import tools.jackson.databind.JavaType;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectReader;
+import tools.jackson.databind.cfg.MapperBuilder;
+import tools.jackson.databind.exc.InvalidDefinitionException;
+import tools.jackson.databind.util.TokenBuffer;
+
+import org.springframework.core.MethodParameter;
+import org.springframework.core.ResolvableType;
+import org.springframework.core.codec.CodecException;
+import org.springframework.core.codec.DecodingException;
+import org.springframework.core.codec.Hints;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DataBufferLimitException;
+import org.springframework.core.io.buffer.DataBufferUtils;
+import org.springframework.core.io.buffer.PooledDataBuffer;
+import org.springframework.core.log.LogFormatUtils;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.util.Assert;
+import org.springframework.util.MimeType;
+
+/**
+ * Abstract base class for Jackson 3.x decoding, leveraging non-blocking parsing.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ */
+public abstract class AbstractJacksonDecoder extends JacksonCodecSupport implements HttpMessageDecoder<Object> {
+
+	private int maxInMemorySize = 256 * 1024;
+
+
+	/**
+	 * Construct a new instance with the provided {@link MapperBuilder builder}
+	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
+	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MimeType}s.
+	 */
+	protected AbstractJacksonDecoder(MapperBuilder<?, ?> builder, MimeType... mimeTypes) {
+		super(builder, mimeTypes);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link ObjectMapper} and {@link MimeType}s.
+	 */
+	protected AbstractJacksonDecoder(ObjectMapper mapper, MimeType... mimeTypes) {
+		super(mapper, mimeTypes);
+	}
+
+	/**
+	 * Set the max number of bytes that can be buffered by this decoder. This
+	 * is either the size of the entire input when decoding as a whole, or the
+	 * size of one top-level JSON object within a JSON stream. When the limit
+	 * is exceeded, {@link DataBufferLimitException} is raised.
+	 * <p>By default this is set to 256K.
+	 * @param byteCount the max number of bytes to buffer, or -1 for unlimited
+	 */
+	public void setMaxInMemorySize(int byteCount) {
+		this.maxInMemorySize = byteCount;
+	}
+
+	/**
+	 * Return the {@link #setMaxInMemorySize configured} byte count limit.
+	 */
+	public int getMaxInMemorySize() {
+		return this.maxInMemorySize;
+	}
+
+
+	@Override
+	public boolean canDecode(ResolvableType elementType, @Nullable MimeType mimeType) {
+		if (!supportsMimeType(mimeType)) {
+			return false;
+		}
+		ObjectMapper mapper = selectObjectMapper(elementType, mimeType);
+		if (mapper == null) {
+			return false;
+		}
+		return !CharSequence.class.isAssignableFrom(elementType.toClass());
+	}
+
+	@Override
+	public Flux<Object> decode(Publisher<DataBuffer> input, ResolvableType elementType,
+			@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
+
+		ObjectMapper mapper = selectObjectMapper(elementType, mimeType);
+		if (mapper == null) {
+			return Flux.error(new IllegalStateException("No ObjectMapper for " + elementType));
+		}
+
+		boolean forceUseOfBigDecimal = mapper.isEnabled(DeserializationFeature.USE_BIG_DECIMAL_FOR_FLOATS);
+		if (BigDecimal.class.equals(elementType.getType())) {
+			forceUseOfBigDecimal = true;
+		}
+
+		boolean tokenizeArrays = (!elementType.isArray() &&
+				!Collection.class.isAssignableFrom(elementType.resolve(Object.class)));
+
+		Flux<DataBuffer> processed = processInput(input, elementType, mimeType, hints);
+		Flux<TokenBuffer> tokens = JacksonTokenizer.tokenize(processed, mapper,
+				tokenizeArrays, forceUseOfBigDecimal, getMaxInMemorySize());
+
+		return Flux.deferContextual(contextView -> {
+
+			Map<String, Object> hintsToUse = contextView.isEmpty() ? hints :
+					Hints.merge(hints, ContextView.class.getName(), contextView);
+
+			ObjectReader reader = createObjectReader(mapper, elementType, hintsToUse);
+
+			return tokens.handle((tokenBuffer, sink) -> {
+				try {
+					Object value = reader.readValue(tokenBuffer.asParser(getObjectMapper()._deserializationContext()));
+					logValue(value, hints);
+					if (value != null) {
+						sink.next(value);
+					}
+				}
+				catch (JacksonException ex) {
+					sink.error(processException(ex));
+				}
+			})
+			.doOnDiscard(PooledDataBuffer.class, DataBufferUtils::release);
+		});
+	}
+
+	/**
+	 * Process the input publisher into a flux. Default implementation returns
+	 * {@link Flux#from(Publisher)}, but subclasses can choose to customize
+	 * this behavior.
+	 * @param input the {@code DataBuffer} input stream to process
+	 * @param elementType the expected type of elements in the output stream
+	 * @param mimeType the MIME type associated with the input stream (optional)
+	 * @param hints additional information about how to do encode
+	 * @return the processed flux
+	 */
+	protected Flux<DataBuffer> processInput(Publisher<DataBuffer> input, ResolvableType elementType,
+			@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
+
+		return Flux.from(input);
+	}
+
+	@Override
+	public Mono<Object> decodeToMono(Publisher<DataBuffer> input, ResolvableType elementType,
+			@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
+
+		return Mono.deferContextual(contextView -> {
+
+			Map<String, Object> hintsToUse = contextView.isEmpty() ? hints :
+					Hints.merge(hints, ContextView.class.getName(), contextView);
+
+			return DataBufferUtils.join(input, this.maxInMemorySize).flatMap(dataBuffer ->
+					Mono.justOrEmpty(decode(dataBuffer, elementType, mimeType, hintsToUse)));
+		});
+	}
+
+	@Override
+	public Object decode(DataBuffer dataBuffer, ResolvableType targetType,
+			@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) throws DecodingException {
+
+		ObjectMapper mapper = selectObjectMapper(targetType, mimeType);
+		if (mapper == null) {
+			throw new IllegalStateException("No ObjectMapper for " + targetType);
+		}
+
+		try {
+			ObjectReader objectReader = createObjectReader(mapper, targetType, hints);
+			Object value = objectReader.readValue(dataBuffer.asInputStream());
+			logValue(value, hints);
+			return value;
+		}
+		catch (JacksonException ex) {
+			throw processException(ex);
+		}
+		finally {
+			DataBufferUtils.release(dataBuffer);
+		}
+	}
+
+	private ObjectReader createObjectReader(
+			ObjectMapper mapper, ResolvableType elementType, @Nullable Map<String, Object> hints) {
+
+		Assert.notNull(elementType, "'elementType' must not be null");
+		Class<?> contextClass = getContextClass(elementType);
+		if (contextClass == null && hints != null) {
+			contextClass = getContextClass((ResolvableType) hints.get(ACTUAL_TYPE_HINT));
+		}
+		JavaType javaType = getJavaType(elementType.getType(), contextClass);
+		Class<?> jsonView = (hints != null ? (Class<?>) hints.get(JacksonCodecSupport.JSON_VIEW_HINT) : null);
+
+		ObjectReader objectReader = (jsonView != null ?
+				mapper.readerWithView(jsonView).forType(javaType) :
+				mapper.readerFor(javaType));
+
+		return customizeReader(objectReader, elementType, hints);
+	}
+
+	/**
+	 * Subclasses can use this method to customize {@link ObjectReader} used
+	 * for reading values.
+	 * @param reader the reader instance to customize
+	 * @param elementType the target type of element values to read to
+	 * @param hints a map with serialization hints;
+	 * the Reactor Context, when available, may be accessed under the key
+	 * {@code ContextView.class.getName()}
+	 * @return the customized {@code ObjectReader} to use
+	 */
+	protected ObjectReader customizeReader(
+			ObjectReader reader, ResolvableType elementType, @Nullable Map<String, Object> hints) {
+
+		return reader;
+	}
+
+	private @Nullable Class<?> getContextClass(@Nullable ResolvableType elementType) {
+		MethodParameter param = (elementType != null ? getParameter(elementType) : null);
+		return (param != null ? param.getContainingClass() : null);
+	}
+
+	private void logValue(@Nullable Object value, @Nullable Map<String, Object> hints) {
+		if (!Hints.isLoggingSuppressed(hints)) {
+			LogFormatUtils.traceDebug(logger, traceOn -> {
+				String formatted = LogFormatUtils.formatValue(value, !traceOn);
+				return Hints.getLogPrefix(hints) + "Decoded [" + formatted + "]";
+			});
+		}
+	}
+
+	private CodecException processException(JacksonException ex) {
+		if (ex instanceof InvalidDefinitionException ide) {
+			JavaType type = ide.getType();
+			return new CodecException("Type definition error: " + type, ex);
+		}
+		if (ex instanceof JacksonIOException) {
+			return new DecodingException("I/O error while parsing input stream", ex);
+		}
+		String originalMessage = ex.getOriginalMessage();
+		return new DecodingException("JSON decoding error: " + originalMessage, ex);
+	}
+
+
+	// HttpMessageDecoder
+
+	@Override
+	public Map<String, Object> getDecodeHints(ResolvableType actualType, ResolvableType elementType,
+			ServerHttpRequest request, ServerHttpResponse response) {
+
+		return getHints(actualType);
+	}
+
+	@Override
+	public List<MimeType> getDecodableMimeTypes() {
+		return getMimeTypes();
+	}
+
+	@Override
+	public List<MimeType> getDecodableMimeTypes(ResolvableType targetType) {
+		return getMimeTypes(targetType);
+	}
+
+	// JacksonCodecSupport
+
+	@Override
+	protected <A extends Annotation> @Nullable A getAnnotation(MethodParameter parameter, Class<A> annotType) {
+		return parameter.getParameterAnnotation(annotType);
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/AbstractJacksonEncoder.java

@@ -0,0 +1,444 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec;
+
+import java.lang.annotation.Annotation;
+import java.nio.charset.Charset;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import org.jspecify.annotations.Nullable;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.util.context.ContextView;
+import tools.jackson.core.JacksonException;
+import tools.jackson.core.JsonEncoding;
+import tools.jackson.core.JsonGenerator;
+import tools.jackson.core.exc.JacksonIOException;
+import tools.jackson.core.util.ByteArrayBuilder;
+import tools.jackson.databind.JavaType;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectWriter;
+import tools.jackson.databind.SequenceWriter;
+import tools.jackson.databind.cfg.MapperBuilder;
+import tools.jackson.databind.exc.InvalidDefinitionException;
+import tools.jackson.databind.ser.FilterProvider;
+
+import org.springframework.core.MethodParameter;
+import org.springframework.core.ResolvableType;
+import org.springframework.core.codec.CodecException;
+import org.springframework.core.codec.EncodingException;
+import org.springframework.core.codec.Hints;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DataBufferFactory;
+import org.springframework.core.log.LogFormatUtils;
+import org.springframework.http.MediaType;
+import org.springframework.http.converter.json.MappingJacksonValue;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
+import org.springframework.util.MimeType;
+
+/**
+ * Base class providing support methods for Jackson 3.x encoding. For non-streaming use
+ * cases, {@link Flux} elements are collected into a {@link List} before serialization for
+ * performance reasons.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ */
+public abstract class AbstractJacksonEncoder extends JacksonCodecSupport implements HttpMessageEncoder<Object> {
+
+	private static final byte[] NEWLINE_SEPARATOR = {'\n'};
+
+	private static final byte[] EMPTY_BYTES = new byte[0];
+
+	private static final Map<String, JsonEncoding> ENCODINGS;
+
+	static {
+		ENCODINGS = CollectionUtils.newHashMap(JsonEncoding.values().length);
+		for (JsonEncoding encoding : JsonEncoding.values()) {
+			ENCODINGS.put(encoding.getJavaName(), encoding);
+		}
+		ENCODINGS.put("US-ASCII", JsonEncoding.UTF8);
+	}
+
+
+	private final List<MediaType> streamingMediaTypes = new ArrayList<>(1);
+
+
+	/**
+	 * Construct a new instance with the provided {@link MapperBuilder builder}
+	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
+	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MimeType}s.
+	 */
+	protected AbstractJacksonEncoder(MapperBuilder<?, ?> builder, MimeType... mimeTypes) {
+		super(builder, mimeTypes);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link ObjectMapper} and {@link MimeType}s.
+	 */
+	protected AbstractJacksonEncoder(ObjectMapper mapper, MimeType... mimeTypes) {
+		super(mapper, mimeTypes);
+	}
+
+	/**
+	 * Configure "streaming" media types for which flushing should be performed
+	 * automatically vs at the end of the stream.
+	 */
+	public void setStreamingMediaTypes(List<MediaType> mediaTypes) {
+		this.streamingMediaTypes.clear();
+		this.streamingMediaTypes.addAll(mediaTypes);
+	}
+
+	@Override
+	public boolean canEncode(ResolvableType elementType, @Nullable MimeType mimeType) {
+		if (!supportsMimeType(mimeType)) {
+			return false;
+		}
+		if (mimeType != null && mimeType.getCharset() != null) {
+			Charset charset = mimeType.getCharset();
+			if (!ENCODINGS.containsKey(charset.name())) {
+				return false;
+			}
+		}
+		if (this.objectMapperRegistrations != null && selectObjectMapper(elementType, mimeType) == null) {
+			return false;
+		}
+		Class<?> clazz = elementType.resolve();
+		if (clazz == null) {
+			return true;
+		}
+		if (MappingJacksonValue.class.isAssignableFrom(elementType.resolve(clazz))) {
+			throw new UnsupportedOperationException("MappingJacksonValue is not supported, use hints instead");
+		}
+		return !String.class.isAssignableFrom(elementType.resolve(clazz));
+	}
+
+	@Override
+	public Flux<DataBuffer> encode(Publisher<?> inputStream, DataBufferFactory bufferFactory,
+			ResolvableType elementType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
+
+		Assert.notNull(inputStream, "'inputStream' must not be null");
+		Assert.notNull(bufferFactory, "'bufferFactory' must not be null");
+		Assert.notNull(elementType, "'elementType' must not be null");
+
+		return Flux.deferContextual(contextView -> {
+
+			Map<String, Object> hintsToUse = contextView.isEmpty() ? hints :
+					Hints.merge(hints, ContextView.class.getName(), contextView);
+
+			if (inputStream instanceof Mono) {
+				return Mono.from(inputStream)
+						.map(value -> encodeValue(value, bufferFactory, elementType, mimeType, hintsToUse))
+						.flux();
+			}
+
+			try {
+				ObjectMapper mapper = selectObjectMapper(elementType, mimeType);
+				if (mapper == null) {
+					throw new IllegalStateException("No ObjectMapper for " + elementType);
+				}
+
+				ObjectWriter writer = createObjectWriter(mapper, elementType, mimeType, null, hintsToUse);
+				ByteArrayBuilder byteBuilder = new ByteArrayBuilder(writer.generatorFactory()._getBufferRecycler());
+				JsonEncoding encoding = getJsonEncoding(mimeType);
+				JsonGenerator generator = mapper.createGenerator(byteBuilder, encoding);
+				SequenceWriter sequenceWriter = writer.writeValues(generator);
+
+				byte[] separator = getStreamingMediaTypeSeparator(mimeType);
+				Flux<DataBuffer> dataBufferFlux;
+
+				if (separator != null) {
+					dataBufferFlux = Flux.from(inputStream).map(value -> encodeStreamingValue(
+							value, bufferFactory, hintsToUse, sequenceWriter, byteBuilder, EMPTY_BYTES, separator));
+				}
+				else {
+					JsonArrayJoinHelper helper = new JsonArrayJoinHelper();
+
+					// Do not prepend JSON array prefix until first signal is known, onNext vs onError
+					// Keeps response not committed for error handling
+
+					dataBufferFlux = Flux.from(inputStream)
+							.map(value -> {
+								byte[] prefix = helper.getPrefix();
+								byte[] delimiter = helper.getDelimiter();
+
+								DataBuffer dataBuffer = encodeStreamingValue(
+										value, bufferFactory, hintsToUse, sequenceWriter, byteBuilder,
+										delimiter, EMPTY_BYTES);
+
+								return (prefix.length > 0 ?
+										bufferFactory.join(List.of(bufferFactory.wrap(prefix), dataBuffer)) :
+										dataBuffer);
+							})
+							.switchIfEmpty(Mono.fromCallable(() -> bufferFactory.wrap(helper.getPrefix())))
+							.concatWith(Mono.fromCallable(() -> bufferFactory.wrap(helper.getSuffix())));
+				}
+
+				return dataBufferFlux
+						.doOnNext(dataBuffer -> Hints.touchDataBuffer(dataBuffer, hintsToUse, logger))
+						.doAfterTerminate(() -> {
+							try {
+								generator.close();
+								byteBuilder.release();
+							}
+							catch (JacksonIOException ex) {
+								logger.error("Could not close Encoder resources", ex);
+							}
+						});
+			}
+			catch (JacksonIOException ex) {
+				return Flux.error(ex);
+			}
+		});
+	}
+
+	@Override
+	public DataBuffer encodeValue(Object value, DataBufferFactory bufferFactory,
+			ResolvableType valueType, @Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
+
+		Class<?> jsonView = null;
+		FilterProvider filters = null;
+		if (hints != null) {
+			jsonView = (Class<?>) hints.get(JSON_VIEW_HINT);
+			filters = (FilterProvider) hints.get(FILTER_PROVIDER_HINT);
+		}
+
+		ObjectMapper mapper = selectObjectMapper(valueType, mimeType);
+		if (mapper == null) {
+			throw new IllegalStateException("No ObjectMapper for " + valueType);
+		}
+
+		ObjectWriter writer = createObjectWriter(mapper, valueType, mimeType, jsonView, hints);
+		if (filters != null) {
+			writer = writer.with(filters);
+		}
+
+		ByteArrayBuilder byteBuilder = new ByteArrayBuilder(writer.generatorFactory()._getBufferRecycler());
+		try {
+			JsonEncoding encoding = getJsonEncoding(mimeType);
+
+			logValue(hints, value);
+
+			try (JsonGenerator generator = writer.createGenerator(byteBuilder, encoding)) {
+				writer.writeValue(generator, value);
+				generator.flush();
+			}
+			catch (InvalidDefinitionException ex) {
+				throw new CodecException("Type definition error: " + ex.getType(), ex);
+			}
+			catch (JacksonException ex) {
+				throw new EncodingException("JSON encoding error: " + ex.getOriginalMessage(), ex);
+			}
+
+			byte[] bytes = byteBuilder.toByteArray();
+			DataBuffer buffer = bufferFactory.allocateBuffer(bytes.length);
+			buffer.write(bytes);
+			Hints.touchDataBuffer(buffer, hints, logger);
+
+			return buffer;
+		}
+		finally {
+			byteBuilder.release();
+		}
+	}
+
+	private DataBuffer encodeStreamingValue(
+			Object value, DataBufferFactory bufferFactory, @Nullable Map<String, Object> hints,
+			SequenceWriter sequenceWriter, ByteArrayBuilder byteArrayBuilder,
+			byte[] prefix, byte[] suffix) {
+
+		logValue(hints, value);
+
+		try {
+			sequenceWriter.write(value);
+			sequenceWriter.flush();
+		}
+		catch (InvalidDefinitionException ex) {
+			throw new CodecException("Type definition error: " + ex.getType(), ex);
+		}
+		catch (JacksonException ex) {
+			throw new EncodingException("JSON encoding error: " + ex.getOriginalMessage(), ex);
+		}
+
+		byte[] bytes = byteArrayBuilder.toByteArray();
+		byteArrayBuilder.reset();
+
+		int offset;
+		int length;
+		if (bytes.length > 0 && bytes[0] == ' ') {
+			// SequenceWriter writes an unnecessary space in between values
+			offset = 1;
+			length = bytes.length - 1;
+		}
+		else {
+			offset = 0;
+			length = bytes.length;
+		}
+		DataBuffer buffer = bufferFactory.allocateBuffer(length + prefix.length + suffix.length);
+		if (prefix.length != 0) {
+			buffer.write(prefix);
+		}
+		buffer.write(bytes, offset, length);
+		if (suffix.length != 0) {
+			buffer.write(suffix);
+		}
+		Hints.touchDataBuffer(buffer, hints, logger);
+
+		return buffer;
+	}
+
+	private void logValue(@Nullable Map<String, Object> hints, Object value) {
+		if (!Hints.isLoggingSuppressed(hints)) {
+			LogFormatUtils.traceDebug(logger, traceOn -> {
+				String formatted = LogFormatUtils.formatValue(value, !traceOn);
+				return Hints.getLogPrefix(hints) + "Encoding [" + formatted + "]";
+			});
+		}
+	}
+
+	private ObjectWriter createObjectWriter(
+			ObjectMapper mapper, ResolvableType valueType, @Nullable MimeType mimeType,
+			@Nullable Class<?> jsonView, @Nullable Map<String, Object> hints) {
+
+		JavaType javaType = getJavaType(valueType.getType(), null);
+		if (jsonView == null && hints != null) {
+			jsonView = (Class<?>) hints.get(JacksonCodecSupport.JSON_VIEW_HINT);
+		}
+		ObjectWriter writer = (jsonView != null ? mapper.writerWithView(jsonView) : mapper.writer());
+		if (javaType.isContainerType()) {
+			writer = writer.forType(javaType);
+		}
+		return customizeWriter(writer, mimeType, valueType, hints);
+	}
+
+	/**
+	 * Subclasses can use this method to customize the {@link ObjectWriter} used
+	 * for writing values.
+	 * @param writer the writer instance to customize
+	 * @param mimeType the selected MIME type
+	 * @param elementType the type of element values to write
+	 * @param hints a map with serialization hints; the Reactor Context, when
+	 * available, may be accessed under the key
+	 * {@code ContextView.class.getName()}
+	 * @return the customized {@code ObjectWriter} to use
+	 */
+	protected ObjectWriter customizeWriter(ObjectWriter writer, @Nullable MimeType mimeType,
+			ResolvableType elementType, @Nullable Map<String, Object> hints) {
+
+		return writer;
+	}
+
+	/**
+	 * Return the separator to use for the given mime type.
+	 * <p>By default, this method returns new line {@code "\n"} if the given
+	 * mime type is one of the configured {@link #setStreamingMediaTypes(List)
+	 * streaming} mime types.
+	 */
+	protected byte @Nullable [] getStreamingMediaTypeSeparator(@Nullable MimeType mimeType) {
+		for (MediaType streamingMediaType : this.streamingMediaTypes) {
+			if (streamingMediaType.isCompatibleWith(mimeType)) {
+				return NEWLINE_SEPARATOR;
+			}
+		}
+		return null;
+	}
+
+	/**
+	 * Determine the JSON encoding to use for the given mime type.
+	 * @param mimeType the mime type as requested by the caller
+	 * @return the JSON encoding to use (never {@code null})
+	 */
+	protected JsonEncoding getJsonEncoding(@Nullable MimeType mimeType) {
+		if (mimeType != null && mimeType.getCharset() != null) {
+			Charset charset = mimeType.getCharset();
+			JsonEncoding result = ENCODINGS.get(charset.name());
+			if (result != null) {
+				return result;
+			}
+		}
+		return JsonEncoding.UTF8;
+	}
+
+
+	// HttpMessageEncoder
+
+	@Override
+	public List<MimeType> getEncodableMimeTypes() {
+		return getMimeTypes();
+	}
+
+	@Override
+	public List<MimeType> getEncodableMimeTypes(ResolvableType elementType) {
+		return getMimeTypes(elementType);
+	}
+
+	@Override
+	public List<MediaType> getStreamingMediaTypes() {
+		return Collections.unmodifiableList(this.streamingMediaTypes);
+	}
+
+	@Override
+	public Map<String, Object> getEncodeHints(@Nullable ResolvableType actualType, ResolvableType elementType,
+			@Nullable MediaType mediaType, ServerHttpRequest request, ServerHttpResponse response) {
+
+		return (actualType != null ? getHints(actualType) : Hints.none());
+	}
+
+
+	// JacksonCodecSupport
+
+	@Override
+	protected <A extends Annotation> @Nullable A getAnnotation(MethodParameter parameter, Class<A> annotType) {
+		return parameter.getMethodAnnotation(annotType);
+	}
+
+
+	private static class JsonArrayJoinHelper {
+
+		private static final byte[] COMMA_SEPARATOR = {','};
+
+		private static final byte[] OPEN_BRACKET = {'['};
+
+		private static final byte[] CLOSE_BRACKET = {']'};
+
+		private boolean firstItemEmitted;
+
+		public byte[] getDelimiter() {
+			if (this.firstItemEmitted) {
+				return COMMA_SEPARATOR;
+			}
+			this.firstItemEmitted = true;
+			return EMPTY_BYTES;
+		}
+
+		public byte[] getPrefix() {
+			return (this.firstItemEmitted ? EMPTY_BYTES : OPEN_BRACKET);
+		}
+
+		public byte[] getSuffix() {
+			return CLOSE_BRACKET;
+		}
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/CodecConfigurer.java

@@ -23,6 +23,8 @@ import org.jspecify.annotations.Nullable;
 
 import org.springframework.core.codec.Decoder;
 import org.springframework.core.codec.Encoder;
+import org.springframework.http.codec.smile.JacksonSmileDecoder;
+import org.springframework.http.codec.smile.JacksonSmileEncoder;
 
 /**
  * Defines a common interface for configuring either client or server HTTP
@@ -109,7 +111,16 @@ public interface CodecConfigurer {
 	interface DefaultCodecs {
 
 		/**
-		 * Override the default Jackson JSON {@code Decoder}.
+		 * Override the default Jackson 3.x JSON {@code Decoder}.
+		 * <p>Note that {@link #maxInMemorySize(int)}, if configured, will be
+		 * applied to the given decoder.
+		 * @param decoder the decoder instance to use
+		 * @see org.springframework.http.codec.json.JacksonJsonDecoder
+		 */
+		void jacksonJsonDecoder(Decoder<?> decoder);
+
+		/**
+		 * Override the default Jackson 2.x JSON {@code Decoder}.
 		 * <p>Note that {@link #maxInMemorySize(int)}, if configured, will be
 		 * applied to the given decoder.
 		 * @param decoder the decoder instance to use
@@ -118,14 +129,30 @@ public interface CodecConfigurer {
 		void jackson2JsonDecoder(Decoder<?> decoder);
 
 		/**
-		 * Override the default Jackson JSON {@code Encoder}.
+		 * Override the default Jackson 3.x JSON {@code Encoder}.
+		 * @param encoder the encoder instance to use
+		 * @see org.springframework.http.codec.json.JacksonJsonEncoder
+		 */
+		void jacksonJsonEncoder(Encoder<?> encoder);
+
+		/**
+		 * Override the default Jackson 2.x JSON {@code Encoder}.
 		 * @param encoder the encoder instance to use
 		 * @see org.springframework.http.codec.json.Jackson2JsonEncoder
 		 */
 		void jackson2JsonEncoder(Encoder<?> encoder);
 
 		/**
-		 * Override the default Jackson Smile {@code Decoder}.
+		 * Override the default Jackson 3.x Smile {@code Decoder}.
+		 * <p>Note that {@link #maxInMemorySize(int)}, if configured, will be
+		 * applied to the given decoder.
+		 * @param decoder the decoder instance to use
+		 * @see JacksonSmileDecoder
+		 */
+		void jacksonSmileDecoder(Decoder<?> decoder);
+
+		/**
+		 * Override the default Jackson 2.x Smile {@code Decoder}.
 		 * <p>Note that {@link #maxInMemorySize(int)}, if configured, will be
 		 * applied to the given decoder.
 		 * @param decoder the decoder instance to use
@@ -134,7 +161,14 @@ public interface CodecConfigurer {
 		void jackson2SmileDecoder(Decoder<?> decoder);
 
 		/**
-		 * Override the default Jackson Smile {@code Encoder}.
+		 * Override the default Jackson 3.x Smile {@code Encoder}.
+		 * @param encoder the encoder instance to use
+		 * @see JacksonSmileEncoder
+		 */
+		void jacksonSmileEncoder(Encoder<?> encoder);
+
+		/**
+		 * Override the default Jackson 2.x Smile {@code Encoder}.
 		 * @param encoder the encoder instance to use
 		 * @see org.springframework.http.codec.json.Jackson2SmileEncoder
 		 */

spring-web/src/main/java/org/springframework/http/codec/JacksonCodecSupport.java

@@ -0,0 +1,275 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec;
+
+import java.lang.annotation.Annotation;
+import java.lang.reflect.Type;
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.function.Consumer;
+
+import com.fasterxml.jackson.annotation.JsonView;
+import org.apache.commons.logging.Log;
+import org.jspecify.annotations.Nullable;
+import tools.jackson.databind.JacksonModule;
+import tools.jackson.databind.JavaType;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.cfg.MapperBuilder;
+import tools.jackson.databind.ser.FilterProvider;
+
+import org.springframework.core.GenericTypeResolver;
+import org.springframework.core.MethodParameter;
+import org.springframework.core.ResolvableType;
+import org.springframework.core.codec.Hints;
+import org.springframework.http.HttpLogging;
+import org.springframework.http.MediaType;
+import org.springframework.http.ProblemDetail;
+import org.springframework.http.server.reactive.ServerHttpRequest;
+import org.springframework.http.server.reactive.ServerHttpResponse;
+import org.springframework.util.Assert;
+import org.springframework.util.CollectionUtils;
+import org.springframework.util.MimeType;
+
+/**
+ * Base class providing support methods for Jackson 2.x encoding and decoding.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ */
+public abstract class JacksonCodecSupport {
+
+	/**
+	 * The key for the hint to specify a "JSON View" for encoding or decoding
+	 * with the value expected to be a {@link Class}.
+	 */
+	public static final String JSON_VIEW_HINT = JsonView.class.getName();
+
+	/**
+	 * The key for the hint to specify a {@link FilterProvider}.
+	 */
+	public static final String FILTER_PROVIDER_HINT = FilterProvider.class.getName();
+
+	/**
+	 * The key for the hint to access the actual ResolvableType passed into
+	 * {@link org.springframework.http.codec.HttpMessageReader#read(ResolvableType, ResolvableType, ServerHttpRequest, ServerHttpResponse, Map)}
+	 * (server-side only). Currently set when the method argument has generics because
+	 * in case of reactive types, use of {@code ResolvableType.getGeneric()} means no
+	 * MethodParameter source and no knowledge of the containing class.
+	 */
+	static final String ACTUAL_TYPE_HINT = JacksonCodecSupport.class.getName() + ".actualType";
+
+	private static final String JSON_VIEW_HINT_ERROR =
+			"@JsonView only supported for write hints with exactly 1 class argument: ";
+
+
+	protected final Log logger = HttpLogging.forLogName(getClass());
+
+	private final ObjectMapper defaultObjectMapper;
+
+	protected @Nullable Map<Class<?>, Map<MimeType, ObjectMapper>> objectMapperRegistrations;
+
+	private final List<MimeType> mimeTypes;
+
+	private static volatile @Nullable List<JacksonModule> modules = null;
+
+	/**
+	 * Construct a new instance with the provided {@link MapperBuilder builder}
+	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
+	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MimeType}s.
+	 */
+	protected JacksonCodecSupport(MapperBuilder<?, ?> builder, MimeType... mimeTypes) {
+		Assert.notNull(builder, "MapperBuilder must not be null");
+		Assert.notEmpty(mimeTypes, "MimeTypes must not be empty");
+		this.defaultObjectMapper = builder.addModules(initModules()).build();
+		this.mimeTypes = List.of(mimeTypes);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link ObjectMapper}
+	 * customized with the {@link tools.jackson.databind.JacksonModule}s found
+	 * by {@link MapperBuilder#findModules(ClassLoader)} and {@link MimeType}s.
+	 */
+	protected JacksonCodecSupport(ObjectMapper objectMapper, MimeType... mimeTypes) {
+		Assert.notNull(objectMapper, "ObjectMapper must not be null");
+		Assert.notEmpty(mimeTypes, "MimeTypes must not be empty");
+		this.defaultObjectMapper = objectMapper;
+		this.mimeTypes = List.of(mimeTypes);
+	}
+
+	private List<JacksonModule> initModules() {
+		if (modules == null) {
+			modules = MapperBuilder.findModules(JacksonCodecSupport.class.getClassLoader());
+
+		}
+		return Objects.requireNonNull(modules);
+	}
+
+	/**
+	 * Return the {@link ObjectMapper configured} default ObjectMapper.
+	 */
+	public ObjectMapper getObjectMapper() {
+		return this.defaultObjectMapper;
+	}
+
+	/**
+	 * Configure the {@link ObjectMapper} instances to use for the given
+	 * {@link Class}. This is useful when you want to deviate from the
+	 * {@link #getObjectMapper() default} ObjectMapper or have the
+	 * {@code ObjectMapper} vary by {@code MediaType}.
+	 * <p><strong>Note:</strong> Use of this method effectively turns off use of
+	 * the default {@link #getObjectMapper() ObjectMapper} and supported
+	 * {@link #getMimeTypes() MimeTypes} for the given class. Therefore it is
+	 * important for the mappings configured here to
+	 * {@link MediaType#includes(MediaType) include} every MediaType that must
+	 * be supported for the given class.
+	 * @param clazz the type of Object to register ObjectMapper instances for
+	 * @param registrar a consumer to populate or otherwise update the
+	 * MediaType-to-ObjectMapper associations for the given Class
+	 */
+	public void registerObjectMappersForType(Class<?> clazz, Consumer<Map<MimeType, ObjectMapper>> registrar) {
+		if (this.objectMapperRegistrations == null) {
+			this.objectMapperRegistrations = new LinkedHashMap<>();
+		}
+		Map<MimeType, ObjectMapper> registrations =
+				this.objectMapperRegistrations.computeIfAbsent(clazz, c -> new LinkedHashMap<>());
+		registrar.accept(registrations);
+	}
+
+	/**
+	 * Return ObjectMapper registrations for the given class, if any.
+	 * @param clazz the class to look up for registrations for
+	 * @return a map with registered MediaType-to-ObjectMapper registrations,
+	 * or empty if in case of no registrations for the given class.
+	 */
+	public @Nullable Map<MimeType, ObjectMapper> getObjectMappersForType(Class<?> clazz) {
+		for (Map.Entry<Class<?>, Map<MimeType, ObjectMapper>> entry : getObjectMapperRegistrations().entrySet()) {
+			if (entry.getKey().isAssignableFrom(clazz)) {
+				return entry.getValue();
+			}
+		}
+		return Collections.emptyMap();
+	}
+
+	protected Map<Class<?>, Map<MimeType, ObjectMapper>> getObjectMapperRegistrations() {
+		return (this.objectMapperRegistrations != null ? this.objectMapperRegistrations : Collections.emptyMap());
+	}
+
+	/**
+	 * Subclasses should expose this as "decodable" or "encodable" mime types.
+	 */
+	protected List<MimeType> getMimeTypes() {
+		return this.mimeTypes;
+	}
+
+	protected List<MimeType> getMimeTypes(ResolvableType elementType) {
+		Class<?> elementClass = elementType.toClass();
+		List<MimeType> result = null;
+		for (Map.Entry<Class<?>, Map<MimeType, ObjectMapper>> entry : getObjectMapperRegistrations().entrySet()) {
+			if (entry.getKey().isAssignableFrom(elementClass)) {
+				result = (result != null ? result : new ArrayList<>(entry.getValue().size()));
+				result.addAll(entry.getValue().keySet());
+			}
+		}
+		if (!CollectionUtils.isEmpty(result)) {
+			return result;
+		}
+		return (ProblemDetail.class.isAssignableFrom(elementClass) ? getMediaTypesForProblemDetail() : getMimeTypes());
+	}
+
+	/**
+	 * Return the supported media type(s) for {@link ProblemDetail}.
+	 * By default, an empty list, unless overridden in subclasses.
+	 */
+	protected List<MimeType> getMediaTypesForProblemDetail() {
+		return Collections.emptyList();
+	}
+
+	protected boolean supportsMimeType(@Nullable MimeType mimeType) {
+		if (mimeType == null) {
+			return true;
+		}
+		for (MimeType supportedMimeType : this.mimeTypes) {
+			if (supportedMimeType.isCompatibleWith(mimeType)) {
+				return true;
+			}
+		}
+		return false;
+	}
+
+	protected JavaType getJavaType(Type type, @Nullable Class<?> contextClass) {
+		return this.defaultObjectMapper.constructType(GenericTypeResolver.resolveType(type, contextClass));
+	}
+
+	protected Map<String, Object> getHints(ResolvableType resolvableType) {
+		MethodParameter param = getParameter(resolvableType);
+		if (param != null) {
+			Map<String, Object> hints = null;
+			if (resolvableType.hasGenerics()) {
+				hints = new HashMap<>(2);
+				hints.put(ACTUAL_TYPE_HINT, resolvableType);
+			}
+			JsonView annotation = getAnnotation(param, JsonView.class);
+			if (annotation != null) {
+				Class<?>[] classes = annotation.value();
+				Assert.isTrue(classes.length == 1, () -> JSON_VIEW_HINT_ERROR + param);
+				hints = (hints != null ? hints : new HashMap<>(1));
+				hints.put(JSON_VIEW_HINT, classes[0]);
+			}
+			if (hints != null) {
+				return hints;
+			}
+		}
+		return Hints.none();
+	}
+
+	protected @Nullable MethodParameter getParameter(ResolvableType type) {
+		return (type.getSource() instanceof MethodParameter methodParameter ? methodParameter : null);
+	}
+
+	protected abstract <A extends Annotation> @Nullable A getAnnotation(MethodParameter parameter, Class<A> annotType);
+
+	/**
+	 * Select an ObjectMapper to use, either the main ObjectMapper or another
+	 * if the handling for the given Class has been customized through
+	 * {@link #registerObjectMappersForType(Class, Consumer)}.
+	 */
+	protected @Nullable ObjectMapper selectObjectMapper(ResolvableType targetType, @Nullable MimeType targetMimeType) {
+		if (targetMimeType == null || CollectionUtils.isEmpty(this.objectMapperRegistrations)) {
+			return this.defaultObjectMapper;
+		}
+		Class<?> targetClass = targetType.toClass();
+		for (Map.Entry<Class<?>, Map<MimeType, ObjectMapper>> typeEntry : getObjectMapperRegistrations().entrySet()) {
+			if (typeEntry.getKey().isAssignableFrom(targetClass)) {
+				for (Map.Entry<MimeType, ObjectMapper> objectMapperEntry : typeEntry.getValue().entrySet()) {
+					if (objectMapperEntry.getKey().includes(targetMimeType)) {
+						return objectMapperEntry.getValue();
+					}
+				}
+				// No matching registrations
+				return null;
+			}
+		}
+		// No registrations
+		return this.defaultObjectMapper;
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/JacksonTokenizer.java

@@ -0,0 +1,241 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Function;
+
+import reactor.core.publisher.Flux;
+import tools.jackson.core.JacksonException;
+import tools.jackson.core.JsonParser;
+import tools.jackson.core.JsonToken;
+import tools.jackson.core.async.ByteArrayFeeder;
+import tools.jackson.core.async.ByteBufferFeeder;
+import tools.jackson.core.async.NonBlockingInputFeeder;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.util.TokenBuffer;
+
+import org.springframework.core.codec.DecodingException;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DataBufferLimitException;
+import org.springframework.core.io.buffer.DataBufferUtils;
+
+/**
+ * {@link Function} to transform a JSON stream of arbitrary size, byte array
+ * chunks into a {@code Flux<TokenBuffer>} where each token buffer is a
+ * well-formed JSON object with Jackson 3.x.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ */
+final class JacksonTokenizer {
+
+	private final JsonParser parser;
+
+	private final NonBlockingInputFeeder inputFeeder;
+
+	private final boolean tokenizeArrayElements;
+
+	private final boolean forceUseOfBigDecimal;
+
+	private final int maxInMemorySize;
+
+	private int objectDepth;
+
+	private int arrayDepth;
+
+	private int byteCount;
+
+	private TokenBuffer tokenBuffer;
+
+
+	private JacksonTokenizer(JsonParser parser, boolean tokenizeArrayElements, boolean forceUseOfBigDecimal, int maxInMemorySize) {
+		this.parser = parser;
+		this.inputFeeder = this.parser.nonBlockingInputFeeder();
+		this.tokenizeArrayElements = tokenizeArrayElements;
+		this.forceUseOfBigDecimal = forceUseOfBigDecimal;
+		this.maxInMemorySize = maxInMemorySize;
+		this.tokenBuffer = createToken();
+	}
+
+
+	private List<TokenBuffer> tokenize(DataBuffer dataBuffer) {
+		try {
+			int bufferSize = dataBuffer.readableByteCount();
+			List<TokenBuffer> tokens = new ArrayList<>();
+			if (this.inputFeeder instanceof ByteBufferFeeder byteBufferFeeder) {
+				try (DataBuffer.ByteBufferIterator iterator = dataBuffer.readableByteBuffers()) {
+					while (iterator.hasNext()) {
+						byteBufferFeeder.feedInput(iterator.next());
+						parseTokens(tokens);
+					}
+				}
+			}
+			else if (this.inputFeeder instanceof ByteArrayFeeder byteArrayFeeder) {
+				byte[] bytes = new byte[bufferSize];
+				dataBuffer.read(bytes);
+				byteArrayFeeder.feedInput(bytes, 0, bufferSize);
+				parseTokens(tokens);
+			}
+			assertInMemorySize(bufferSize, tokens);
+			return tokens;
+		}
+		catch (JacksonException ex) {
+			throw new DecodingException("JSON decoding error: " + ex.getOriginalMessage(), ex);
+		}
+		finally {
+			DataBufferUtils.release(dataBuffer);
+		}
+	}
+
+	private Flux<TokenBuffer> endOfInput() {
+		return Flux.defer(() -> {
+			this.inputFeeder.endOfInput();
+			try {
+				List<TokenBuffer> tokens = new ArrayList<>();
+				parseTokens(tokens);
+				return Flux.fromIterable(tokens);
+			}
+			catch (JacksonException ex) {
+				throw new DecodingException("JSON decoding error: " + ex.getOriginalMessage(), ex);
+			}
+		});
+	}
+
+	private void parseTokens(List<TokenBuffer> tokens) {
+		// SPR-16151: Smile data format uses null to separate documents
+		boolean previousNull = false;
+		while (!this.parser.isClosed()) {
+			JsonToken token = this.parser.nextToken();
+			if (token == JsonToken.NOT_AVAILABLE ||
+					token == null && previousNull) {
+				break;
+			}
+			else if (token == null ) { // !previousNull
+				previousNull = true;
+				continue;
+			}
+			else {
+				previousNull = false;
+			}
+			updateDepth(token);
+			if (!this.tokenizeArrayElements) {
+				processTokenNormal(token, tokens);
+			}
+			else {
+				processTokenArray(token, tokens);
+			}
+		}
+	}
+
+	private void updateDepth(JsonToken token) {
+		switch (token) {
+			case START_OBJECT -> this.objectDepth++;
+			case END_OBJECT -> this.objectDepth--;
+			case START_ARRAY -> this.arrayDepth++;
+			case END_ARRAY -> this.arrayDepth--;
+		}
+	}
+
+	private void processTokenNormal(JsonToken token, List<TokenBuffer> result) {
+		this.tokenBuffer.copyCurrentEvent(this.parser);
+
+		if ((token.isStructEnd() || token.isScalarValue()) && this.objectDepth == 0 && this.arrayDepth == 0) {
+			result.add(this.tokenBuffer);
+			this.tokenBuffer = createToken();
+		}
+	}
+
+	private void processTokenArray(JsonToken token, List<TokenBuffer> result) {
+		if (!isTopLevelArrayToken(token)) {
+			this.tokenBuffer.copyCurrentEvent(this.parser);
+		}
+
+		if (this.objectDepth == 0 && (this.arrayDepth == 0 || this.arrayDepth == 1) &&
+				(token == JsonToken.END_OBJECT || token.isScalarValue())) {
+			result.add(this.tokenBuffer);
+			this.tokenBuffer = createToken();
+		}
+	}
+
+	private TokenBuffer createToken() {
+		TokenBuffer tokenBuffer = TokenBuffer.forBuffering(this.parser, this.parser.objectReadContext());
+		tokenBuffer.forceUseOfBigDecimal(this.forceUseOfBigDecimal);
+		return tokenBuffer;
+	}
+
+	private boolean isTopLevelArrayToken(JsonToken token) {
+		return this.objectDepth == 0 && ((token == JsonToken.START_ARRAY && this.arrayDepth == 1) ||
+				(token == JsonToken.END_ARRAY && this.arrayDepth == 0));
+	}
+
+	private void assertInMemorySize(int currentBufferSize, List<TokenBuffer> result) {
+		if (this.maxInMemorySize >= 0) {
+			if (!result.isEmpty()) {
+				this.byteCount = 0;
+			}
+			else if (currentBufferSize > Integer.MAX_VALUE - this.byteCount) {
+				raiseLimitException();
+			}
+			else {
+				this.byteCount += currentBufferSize;
+				if (this.byteCount > this.maxInMemorySize) {
+					raiseLimitException();
+				}
+			}
+		}
+	}
+
+	private void raiseLimitException() {
+		throw new DataBufferLimitException(
+				"Exceeded limit on max bytes per JSON object: " + this.maxInMemorySize);
+	}
+
+
+	/**
+	 * Tokenize the given {@code Flux<DataBuffer>} into {@code Flux<TokenBuffer>}.
+	 * @param dataBuffers the source data buffers
+	 * @param objectMapper the current mapper instance
+	 * @param tokenizeArrays if {@code true} and the "top level" JSON object is
+	 * an array, each element is returned individually immediately after it is received
+	 * @param forceUseOfBigDecimal if {@code true}, any floating point values encountered
+	 * in source will use {@link java.math.BigDecimal}
+	 * @param maxInMemorySize maximum memory size
+	 * @return the resulting token buffers
+	 */
+	public static Flux<TokenBuffer> tokenize(Flux<DataBuffer> dataBuffers,
+			ObjectMapper objectMapper, boolean tokenizeArrays, boolean forceUseOfBigDecimal, int maxInMemorySize) {
+
+		try {
+			JsonParser parser;
+			try {
+				parser = objectMapper.createNonBlockingByteBufferParser();
+			}
+			catch (UnsupportedOperationException ex) {
+				parser = objectMapper.createNonBlockingByteArrayParser();
+			}
+			JacksonTokenizer tokenizer =
+					new JacksonTokenizer(parser, tokenizeArrays, forceUseOfBigDecimal, maxInMemorySize);
+			return dataBuffers.concatMapIterable(tokenizer::tokenize).concatWith(tokenizer.endOfInput());
+		}
+		catch (JacksonException ex) {
+			return Flux.error(ex);
+		}
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/cbor/Jackson2CborDecoder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,7 +33,7 @@ import org.springframework.util.Assert;
 import org.springframework.util.MimeType;
 
 /**
- * Decode bytes into CBOR and convert to Object's with Jackson.
+ * Decode bytes into CBOR and convert to Object's with Jackson 2.x.
  * Stream decoding is not supported yet.
  *
  * @author Sebastien Deleuze

spring-web/src/main/java/org/springframework/http/codec/cbor/Jackson2CborEncoder.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -34,7 +34,7 @@ import org.springframework.util.Assert;
 import org.springframework.util.MimeType;
 
 /**
- * Encode from an {@code Object} to bytes of CBOR objects using Jackson.
+ * Encode from an {@code Object} to bytes of CBOR objects using Jackson 2.x.
  * Stream encoding is not supported yet.
  *
  * @author Sebastien Deleuze

spring-web/src/main/java/org/springframework/http/codec/cbor/JacksonCborDecoder.java

@@ -0,0 +1,76 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.cbor;
+
+import java.util.Map;
+
+import org.jspecify.annotations.Nullable;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+import tools.jackson.databind.cfg.MapperBuilder;
+import tools.jackson.dataformat.cbor.CBORMapper;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.AbstractJacksonDecoder;
+import org.springframework.util.MimeType;
+
+/**
+ * Decode bytes into CBOR and convert to Object's with Jackson 3.x.
+ * Stream decoding is not supported yet.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ * @see JacksonCborEncoder
+ * @see <a href="https://github.com/spring-projects/spring-framework/issues/20513">Add CBOR support to WebFlux</a>
+ */
+public class JacksonCborDecoder extends AbstractJacksonDecoder {
+
+	/**
+	 * Construct a new instance with a {@link CBORMapper} customized with the
+	 * {@link tools.jackson.databind.JacksonModule}s found by
+	 * {@link MapperBuilder#findModules(ClassLoader)}.
+	 */
+	public JacksonCborDecoder() {
+		super(CBORMapper.builder(), MediaType.APPLICATION_CBOR);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link CBORMapper}.
+	 */
+	public JacksonCborDecoder(CBORMapper mapper) {
+		super(mapper, MediaType.APPLICATION_CBOR);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link CBORMapper} and {@link MimeType}s.
+	 * @see CBORMapper#builder()
+	 * @see MapperBuilder#findAndAddModules(ClassLoader)
+	 */
+	public JacksonCborDecoder(CBORMapper mapper, MimeType... mimeTypes) {
+		super(mapper, mimeTypes);
+	}
+
+
+	@Override
+	public Flux<Object> decode(Publisher<DataBuffer> input, ResolvableType elementType, @Nullable MimeType mimeType,
+			@Nullable Map<String, Object> hints) {
+		throw new UnsupportedOperationException("Does not support stream decoding yet");
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/cbor/JacksonCborEncoder.java

@@ -0,0 +1,79 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.cbor;
+
+import java.util.Map;
+
+import org.jspecify.annotations.Nullable;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+import tools.jackson.databind.cfg.MapperBuilder;
+import tools.jackson.dataformat.cbor.CBORMapper;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DataBufferFactory;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.AbstractJacksonEncoder;
+import org.springframework.util.MimeType;
+
+/**
+ * Encode from an {@code Object} to bytes of CBOR objects using Jackson 3.x.
+ * Stream encoding is not supported yet.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ * @see JacksonCborDecoder
+ * @see <a href="https://github.com/spring-projects/spring-framework/issues/20513">Add CBOR support to WebFlux</a>
+ */
+public class JacksonCborEncoder extends AbstractJacksonEncoder {
+
+	/**
+	 * Construct a new instance with a {@link CBORMapper} customized with the
+	 * {@link tools.jackson.databind.JacksonModule}s found by
+	 * {@link MapperBuilder#findModules(ClassLoader)}.
+	 */
+	public JacksonCborEncoder() {
+		super(CBORMapper.builder(), MediaType.APPLICATION_CBOR);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link CBORMapper}.
+	 * @see CBORMapper#builder()
+	 * @see MapperBuilder#findAndAddModules(ClassLoader)
+	 */
+	public JacksonCborEncoder(CBORMapper mapper) {
+		super(mapper, MediaType.APPLICATION_CBOR);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link CBORMapper} and {@link MimeType}s.
+	 * @see CBORMapper#builder()
+	 * @see MapperBuilder#findAndAddModules(ClassLoader)
+	 */
+	public JacksonCborEncoder(CBORMapper mapper, MimeType... mimeTypes) {
+		super(mapper, mimeTypes);
+	}
+
+
+	@Override
+	public Flux<DataBuffer> encode(Publisher<?> inputStream, DataBufferFactory bufferFactory, ResolvableType elementType,
+			@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
+		throw new UnsupportedOperationException("Does not support stream encoding yet");
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/json/Jackson2Tokenizer.java

@@ -44,7 +44,7 @@ import org.springframework.core.io.buffer.DataBufferUtils;
 /**
  * {@link Function} to transform a JSON stream of arbitrary size, byte array
  * chunks into a {@code Flux<TokenBuffer>} where each token buffer is a
- * well-formed JSON object.
+ * well-formed JSON object with Jackson 2.x.
  *
  * @author Arjen Poutsma
  * @author Rossen Stoyanchev

spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonDecoder.java

@@ -0,0 +1,114 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.json;
+
+import java.nio.CharBuffer;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.Map;
+
+import org.jspecify.annotations.Nullable;
+import org.reactivestreams.Publisher;
+import reactor.core.publisher.Flux;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.cfg.MapperBuilder;
+import tools.jackson.databind.json.JsonMapper;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.codec.CharBufferDecoder;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DefaultDataBufferFactory;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.AbstractJacksonDecoder;
+import org.springframework.util.MimeType;
+import org.springframework.util.MimeTypeUtils;
+
+/**
+ * Decode a byte stream into JSON and convert to Object's with
+ * <a href="https://github.com/FasterXML/jackson">Jackson 3.x</a>
+ * leveraging non-blocking parsing.
+ *
+ * <p>The default constructor loads {@link tools.jackson.databind.JacksonModule}s
+ * found by {@link MapperBuilder#findModules(ClassLoader)}.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ * @see JacksonJsonEncoder
+ */
+public class JacksonJsonDecoder extends AbstractJacksonDecoder {
+
+	private static final CharBufferDecoder CHAR_BUFFER_DECODER = CharBufferDecoder.textPlainOnly(Arrays.asList(",", "\n"), false);
+
+	private static final ResolvableType CHAR_BUFFER_TYPE = ResolvableType.forClass(CharBuffer.class);
+
+	private static final MimeType[] DEFAULT_JSON_MIME_TYPES = new MimeType[] {
+			MediaType.APPLICATION_JSON,
+			new MediaType("application", "*+json"),
+			MediaType.APPLICATION_NDJSON
+	};
+
+
+	/**
+	 * Construct a new instance with a {@link JsonMapper} customized with the
+	 * {@link tools.jackson.databind.JacksonModule}s found by
+	 * {@link MapperBuilder#findModules(ClassLoader)}.
+	 */
+	public JacksonJsonDecoder() {
+		super(JsonMapper.builder(), DEFAULT_JSON_MIME_TYPES);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link ObjectMapper}.
+	 * @see JsonMapper#builder()
+	 * @see MapperBuilder#findModules(ClassLoader)
+	 */
+	public JacksonJsonDecoder(ObjectMapper mapper) {
+		this(mapper, DEFAULT_JSON_MIME_TYPES);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link ObjectMapper} and {@link MimeType}s.
+	 * @see JsonMapper#builder()
+	 * @see MapperBuilder#findModules(ClassLoader)
+	 */
+	public JacksonJsonDecoder(ObjectMapper mapper, MimeType... mimeTypes) {
+		super(mapper, mimeTypes);
+	}
+
+	@Override
+	protected Flux<DataBuffer> processInput(Publisher<DataBuffer> input, ResolvableType elementType,
+			@Nullable MimeType mimeType, @Nullable Map<String, Object> hints) {
+
+		Flux<DataBuffer> flux = Flux.from(input);
+		if (mimeType == null) {
+			return flux;
+		}
+
+		// Jackson asynchronous parser only supports UTF-8
+		Charset charset = mimeType.getCharset();
+		if (charset == null || StandardCharsets.UTF_8.equals(charset) || StandardCharsets.US_ASCII.equals(charset)) {
+			return flux;
+		}
+
+		// Re-encode as UTF-8.
+		MimeType textMimeType = new MimeType(MimeTypeUtils.TEXT_PLAIN, charset);
+		Flux<CharBuffer> decoded = CHAR_BUFFER_DECODER.decode(input, CHAR_BUFFER_TYPE, textMimeType, null);
+		return decoded.map(charBuffer -> DefaultDataBufferFactory.sharedInstance.wrap(StandardCharsets.UTF_8.encode(charBuffer)));
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/json/JacksonJsonEncoder.java

@@ -0,0 +1,125 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.json;
+
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import org.jspecify.annotations.Nullable;
+import reactor.core.publisher.Flux;
+import tools.jackson.core.PrettyPrinter;
+import tools.jackson.core.util.DefaultIndenter;
+import tools.jackson.core.util.DefaultPrettyPrinter;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.ObjectWriter;
+import tools.jackson.databind.SerializationFeature;
+import tools.jackson.databind.cfg.MapperBuilder;
+import tools.jackson.databind.json.JsonMapper;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.http.MediaType;
+import org.springframework.http.ProblemDetail;
+import org.springframework.http.codec.AbstractJacksonEncoder;
+import org.springframework.http.converter.json.ProblemDetailJacksonMixin;
+import org.springframework.util.MimeType;
+
+/**
+ * Encode from an {@code Object} stream to a byte stream of JSON objects using
+ * <a href="https://github.com/FasterXML/jackson">Jackson 3.x</a>. For non-streaming
+ * use cases, {@link Flux} elements are collected into a {@link List} before
+ * serialization for performance reason.
+ *
+ * <p>The default constructor loads {@link tools.jackson.databind.JacksonModule}s
+ * found by {@link MapperBuilder#findModules(ClassLoader)}.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ * @see JacksonJsonDecoder
+ */
+public class JacksonJsonEncoder extends AbstractJacksonEncoder {
+
+	private static final List<MimeType> problemDetailMimeTypes =
+			Collections.singletonList(MediaType.APPLICATION_PROBLEM_JSON);
+
+	private static final MimeType[] DEFAULT_JSON_MIME_TYPES = new MimeType[] {
+			MediaType.APPLICATION_JSON,
+			new MediaType("application", "*+json"),
+			MediaType.APPLICATION_NDJSON
+	};
+
+
+	private final @Nullable PrettyPrinter ssePrettyPrinter;
+
+
+	/**
+	 * Construct a new instance with a {@link JsonMapper} customized with the
+	 * {@link tools.jackson.databind.JacksonModule}s found by
+	 * {@link MapperBuilder#findModules(ClassLoader)} and
+	 * {@link ProblemDetailJacksonMixin}.
+	 */
+	public JacksonJsonEncoder() {
+		super(JsonMapper.builder().addMixIn(ProblemDetail.class, ProblemDetailJacksonMixin.class),
+				DEFAULT_JSON_MIME_TYPES);
+		setStreamingMediaTypes(List.of(MediaType.APPLICATION_NDJSON));
+		this.ssePrettyPrinter = initSsePrettyPrinter();
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link ObjectMapper}.
+	 * @see JsonMapper#builder()
+	 * @see MapperBuilder#findModules(ClassLoader)
+	 */
+	public JacksonJsonEncoder(ObjectMapper mapper) {
+		this(mapper, DEFAULT_JSON_MIME_TYPES);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link ObjectMapper} and
+	 * {@link MimeType}s.
+	 * @see JsonMapper#builder()
+	 * @see MapperBuilder#findModules(ClassLoader)
+	 */
+	public JacksonJsonEncoder(ObjectMapper mapper, MimeType... mimeTypes) {
+		super(mapper, mimeTypes);
+		setStreamingMediaTypes(List.of(MediaType.APPLICATION_NDJSON));
+		this.ssePrettyPrinter = initSsePrettyPrinter();
+	}
+
+	private static PrettyPrinter initSsePrettyPrinter() {
+		DefaultPrettyPrinter printer = new DefaultPrettyPrinter();
+		printer.indentObjectsWith(new DefaultIndenter("  ", "\ndata:"));
+		return printer;
+	}
+
+
+	@Override
+	protected List<MimeType> getMediaTypesForProblemDetail() {
+		return problemDetailMimeTypes;
+	}
+
+	@Override
+	protected ObjectWriter customizeWriter(ObjectWriter writer, @Nullable MimeType mimeType,
+			ResolvableType elementType, @Nullable Map<String, Object> hints) {
+
+		return (this.ssePrettyPrinter != null &&
+				MediaType.TEXT_EVENT_STREAM.isCompatibleWith(mimeType) &&
+				writer.getConfig().isEnabled(SerializationFeature.INDENT_OUTPUT) ?
+				writer.with(this.ssePrettyPrinter) : writer);
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/smile/JacksonSmileDecoder.java

@@ -0,0 +1,69 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.smile;
+
+import tools.jackson.databind.cfg.MapperBuilder;
+import tools.jackson.dataformat.smile.SmileMapper;
+
+import org.springframework.http.codec.AbstractJacksonDecoder;
+import org.springframework.util.MimeType;
+
+/**
+ * Decode a byte stream into Smile and convert to Object's with Jackson 3.x,
+ * leveraging non-blocking parsing.
+ *
+ * <p>The default constructor loads {@link tools.jackson.databind.JacksonModule}s
+ * found by {@link MapperBuilder#findModules(ClassLoader)}.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ * @see JacksonSmileEncoder
+ */
+public class JacksonSmileDecoder extends AbstractJacksonDecoder {
+
+	private static final MimeType[] DEFAULT_SMILE_MIME_TYPES = new MimeType[] {
+					new MimeType("application", "x-jackson-smile"),
+					new MimeType("application", "*+x-jackson-smile")};
+
+	/**
+	 * Construct a new instance with a {@link SmileMapper} customized with the
+	 * {@link tools.jackson.databind.JacksonModule}s found by
+	 * {@link MapperBuilder#findModules(ClassLoader)}.
+	 */
+	public JacksonSmileDecoder() {
+		super(SmileMapper.builder(), DEFAULT_SMILE_MIME_TYPES);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link SmileMapper}.
+	 * @see SmileMapper#builder()
+	 * @see MapperBuilder#findAndAddModules(ClassLoader)
+	 */
+	public JacksonSmileDecoder(SmileMapper mapper) {
+		this(mapper, DEFAULT_SMILE_MIME_TYPES);
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link SmileMapper} and {@link MimeType}s.
+	 * @see SmileMapper#builder()
+	 * @see MapperBuilder#findAndAddModules(ClassLoader)
+	 */
+	public JacksonSmileDecoder(SmileMapper mapper, MimeType... mimeTypes) {
+		super(mapper, mimeTypes);
+	}
+
+}

spring-web/src/main/java/org/springframework/http/codec/smile/JacksonSmileEncoder.java

@@ -0,0 +1,101 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.smile;
+
+import java.util.Collections;
+import java.util.List;
+
+import org.jspecify.annotations.Nullable;
+import reactor.core.publisher.Flux;
+import tools.jackson.databind.cfg.MapperBuilder;
+import tools.jackson.dataformat.smile.SmileMapper;
+
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.AbstractJacksonEncoder;
+import org.springframework.util.MimeType;
+
+/**
+ * Encode from an {@code Object} stream to a byte stream of Smile objects using Jackson 3.x.
+ * For non-streaming use cases, {@link Flux} elements are collected into a {@link List}
+ * before serialization for performance reason.
+ *
+ * <p>The default constructor loads {@link tools.jackson.databind.JacksonModule}s
+ * found by {@link MapperBuilder#findModules(ClassLoader)}.
+ *
+ * @author Sebastien Deleuze
+ * @since 7.0
+ * @see JacksonSmileDecoder
+ */
+public class JacksonSmileEncoder extends AbstractJacksonEncoder {
+
+	private static final MimeType[] DEFAULT_SMILE_MIME_TYPES = new MimeType[] {
+			new MimeType("application", "x-jackson-smile"),
+			new MimeType("application", "*+x-jackson-smile")};
+
+	private static final MediaType DEFAULT_SMILE_STREAMING_MEDIA_TYPE =
+			new MediaType("application", "stream+x-jackson-smile");
+
+	private static final byte[] STREAM_SEPARATOR = new byte[0];
+
+
+	/**
+	 * Construct a new instance with a {@link SmileMapper} customized with the
+	 * {@link tools.jackson.databind.JacksonModule}s found by
+	 * {@link MapperBuilder#findModules(ClassLoader)}.
+	 */
+	public JacksonSmileEncoder() {
+		super(SmileMapper.builder(), DEFAULT_SMILE_MIME_TYPES);
+		setStreamingMediaTypes(Collections.singletonList(DEFAULT_SMILE_STREAMING_MEDIA_TYPE));
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link SmileMapper}.
+	 * @see SmileMapper#builder()
+	 * @see MapperBuilder#findAndAddModules(ClassLoader)
+	 */
+	public JacksonSmileEncoder(SmileMapper mapper) {
+		super(mapper, DEFAULT_SMILE_MIME_TYPES);
+		setStreamingMediaTypes(Collections.singletonList(DEFAULT_SMILE_STREAMING_MEDIA_TYPE));
+	}
+
+	/**
+	 * Construct a new instance with the provided {@link SmileMapper} and {@link MimeType}s.
+	 * @see SmileMapper#builder()
+	 * @see MapperBuilder#findAndAddModules(ClassLoader)
+	 */
+	public JacksonSmileEncoder(SmileMapper mapper, MimeType... mimeTypes) {
+		super(mapper, mimeTypes);
+		setStreamingMediaTypes(Collections.singletonList(DEFAULT_SMILE_STREAMING_MEDIA_TYPE));
+	}
+
+
+	/**
+	 * Return the separator to use for the given mime type.
+	 * <p>By default, this method returns a single byte 0 if the given
+	 * mime type is one of the configured {@link #setStreamingMediaTypes(List)
+	 * streaming} mime types.
+	 */
+	@Override
+	protected byte @Nullable [] getStreamingMediaTypeSeparator(@Nullable MimeType mimeType) {
+		for (MediaType streamingMediaType : getStreamingMediaTypes()) {
+			if (streamingMediaType.isCompatibleWith(mimeType)) {
+				return STREAM_SEPARATOR;
+			}
+		}
+		return null;
+	}
+}

spring-web/src/main/java/org/springframework/http/codec/smile/package-info.java

@@ -0,0 +1,7 @@
+/**
+ * Provides an encoder and a decoder for the Smile data format ("binary JSON").
+ */
+@NullMarked
+package org.springframework.http.codec.smile;
+
+import org.jspecify.annotations.NullMarked;

spring-web/src/main/java/org/springframework/http/codec/support/BaseDefaultCodecs.java

@@ -39,6 +39,7 @@ import org.springframework.core.codec.NettyByteBufDecoder;
 import org.springframework.core.codec.NettyByteBufEncoder;
 import org.springframework.core.codec.ResourceDecoder;
 import org.springframework.core.codec.StringDecoder;
+import org.springframework.http.codec.AbstractJacksonDecoder;
 import org.springframework.http.codec.CodecConfigurer;
 import org.springframework.http.codec.DecoderHttpMessageReader;
 import org.springframework.http.codec.EncoderHttpMessageWriter;
@@ -57,6 +58,8 @@ import org.springframework.http.codec.json.Jackson2JsonDecoder;
 import org.springframework.http.codec.json.Jackson2JsonEncoder;
 import org.springframework.http.codec.json.Jackson2SmileDecoder;
 import org.springframework.http.codec.json.Jackson2SmileEncoder;
+import org.springframework.http.codec.json.JacksonJsonDecoder;
+import org.springframework.http.codec.json.JacksonJsonEncoder;
 import org.springframework.http.codec.json.KotlinSerializationJsonDecoder;
 import org.springframework.http.codec.json.KotlinSerializationJsonEncoder;
 import org.springframework.http.codec.multipart.DefaultPartHttpMessageReader;
@@ -70,6 +73,8 @@ import org.springframework.http.codec.protobuf.KotlinSerializationProtobufEncode
 import org.springframework.http.codec.protobuf.ProtobufDecoder;
 import org.springframework.http.codec.protobuf.ProtobufEncoder;
 import org.springframework.http.codec.protobuf.ProtobufHttpMessageWriter;
+import org.springframework.http.codec.smile.JacksonSmileDecoder;
+import org.springframework.http.codec.smile.JacksonSmileEncoder;
 import org.springframework.http.codec.xml.Jaxb2XmlDecoder;
 import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
 import org.springframework.util.ClassUtils;
@@ -84,8 +89,12 @@ import org.springframework.util.ObjectUtils;
  */
 class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigurer.DefaultCodecConfig {
 
+	static final boolean jacksonPresent;
+
 	static final boolean jackson2Present;
 
+	private static final boolean jacksonSmilePresent;
+
 	private static final boolean jackson2SmilePresent;
 
 	private static final boolean jaxb2Present;
@@ -102,9 +111,11 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 
 	static {
 		ClassLoader classLoader = BaseCodecConfigurer.class.getClassLoader();
+		jacksonPresent = ClassUtils.isPresent("tools.jackson.databind.ObjectMapper", classLoader);
 		jackson2Present = ClassUtils.isPresent("com.fasterxml.jackson.databind.ObjectMapper", classLoader) &&
 						ClassUtils.isPresent("com.fasterxml.jackson.core.JsonGenerator", classLoader);
-		jackson2SmilePresent = ClassUtils.isPresent("com.fasterxml.jackson.dataformat.smile.SmileFactory", classLoader);
+		jacksonSmilePresent = jacksonPresent && ClassUtils.isPresent("tools.jackson.dataformat.smile.SmileMapper", classLoader);
+		jackson2SmilePresent = jackson2Present && ClassUtils.isPresent("com.fasterxml.jackson.dataformat.smile.SmileFactory", classLoader);
 		jaxb2Present = ClassUtils.isPresent("jakarta.xml.bind.Binder", classLoader);
 		protobufPresent = ClassUtils.isPresent("com.google.protobuf.Message", classLoader);
 		nettyByteBufPresent = ClassUtils.isPresent("io.netty.buffer.ByteBuf", classLoader);
@@ -114,12 +125,20 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 	}
 
 
+	private @Nullable Decoder<?> jacksonJsonDecoder;
+
 	private @Nullable Decoder<?> jackson2JsonDecoder;
 
+	private @Nullable Encoder<?> jacksonJsonEncoder;
+
 	private @Nullable Encoder<?> jackson2JsonEncoder;
 
+	private @Nullable Encoder<?> jacksonSmileEncoder;
+
 	private @Nullable Encoder<?> jackson2SmileEncoder;
 
+	private @Nullable Decoder<?> jacksonSmileDecoder;
+
 	private @Nullable Decoder<?> jackson2SmileDecoder;
 
 	private @Nullable Decoder<?> protobufDecoder;
@@ -195,9 +214,13 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 	 * Create a deep copy of the given {@link BaseDefaultCodecs}.
 	 */
 	protected BaseDefaultCodecs(BaseDefaultCodecs other) {
+		this.jacksonJsonDecoder = other.jacksonJsonDecoder;
 		this.jackson2JsonDecoder = other.jackson2JsonDecoder;
+		this.jacksonJsonEncoder = other.jacksonJsonEncoder;
 		this.jackson2JsonEncoder = other.jackson2JsonEncoder;
+		this.jacksonSmileDecoder = other.jacksonSmileDecoder;
 		this.jackson2SmileDecoder = other.jackson2SmileDecoder;
+		this.jacksonSmileEncoder = other.jacksonSmileEncoder;
 		this.jackson2SmileEncoder = other.jackson2SmileEncoder;
 		this.protobufDecoder = other.protobufDecoder;
 		this.protobufEncoder = other.protobufEncoder;
@@ -222,12 +245,25 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 		this.objectWriters.addAll(other.objectWriters);
 	}
 
+	@Override
+	public void jacksonJsonDecoder(Decoder<?> decoder) {
+		this.jacksonJsonDecoder = decoder;
+		initObjectReaders();
+	}
+
 	@Override
 	public void jackson2JsonDecoder(Decoder<?> decoder) {
 		this.jackson2JsonDecoder = decoder;
 		initObjectReaders();
 	}
 
+	@Override
+	public void jacksonJsonEncoder(Encoder<?> encoder) {
+		this.jacksonJsonEncoder = encoder;
+		initObjectWriters();
+		initTypedWriters();
+	}
+
 	@Override
 	public void jackson2JsonEncoder(Encoder<?> encoder) {
 		this.jackson2JsonEncoder = encoder;
@@ -235,12 +271,25 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 		initTypedWriters();
 	}
 
+	@Override
+	public void jacksonSmileDecoder(Decoder<?> decoder) {
+		this.jacksonSmileDecoder = decoder;
+		initObjectReaders();
+	}
+
 	@Override
 	public void jackson2SmileDecoder(Decoder<?> decoder) {
 		this.jackson2SmileDecoder = decoder;
 		initObjectReaders();
 	}
 
+	@Override
+	public void jacksonSmileEncoder(Encoder<?> encoder) {
+		this.jacksonSmileEncoder = encoder;
+		initObjectWriters();
+		initTypedWriters();
+	}
+
 	@Override
 	public void jackson2SmileEncoder(Encoder<?> encoder) {
 		this.jackson2SmileEncoder = encoder;
@@ -476,6 +525,11 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 					kotlinSerializationProtobufDec.setMaxInMemorySize(size);
 				}
 			}
+			if (jacksonPresent) {
+				if (codec instanceof AbstractJacksonDecoder abstractJacksonDecoder) {
+					abstractJacksonDecoder.setMaxInMemorySize(size);
+				}
+			}
 			if (jackson2Present) {
 				if (codec instanceof AbstractJackson2Decoder abstractJackson2Decoder) {
 					abstractJackson2Decoder.setMaxInMemorySize(size);
@@ -574,13 +628,20 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 							(KotlinSerializationProtobufDecoder) this.kotlinSerializationProtobufDecoder :
 							new KotlinSerializationProtobufDecoder()));
 		}
-		if (jackson2Present) {
+		if (jacksonPresent) {
+			addCodec(this.objectReaders, new DecoderHttpMessageReader<>(getJacksonJsonDecoder()));
+		}
+		else if (jackson2Present) {
 			addCodec(this.objectReaders, new DecoderHttpMessageReader<>(getJackson2JsonDecoder()));
 		}
 		else if (kotlinSerializationJsonPresent) {
 			addCodec(this.objectReaders, new DecoderHttpMessageReader<>(getKotlinSerializationJsonDecoder()));
 		}
-		if (jackson2SmilePresent) {
+		if (jacksonSmilePresent) {
+			addCodec(this.objectReaders, new DecoderHttpMessageReader<>(this.jacksonSmileDecoder != null ?
+					(JacksonSmileDecoder) this.jacksonSmileDecoder : new JacksonSmileDecoder()));
+		}
+		else if (jackson2SmilePresent) {
 			addCodec(this.objectReaders, new DecoderHttpMessageReader<>(this.jackson2SmileDecoder != null ?
 					(Jackson2SmileDecoder) this.jackson2SmileDecoder : new Jackson2SmileDecoder()));
 		}
@@ -711,13 +772,20 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 					(KotlinSerializationProtobufEncoder) this.kotlinSerializationProtobufEncoder :
 					new KotlinSerializationProtobufEncoder()));
 		}
-		if (jackson2Present) {
+		if (jacksonPresent) {
+			addCodec(writers, new EncoderHttpMessageWriter<>(getJacksonJsonEncoder()));
+		}
+		else if (jackson2Present) {
 			addCodec(writers, new EncoderHttpMessageWriter<>(getJackson2JsonEncoder()));
 		}
 		else if (kotlinSerializationJsonPresent) {
 			addCodec(writers, new EncoderHttpMessageWriter<>(getKotlinSerializationJsonEncoder()));
 		}
-		if (jackson2SmilePresent) {
+		if (jacksonSmilePresent) {
+			addCodec(writers, new EncoderHttpMessageWriter<>(this.jacksonSmileEncoder != null ?
+					(JacksonSmileEncoder) this.jacksonSmileEncoder : new JacksonSmileEncoder()));
+		}
+		else if (jackson2SmilePresent) {
 			addCodec(writers, new EncoderHttpMessageWriter<>(this.jackson2SmileEncoder != null ?
 					(Jackson2SmileEncoder) this.jackson2SmileEncoder : new Jackson2SmileEncoder()));
 		}
@@ -764,6 +832,13 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 
 	// Accessors for use in subclasses...
 
+	protected Decoder<?> getJacksonJsonDecoder() {
+		if (this.jacksonJsonDecoder == null) {
+			this.jacksonJsonDecoder = new JacksonJsonDecoder();
+		}
+		return this.jacksonJsonDecoder;
+	}
+
 	protected Decoder<?> getJackson2JsonDecoder() {
 		if (this.jackson2JsonDecoder == null) {
 			this.jackson2JsonDecoder = new Jackson2JsonDecoder();
@@ -771,6 +846,13 @@ class BaseDefaultCodecs implements CodecConfigurer.DefaultCodecs, CodecConfigure
 		return this.jackson2JsonDecoder;
 	}
 
+	protected Encoder<?> getJacksonJsonEncoder() {
+		if (this.jacksonJsonEncoder == null) {
+			this.jacksonJsonEncoder = new JacksonJsonEncoder();
+		}
+		return this.jacksonJsonEncoder;
+	}
+
 	protected Encoder<?> getJackson2JsonEncoder() {
 		if (this.jackson2JsonEncoder == null) {
 			this.jackson2JsonEncoder = new Jackson2JsonEncoder();

spring-web/src/main/java/org/springframework/http/codec/support/ClientDefaultCodecsImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -53,6 +53,7 @@ class ClientDefaultCodecsImpl extends BaseDefaultCodecs implements ClientCodecCo
 	protected void extendObjectReaders(List<HttpMessageReader<?>> objectReaders) {
 
 		Decoder<?> decoder = (this.sseDecoder != null ? this.sseDecoder :
+				jacksonPresent ? getJacksonJsonDecoder() :
 				jackson2Present ? getJackson2JsonDecoder() :
 				kotlinSerializationJsonPresent ? getKotlinSerializationJsonDecoder() :
 				null);

spring-web/src/main/java/org/springframework/http/codec/support/ServerDefaultCodecsImpl.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -57,6 +57,7 @@ class ServerDefaultCodecsImpl extends BaseDefaultCodecs implements ServerCodecCo
 
 	private @Nullable Encoder<?> getSseEncoder() {
 		return this.sseEncoder != null ? this.sseEncoder :
+				jacksonPresent ? getJacksonJsonEncoder() :
 				jackson2Present ? getJackson2JsonEncoder() :
 				kotlinSerializationJsonPresent ? getKotlinSerializationJsonEncoder() :
 				null;

spring-web/src/test/java/org/springframework/http/codec/JacksonTokenizerTests.java

@@ -0,0 +1,376 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec;
+
+import java.nio.charset.StandardCharsets;
+import java.util.List;
+
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.ByteBufAllocator;
+import io.netty.buffer.CompositeByteBuf;
+import io.netty.buffer.UnpooledByteBufAllocator;
+import org.json.JSONException;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.skyscreamer.jsonassert.JSONAssert;
+import reactor.core.publisher.Flux;
+import reactor.test.StepVerifier;
+import tools.jackson.core.JsonParser;
+import tools.jackson.core.JsonToken;
+import tools.jackson.core.TreeNode;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.json.JsonMapper;
+import tools.jackson.databind.util.TokenBuffer;
+
+import org.springframework.core.codec.DecodingException;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DataBufferLimitException;
+import org.springframework.core.io.buffer.NettyDataBufferFactory;
+import org.springframework.core.testfixture.io.buffer.AbstractLeakCheckingTests;
+
+import static java.util.Arrays.asList;
+import static java.util.Collections.singletonList;
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * Tests for {@link JacksonTokenizer}.
+ *
+ * @author Sebastien Deleuze
+ */
+class JacksonTokenizerTests extends AbstractLeakCheckingTests {
+
+	private ObjectMapper objectMapper;
+
+
+	@BeforeEach
+	void createParser() {
+		this.objectMapper = JsonMapper.builder().build();
+	}
+
+
+	@Test
+	void doNotTokenizeArrayElements() {
+		testTokenize(
+				singletonList("{\"foo\": \"foofoo\", \"bar\": \"barbar\"}"),
+				singletonList("{\"foo\": \"foofoo\", \"bar\": \"barbar\"}"), false);
+
+		testTokenize(
+				asList(
+						"{\"foo\": \"foofoo\"",
+						", \"bar\": \"barbar\"}"
+				),
+				singletonList("{\"foo\":\"foofoo\",\"bar\":\"barbar\"}"), false);
+
+		testTokenize(
+				singletonList("[{\"foo\": \"foofoo\", \"bar\": \"barbar\"},{\"foo\": \"foofoofoo\", \"bar\": \"barbarbar\"}]"),
+				singletonList("[{\"foo\": \"foofoo\", \"bar\": \"barbar\"},{\"foo\": \"foofoofoo\", \"bar\": \"barbarbar\"}]"),
+				false);
+
+		testTokenize(
+				singletonList("[{\"foo\": \"bar\"},{\"foo\": \"baz\"}]"),
+				singletonList("[{\"foo\": \"bar\"},{\"foo\": \"baz\"}]"), false);
+
+		testTokenize(
+				asList(
+						"[{\"foo\": \"foofoo\", \"bar\"",
+						": \"barbar\"},{\"foo\": \"foofoofoo\", \"bar\": \"barbarbar\"}]"
+				),
+				singletonList("[{\"foo\": \"foofoo\", \"bar\": \"barbar\"},{\"foo\": \"foofoofoo\", \"bar\": \"barbarbar\"}]"),
+				false);
+
+		testTokenize(
+				asList(
+						"[",
+						"{\"id\":1,\"name\":\"Robert\"}", ",",
+						"{\"id\":2,\"name\":\"Raide\"}", ",",
+						"{\"id\":3,\"name\":\"Ford\"}", "]"
+				),
+				singletonList("[{\"id\":1,\"name\":\"Robert\"},{\"id\":2,\"name\":\"Raide\"},{\"id\":3,\"name\":\"Ford\"}]"),
+				false);
+
+		// SPR-16166: top-level JSON values
+		testTokenize(asList("\"foo", "bar\""), singletonList("\"foobar\""), false);
+		testTokenize(asList("12", "34"), singletonList("1234"), false);
+		testTokenize(asList("12.", "34"), singletonList("12.34"), false);
+
+		// note that we do not test for null, true, or false, which are also valid top-level values,
+		// but are unsupported by JSONassert
+	}
+
+	@Test
+	void tokenizeArrayElements() {
+		testTokenize(
+				singletonList("{\"foo\": \"foofoo\", \"bar\": \"barbar\"}"),
+				singletonList("{\"foo\": \"foofoo\", \"bar\": \"barbar\"}"), true);
+
+		testTokenize(
+				asList(
+						"{\"foo\": \"foofoo\"",
+						", \"bar\": \"barbar\"}"
+				),
+				singletonList("{\"foo\":\"foofoo\",\"bar\":\"barbar\"}"), true);
+
+		testTokenize(
+				singletonList("[{\"foo\": \"foofoo\", \"bar\": \"barbar\"},{\"foo\": \"foofoofoo\", \"bar\": \"barbarbar\"}]"),
+				asList(
+						"{\"foo\": \"foofoo\", \"bar\": \"barbar\"}",
+						"{\"foo\": \"foofoofoo\", \"bar\": \"barbarbar\"}"
+				),
+				true);
+
+		testTokenize(
+				singletonList("[{\"foo\": \"bar\"},{\"foo\": \"baz\"}]"),
+				asList(
+						"{\"foo\": \"bar\"}",
+						"{\"foo\": \"baz\"}"
+				),
+				true);
+
+		// SPR-15803: nested array
+		testTokenize(
+				singletonList("[" +
+						"{\"id\":\"0\",\"start\":[-999999999,1,1],\"end\":[999999999,12,31]}," +
+						"{\"id\":\"1\",\"start\":[-999999999,1,1],\"end\":[999999999,12,31]}," +
+						"{\"id\":\"2\",\"start\":[-999999999,1,1],\"end\":[999999999,12,31]}" +
+						"]"),
+				asList(
+						"{\"id\":\"0\",\"start\":[-999999999,1,1],\"end\":[999999999,12,31]}",
+						"{\"id\":\"1\",\"start\":[-999999999,1,1],\"end\":[999999999,12,31]}",
+						"{\"id\":\"2\",\"start\":[-999999999,1,1],\"end\":[999999999,12,31]}"
+				),
+				true);
+
+		// SPR-15803: nested array, no top-level array
+		testTokenize(
+				singletonList("{\"speakerIds\":[\"tastapod\"],\"language\":\"ENGLISH\"}"),
+				singletonList("{\"speakerIds\":[\"tastapod\"],\"language\":\"ENGLISH\"}"), true);
+
+		testTokenize(
+				asList(
+						"[{\"foo\": \"foofoo\", \"bar\"",
+						": \"barbar\"},{\"foo\": \"foofoofoo\", \"bar\": \"barbarbar\"}]"
+				),
+				asList(
+						"{\"foo\": \"foofoo\", \"bar\": \"barbar\"}",
+						"{\"foo\": \"foofoofoo\", \"bar\": \"barbarbar\"}"), true);
+
+		testTokenize(
+				asList(
+						"[",
+						"{\"id\":1,\"name\":\"Robert\"}",
+						",",
+						"{\"id\":2,\"name\":\"Raide\"}",
+						",",
+						"{\"id\":3,\"name\":\"Ford\"}",
+						"]"
+				),
+				asList(
+						"{\"id\":1,\"name\":\"Robert\"}",
+						"{\"id\":2,\"name\":\"Raide\"}",
+						"{\"id\":3,\"name\":\"Ford\"}"
+				),
+				true);
+
+		// SPR-16166: top-level JSON values
+		testTokenize(asList("\"foo", "bar\""), singletonList("\"foobar\""), true);
+		testTokenize(asList("12", "34"), singletonList("1234"), true);
+		testTokenize(asList("12.", "34"), singletonList("12.34"), true);
+
+		// SPR-16407
+		testTokenize(asList("[1", ",2,", "3]"), asList("1", "2", "3"), true);
+	}
+
+	@Test
+	void tokenizeStream() {
+
+		// NDJSON (Newline Delimited JSON), JSON Lines
+		testTokenize(
+				asList(
+						"{\"id\":1,\"name\":\"Robert\"}",
+						"\n",
+						"{\"id\":2,\"name\":\"Raide\"}",
+						"\n",
+						"{\"id\":3,\"name\":\"Ford\"}"
+				),
+				asList(
+						"{\"id\":1,\"name\":\"Robert\"}",
+						"{\"id\":2,\"name\":\"Raide\"}",
+						"{\"id\":3,\"name\":\"Ford\"}"
+				),
+				true);
+
+		// JSON Sequence with newline separator
+		testTokenize(
+				asList(
+						"\n",
+						"{\"id\":1,\"name\":\"Robert\"}",
+						"\n",
+						"{\"id\":2,\"name\":\"Raide\"}",
+						"\n",
+						"{\"id\":3,\"name\":\"Ford\"}"
+				),
+				asList(
+						"{\"id\":1,\"name\":\"Robert\"}",
+						"{\"id\":2,\"name\":\"Raide\"}",
+						"{\"id\":3,\"name\":\"Ford\"}"
+				),
+				true);
+	}
+
+	private void testTokenize(List<String> input, List<String> output, boolean tokenize) {
+		StepVerifier.FirstStep<String> builder = StepVerifier.create(decode(input, tokenize, -1));
+		output.forEach(expected -> builder.assertNext(actual -> {
+			try {
+				JSONAssert.assertEquals(expected, actual, true);
+			}
+			catch (JSONException ex) {
+				throw new RuntimeException(ex);
+			}
+		}));
+		builder.verifyComplete();
+	}
+
+	@Test
+	void testLimit() {
+		List<String> source = asList(
+				"[",
+				"{", "\"id\":1,\"name\":\"Dan\"", "},",
+				"{", "\"id\":2,\"name\":\"Ron\"", "},",
+				"{", "\"id\":3,\"name\":\"Bartholomew\"", "}",
+				"]"
+		);
+
+		String expected = String.join("", source);
+		int maxInMemorySize = expected.length();
+
+		StepVerifier.create(decode(source, false, maxInMemorySize))
+				.expectNext(expected)
+				.verifyComplete();
+
+		StepVerifier.create(decode(source, false, maxInMemorySize - 2))
+				.verifyError(DataBufferLimitException.class);
+	}
+
+	@Test
+	void testLimitTokenized() {
+
+		List<String> source = asList(
+				"[",
+				"{", "\"id\":1, \"name\":\"Dan\"", "},",
+				"{", "\"id\":2, \"name\":\"Ron\"", "},",
+				"{", "\"id\":3, \"name\":\"Bartholomew\"", "}",
+				"]"
+		);
+
+		String expected = "{\"id\":3,\"name\":\"Bartholomew\"}";
+		int maxInMemorySize = expected.length();
+
+		StepVerifier.create(decode(source, true, maxInMemorySize))
+				.expectNext("{\"id\":1,\"name\":\"Dan\"}")
+				.expectNext("{\"id\":2,\"name\":\"Ron\"}")
+				.expectNext(expected)
+				.verifyComplete();
+
+		StepVerifier.create(decode(source, true, maxInMemorySize - 1))
+				.expectNext("{\"id\":1,\"name\":\"Dan\"}")
+				.expectNext("{\"id\":2,\"name\":\"Ron\"}")
+				.verifyError(DataBufferLimitException.class);
+	}
+
+	@Test
+	void errorInStream() {
+		DataBuffer buffer = stringBuffer("{\"id\":1,\"name\":");
+		Flux<DataBuffer> source = Flux.just(buffer).concatWith(Flux.error(new RuntimeException()));
+		Flux<TokenBuffer> result = JacksonTokenizer.tokenize(source, this.objectMapper, true, false, -1);
+
+		StepVerifier.create(result)
+				.expectError(RuntimeException.class)
+				.verify();
+	}
+
+	@Test  // SPR-16521
+	public void jsonEOFExceptionIsWrappedAsDecodingError() {
+		Flux<DataBuffer> source = Flux.just(stringBuffer("{\"status\": \"noClosingQuote}"));
+		Flux<TokenBuffer> tokens = JacksonTokenizer.tokenize(source, this.objectMapper, false, false, -1);
+
+		StepVerifier.create(tokens)
+				.expectError(DecodingException.class)
+				.verify();
+	}
+
+	@Test
+	void useBigDecimalForFloats() {
+		Flux<DataBuffer> source = Flux.just(stringBuffer("1E+2"));
+		Flux<TokenBuffer> tokens = JacksonTokenizer.tokenize(
+				source, this.objectMapper, false, true, -1);
+
+		StepVerifier.create(tokens)
+				.assertNext(tokenBuffer -> {
+					JsonParser parser = tokenBuffer.asParser();
+					JsonToken token = parser.nextToken();
+					assertThat(token).isEqualTo(JsonToken.VALUE_NUMBER_FLOAT);
+					JsonParser.NumberType numberType = parser.getNumberType();
+					assertThat(numberType).isEqualTo(JsonParser.NumberType.BIG_DECIMAL);
+				})
+				.verifyComplete();
+	}
+
+	// gh-31747
+	@Test
+	void compositeNettyBuffer() {
+		ByteBufAllocator allocator = UnpooledByteBufAllocator.DEFAULT;
+		ByteBuf firstByteBuf = allocator.buffer();
+		firstByteBuf.writeBytes("{\"foo\": \"foofoo\"".getBytes(StandardCharsets.UTF_8));
+		ByteBuf secondBuf = allocator.buffer();
+		secondBuf.writeBytes(", \"bar\": \"barbar\"}".getBytes(StandardCharsets.UTF_8));
+		CompositeByteBuf composite = allocator.compositeBuffer();
+		composite.addComponent(true, firstByteBuf);
+		composite.addComponent(true, secondBuf);
+
+		NettyDataBufferFactory bufferFactory = new NettyDataBufferFactory(allocator);
+		Flux<DataBuffer> source = Flux.just(bufferFactory.wrap(composite));
+		Flux<TokenBuffer> tokens = JacksonTokenizer.tokenize(source, this.objectMapper, false, false, -1);
+
+		Flux<String> strings = tokens.map(this::tokenToString);
+
+		StepVerifier.create(strings)
+				.assertNext(s -> assertThat(s).isEqualTo("{\"foo\":\"foofoo\",\"bar\":\"barbar\"}"))
+				.verifyComplete();
+	}
+
+
+	private Flux<String> decode(List<String> source, boolean tokenize, int maxInMemorySize) {
+
+		Flux<TokenBuffer> tokens = JacksonTokenizer.tokenize(
+				Flux.fromIterable(source).map(this::stringBuffer), this.objectMapper, tokenize, false, maxInMemorySize);
+
+		return tokens.map(this::tokenToString);
+	}
+
+	private String tokenToString(TokenBuffer tokenBuffer) {
+		TreeNode root = this.objectMapper.readTree(tokenBuffer.asParser());
+		return this.objectMapper.writeValueAsString(root);
+	}
+
+	private DataBuffer stringBuffer(String value) {
+		byte[] bytes = value.getBytes(StandardCharsets.UTF_8);
+		DataBuffer buffer = this.bufferFactory.allocateBuffer(bytes.length);
+		buffer.write(bytes);
+		return buffer;
+	}
+
+}

spring-web/src/test/java/org/springframework/http/codec/ServerSentEventHttpMessageReaderTests.java

@@ -31,6 +31,7 @@ import org.springframework.core.io.buffer.DataBufferLimitException;
 import org.springframework.core.testfixture.io.buffer.AbstractLeakCheckingTests;
 import org.springframework.http.MediaType;
 import org.springframework.http.codec.json.Jackson2JsonDecoder;
+import org.springframework.http.codec.json.JacksonJsonDecoder;
 import org.springframework.web.testfixture.http.server.reactive.MockServerHttpRequest;
 import org.springframework.web.testfixture.xml.Pojo;
 
@@ -44,7 +45,7 @@ import static org.assertj.core.api.Assertions.assertThat;
  */
 class ServerSentEventHttpMessageReaderTests extends AbstractLeakCheckingTests {
 
-	private final Jackson2JsonDecoder jsonDecoder = new Jackson2JsonDecoder();
+	private final JacksonJsonDecoder jsonDecoder = new JacksonJsonDecoder();
 
 	private ServerSentEventHttpMessageReader reader = new ServerSentEventHttpMessageReader(this.jsonDecoder);
 

spring-web/src/test/java/org/springframework/http/codec/ServerSentEventHttpMessageWriterTests.java

@@ -22,19 +22,19 @@ import java.time.Duration;
 import java.util.Collections;
 import java.util.Map;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
 import org.reactivestreams.Publisher;
 import reactor.core.publisher.Flux;
 import reactor.core.publisher.Mono;
 import reactor.test.StepVerifier;
+import tools.jackson.databind.SerializationFeature;
+import tools.jackson.databind.json.JsonMapper;
 
 import org.springframework.core.ResolvableType;
 import org.springframework.core.io.buffer.DataBufferFactory;
 import org.springframework.core.io.buffer.DataBufferUtils;
 import org.springframework.core.testfixture.io.buffer.AbstractDataBufferAllocatingTests;
 import org.springframework.http.MediaType;
-import org.springframework.http.codec.json.Jackson2JsonEncoder;
+import org.springframework.http.codec.json.JacksonJsonEncoder;
-import org.springframework.http.converter.json.Jackson2ObjectMapperBuilder;
 import org.springframework.web.testfixture.http.server.reactive.MockServerHttpResponse;
 import org.springframework.web.testfixture.xml.Pojo;
 
@@ -54,7 +54,7 @@ class ServerSentEventHttpMessageWriterTests extends AbstractDataBufferAllocating
 	private static final Map<String, Object> HINTS = Collections.emptyMap();
 
 	private ServerSentEventHttpMessageWriter messageWriter =
-			new ServerSentEventHttpMessageWriter(new Jackson2JsonEncoder());
+			new ServerSentEventHttpMessageWriter(new JacksonJsonEncoder());
 
 
 	@ParameterizedDataBufferAllocatingTest
@@ -151,10 +151,10 @@ class ServerSentEventHttpMessageWriterTests extends AbstractDataBufferAllocating
 
 		StepVerifier.create(outputMessage.getBody())
 				.consumeNextWith(stringConsumer("data:"))
-				.consumeNextWith(stringConsumer("{\"foo\":\"foofoo\",\"bar\":\"barbar\"}"))
+				.consumeNextWith(stringConsumer("{\"bar\":\"barbar\",\"foo\":\"foofoo\"}"))
 				.consumeNextWith(stringConsumer("\n\n"))
 				.consumeNextWith(stringConsumer("data:"))
-				.consumeNextWith(stringConsumer("{\"foo\":\"foofoofoo\",\"bar\":\"barbarbar\"}"))
+				.consumeNextWith(stringConsumer("{\"bar\":\"barbarbar\",\"foo\":\"foofoofoo\"}"))
 				.consumeNextWith(stringConsumer("\n\n"))
 				.expectComplete()
 				.verify();
@@ -164,8 +164,8 @@ class ServerSentEventHttpMessageWriterTests extends AbstractDataBufferAllocating
 	void writePojoWithPrettyPrint(DataBufferFactory bufferFactory) {
 		super.bufferFactory = bufferFactory;
 
-		ObjectMapper mapper = Jackson2ObjectMapperBuilder.json().indentOutput(true).build();
+		JsonMapper mapper = JsonMapper.builder().enable(SerializationFeature.INDENT_OUTPUT).build();
-		this.messageWriter = new ServerSentEventHttpMessageWriter(new Jackson2JsonEncoder(mapper));
+		this.messageWriter = new ServerSentEventHttpMessageWriter(new JacksonJsonEncoder(mapper));
 
 		MockServerHttpResponse outputMessage = new MockServerHttpResponse(super.bufferFactory);
 		Flux<Pojo> source = Flux.just(new Pojo("foofoo", "barbar"), new Pojo("foofoofoo", "barbarbar"));
@@ -175,15 +175,15 @@ class ServerSentEventHttpMessageWriterTests extends AbstractDataBufferAllocating
 				.consumeNextWith(stringConsumer("data:"))
 				.consumeNextWith(stringConsumer("""
 						{
-						data:  "foo" : "foofoo",
+						data:  "bar" : "barbar",
-						data:  "bar" : "barbar"
+						data:  "foo" : "foofoo"
 						data:}"""))
 				.consumeNextWith(stringConsumer("\n\n"))
 				.consumeNextWith(stringConsumer("data:"))
 				.consumeNextWith(stringConsumer("""
 						{
-						data:  "foo" : "foofoofoo",
+						data:  "bar" : "barbarbar",
-						data:  "bar" : "barbarbar"
+						data:  "foo" : "foofoofoo"
 						data:}"""))
 				.consumeNextWith(stringConsumer("\n\n"))
 				.expectComplete()
@@ -203,7 +203,7 @@ class ServerSentEventHttpMessageWriterTests extends AbstractDataBufferAllocating
 		assertThat(outputMessage.getHeaders().getContentType()).isEqualTo(mediaType);
 		StepVerifier.create(outputMessage.getBody())
 				.consumeNextWith(stringConsumer("data:", charset))
-				.consumeNextWith(stringConsumer("{\"foo\":\"foo\uD834\uDD1E\",\"bar\":\"bar\uD834\uDD1E\"}", charset))
+				.consumeNextWith(stringConsumer("{\"bar\":\"bar\uD834\uDD1E\",\"foo\":\"foo\uD834\uDD1E\"}", charset))
 				.consumeNextWith(stringConsumer("\n\n", charset))
 				.expectComplete()
 				.verify();

spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborDecoderTests.java

@@ -0,0 +1,103 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.cbor;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import tools.jackson.core.JacksonException;
+import tools.jackson.dataformat.cbor.CBORMapper;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.testfixture.codec.AbstractDecoderTests;
+import org.springframework.http.MediaType;
+import org.springframework.web.testfixture.xml.Pojo;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.springframework.http.MediaType.APPLICATION_JSON;
+
+/**
+ * Tests for {@link JacksonCborDecoder}.
+ *
+ * @author Sebastien Deleuze
+ */
+class JacksonCborDecoderTests extends AbstractDecoderTests<JacksonCborDecoder> {
+
+	private Pojo pojo1 = new Pojo("f1", "b1");
+
+	private Pojo pojo2 = new Pojo("f2", "b2");
+
+	private CBORMapper mapper = CBORMapper.builder().build();
+
+	public JacksonCborDecoderTests() {
+		super(new JacksonCborDecoder());
+	}
+
+	@Override
+	@Test
+	protected void canDecode() {
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), MediaType.APPLICATION_CBOR)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), null)).isTrue();
+
+		assertThat(decoder.canDecode(ResolvableType.forClass(String.class), null)).isFalse();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), APPLICATION_JSON)).isFalse();
+	}
+
+	@Override
+	@Test
+	protected void decode() {
+		Flux<DataBuffer> input = Flux.just(this.pojo1, this.pojo2)
+				.map(this::writeObject)
+				.flatMap(this::dataBuffer);
+		assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() ->
+				testDecodeAll(input, Pojo.class, step -> step
+						.expectNext(pojo1)
+						.expectNext(pojo2)
+						.verifyComplete()));
+
+	}
+
+	private byte[] writeObject(Object o) {
+		try {
+			return this.mapper.writer().writeValueAsBytes(o);
+		}
+		catch (JacksonException e) {
+			throw new AssertionError(e);
+		}
+
+	}
+
+	@Override
+	@Test
+	protected void decodeToMono() {
+		List<Pojo> expected = Arrays.asList(pojo1, pojo2);
+
+		Flux<DataBuffer> input = Flux.just(expected)
+				.map(this::writeObject)
+				.flatMap(this::dataBuffer);
+
+		ResolvableType elementType = ResolvableType.forClassWithGenerics(List.class, Pojo.class);
+		testDecodeToMono(input, elementType, step -> step
+				.expectNext(expected)
+				.expectComplete()
+				.verify(), null, null);
+	}
+}

spring-web/src/test/java/org/springframework/http/codec/cbor/JacksonCborEncoderTests.java

@@ -0,0 +1,91 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.cbor;
+
+import java.util.function.Consumer;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import tools.jackson.dataformat.cbor.CBORMapper;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.testfixture.io.buffer.AbstractLeakCheckingTests;
+import org.springframework.core.testfixture.io.buffer.DataBufferTestUtils;
+import org.springframework.http.MediaType;
+import org.springframework.web.testfixture.xml.Pojo;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.springframework.core.io.buffer.DataBufferUtils.release;
+import static org.springframework.http.MediaType.APPLICATION_XML;
+
+/**
+ * Tests for {@link JacksonCborEncoder}.
+ *
+ * @author Sebastien Deleuze
+ */
+class JacksonCborEncoderTests extends AbstractLeakCheckingTests {
+
+	private final CBORMapper mapper = CBORMapper.builder().build();
+
+	private final JacksonCborEncoder encoder = new JacksonCborEncoder();
+
+	private Consumer<DataBuffer> pojoConsumer(Pojo expected) {
+		return dataBuffer -> {
+			Pojo actual = this.mapper.reader().forType(Pojo.class)
+					.readValue(DataBufferTestUtils.dumpBytes(dataBuffer));
+			assertThat(actual).isEqualTo(expected);
+			release(dataBuffer);
+		};
+	}
+
+	@Test
+	void canEncode() {
+		ResolvableType pojoType = ResolvableType.forClass(Pojo.class);
+		assertThat(this.encoder.canEncode(pojoType, MediaType.APPLICATION_CBOR)).isTrue();
+		assertThat(this.encoder.canEncode(pojoType, null)).isTrue();
+
+		// SPR-15464
+		assertThat(this.encoder.canEncode(ResolvableType.NONE, null)).isTrue();
+	}
+
+	@Test
+	void canNotEncode() {
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(String.class), null)).isFalse();
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(Pojo.class), APPLICATION_XML)).isFalse();
+	}
+
+	@Test
+	void encode() {
+		Pojo value = new Pojo("foo", "bar");
+		DataBuffer result = encoder.encodeValue(value, this.bufferFactory, ResolvableType.forClass(Pojo.class),
+				MediaType.APPLICATION_CBOR, null);
+		pojoConsumer(value).accept(result);
+	}
+
+	@Test
+	void encodeStream() {
+		Pojo pojo1 = new Pojo("foo", "bar");
+		Pojo pojo2 = new Pojo("foofoo", "barbar");
+		Pojo pojo3 = new Pojo("foofoofoo", "barbarbar");
+		Flux<Pojo> input = Flux.just(pojo1, pojo2, pojo3);
+		ResolvableType type = ResolvableType.forClass(Pojo.class);
+		assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() ->
+				encoder.encode(input, this.bufferFactory, type, MediaType.APPLICATION_CBOR, null));
+	}
+}

spring-web/src/test/java/org/springframework/http/codec/json/CustomizedJacksonJsonDecoderTests.java

@@ -0,0 +1,123 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.json;
+
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import tools.jackson.databind.ObjectReader;
+import tools.jackson.databind.cfg.EnumFeature;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.testfixture.codec.AbstractDecoderTests;
+
+/**
+ * Tests for a customized {@link JacksonJsonDecoder}.
+ *
+ * @author Sebastien Deleuze
+ */
+class CustomizedJacksonJsonDecoderTests extends AbstractDecoderTests<JacksonJsonDecoder> {
+
+	CustomizedJacksonJsonDecoderTests() {
+		super(new JacksonJsonDecoderWithCustomization());
+	}
+
+
+	@Override
+	public void canDecode() throws Exception {
+		// Not Testing, covered under JacksonJsonDecoderTests
+	}
+
+	@Test
+	@Override
+	public void decode() throws Exception {
+		Flux<DataBuffer> input = Flux.concat(stringBuffer("{\"property\":\"Value1\"}"));
+
+		testDecodeAll(input, MyCustomizedDecoderBean.class, step -> step
+				.expectNextMatches(obj -> obj.getProperty() == MyCustomDecoderEnum.VAL1)
+				.verifyComplete());
+	}
+
+	@Test
+	@Override
+	public void decodeToMono() throws Exception {
+		Mono<DataBuffer> input = stringBuffer("{\"property\":\"Value2\"}");
+
+		ResolvableType elementType = ResolvableType.forClass(MyCustomizedDecoderBean.class);
+
+		testDecodeToMono(input, elementType, step -> step
+				.expectNextMatches(obj -> ((MyCustomizedDecoderBean)obj).getProperty() == MyCustomDecoderEnum.VAL2)
+				.expectComplete()
+				.verify(), null, null);
+	}
+
+	private Mono<DataBuffer> stringBuffer(String value) {
+		return stringBuffer(value, StandardCharsets.UTF_8);
+	}
+
+	private Mono<DataBuffer> stringBuffer(String value, Charset charset) {
+		return Mono.defer(() -> {
+			byte[] bytes = value.getBytes(charset);
+			DataBuffer buffer = this.bufferFactory.allocateBuffer(bytes.length);
+			buffer.write(bytes);
+			return Mono.just(buffer);
+		});
+	}
+
+
+	private static class MyCustomizedDecoderBean {
+
+		private MyCustomDecoderEnum property;
+
+		public MyCustomDecoderEnum getProperty() {
+			return property;
+		}
+
+		@SuppressWarnings("unused")
+		public void setProperty(MyCustomDecoderEnum property) {
+			this.property = property;
+		}
+	}
+
+
+	private enum MyCustomDecoderEnum {
+		VAL1,
+		VAL2;
+
+		@Override
+		public String toString() {
+			return this == VAL1 ? "Value1" : "Value2";
+		}
+	}
+
+
+	private static class JacksonJsonDecoderWithCustomization extends JacksonJsonDecoder {
+
+		@Override
+		protected ObjectReader customizeReader(
+				ObjectReader reader, ResolvableType elementType, Map<String, Object> hints) {
+
+			return reader.with(EnumFeature.READ_ENUMS_USING_TO_STRING);
+		}
+	}
+
+}

spring-web/src/test/java/org/springframework/http/codec/json/CustomizedJacksonJsonEncoderTests.java

@@ -0,0 +1,121 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.json;
+
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import tools.jackson.databind.ObjectWriter;
+import tools.jackson.databind.cfg.EnumFeature;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.DataBufferUtils;
+import org.springframework.core.testfixture.codec.AbstractEncoderTests;
+import org.springframework.util.MimeType;
+
+import static org.springframework.http.MediaType.APPLICATION_NDJSON;
+
+/**
+ * Tests for a customized {@link JacksonJsonEncoder}.
+ *
+ * @author Sebastien Deleuze
+ */
+class CustomizedJacksonJsonEncoderTests extends AbstractEncoderTests<JacksonJsonEncoder> {
+
+	CustomizedJacksonJsonEncoderTests() {
+		super(new JacksonJsonEncoderWithCustomization());
+	}
+
+
+	@Override
+	public void canEncode() throws Exception {
+		// Not Testing, covered under JacksonJsonEncoderTests
+	}
+
+	@Test
+	@Override
+	public void encode() throws Exception {
+		Flux<MyCustomizedEncoderBean> input = Flux.just(
+				new MyCustomizedEncoderBean(MyCustomEncoderEnum.VAL1),
+				new MyCustomizedEncoderBean(MyCustomEncoderEnum.VAL2)
+		);
+
+		testEncodeAll(input, ResolvableType.forClass(MyCustomizedEncoderBean.class), APPLICATION_NDJSON, null, step -> step
+				.consumeNextWith(expectString("{\"property\":\"Value1\"}\n"))
+				.consumeNextWith(expectString("{\"property\":\"Value2\"}\n"))
+				.verifyComplete()
+		);
+	}
+
+	@Test
+	void encodeNonStream() {
+		Flux<MyCustomizedEncoderBean> input = Flux.just(
+				new MyCustomizedEncoderBean(MyCustomEncoderEnum.VAL1),
+				new MyCustomizedEncoderBean(MyCustomEncoderEnum.VAL2)
+		);
+
+		testEncode(input, MyCustomizedEncoderBean.class, step -> step
+				.consumeNextWith(expectString("[{\"property\":\"Value1\"}").andThen(DataBufferUtils::release))
+				.consumeNextWith(expectString(",{\"property\":\"Value2\"}").andThen(DataBufferUtils::release))
+				.consumeNextWith(expectString("]").andThen(DataBufferUtils::release))
+				.verifyComplete());
+	}
+
+
+	private static class MyCustomizedEncoderBean {
+
+		private MyCustomEncoderEnum property;
+
+		public MyCustomizedEncoderBean(MyCustomEncoderEnum property) {
+			this.property = property;
+		}
+
+		@SuppressWarnings("unused")
+		public MyCustomEncoderEnum getProperty() {
+			return property;
+		}
+
+		@SuppressWarnings("unused")
+		public void setProperty(MyCustomEncoderEnum property) {
+			this.property = property;
+		}
+	}
+
+
+	private enum MyCustomEncoderEnum {
+		VAL1,
+		VAL2;
+
+		@Override
+		public String toString() {
+			return this == VAL1 ? "Value1" : "Value2";
+		}
+	}
+
+
+	private static class JacksonJsonEncoderWithCustomization extends JacksonJsonEncoder {
+
+		@Override
+		protected ObjectWriter customizeWriter(
+				ObjectWriter writer, MimeType mimeType, ResolvableType elementType, Map<String, Object> hints) {
+
+			return writer.with(EnumFeature.WRITE_ENUMS_USING_TO_STRING);
+		}
+	}
+
+}

spring-web/src/test/java/org/springframework/http/codec/json/JacksonJsonDecoderTests.java

@@ -0,0 +1,414 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.json;
+
+import java.math.BigDecimal;
+import java.nio.charset.Charset;
+import java.nio.charset.StandardCharsets;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+import java.util.Map;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+import tools.jackson.core.JsonParser;
+import tools.jackson.databind.DeserializationContext;
+import tools.jackson.databind.JsonNode;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.annotation.JsonDeserialize;
+import tools.jackson.databind.deser.std.StdDeserializer;
+import tools.jackson.databind.json.JsonMapper;
+
+import org.springframework.core.ParameterizedTypeReference;
+import org.springframework.core.ResolvableType;
+import org.springframework.core.codec.CodecException;
+import org.springframework.core.codec.DecodingException;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.testfixture.codec.AbstractDecoderTests;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.json.JacksonViewBean.MyJacksonView1;
+import org.springframework.http.codec.json.JacksonViewBean.MyJacksonView3;
+import org.springframework.util.MimeType;
+import org.springframework.util.MimeTypeUtils;
+import org.springframework.web.testfixture.xml.Pojo;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.springframework.http.MediaType.APPLICATION_JSON;
+import static org.springframework.http.MediaType.APPLICATION_NDJSON;
+import static org.springframework.http.MediaType.APPLICATION_XML;
+import static org.springframework.http.codec.JacksonCodecSupport.JSON_VIEW_HINT;
+
+/**
+ * Tests for {@link JacksonJsonDecoder}.
+ *
+ * @author Sebastien Deleuze
+ */
+class JacksonJsonDecoderTests extends AbstractDecoderTests<JacksonJsonDecoder> {
+
+	private final Pojo pojo1 = new Pojo("f1", "b1");
+
+	private final Pojo pojo2 = new Pojo("f2", "b2");
+
+
+	public JacksonJsonDecoderTests() {
+		super(new JacksonJsonDecoder(JsonMapper.builder().build()));
+	}
+
+
+	@Override
+	@Test
+	public void canDecode() {
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), APPLICATION_JSON)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), APPLICATION_NDJSON)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), null)).isTrue();
+
+		assertThat(decoder.canDecode(ResolvableType.forClass(String.class), null)).isFalse();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), APPLICATION_XML)).isFalse();
+		assertThat(this.decoder.canDecode(ResolvableType.forClass(Pojo.class),
+				new MediaType("application", "json", StandardCharsets.UTF_8))).isTrue();
+		assertThat(this.decoder.canDecode(ResolvableType.forClass(Pojo.class),
+				new MediaType("application", "json", StandardCharsets.US_ASCII))).isTrue();
+		assertThat(this.decoder.canDecode(ResolvableType.forClass(Pojo.class),
+				new MediaType("application", "json", StandardCharsets.ISO_8859_1))).isTrue();
+	}
+
+	@Test
+	void canDecodeWithObjectMapperRegistrationForType() {
+		MediaType halJsonMediaType = MediaType.parseMediaType("application/hal+json");
+		MediaType halFormsJsonMediaType = MediaType.parseMediaType("application/prs.hal-forms+json");
+
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), halJsonMediaType)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), MediaType.APPLICATION_JSON)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), halFormsJsonMediaType)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Map.class), MediaType.APPLICATION_JSON)).isTrue();
+
+		decoder.registerObjectMappersForType(Pojo.class, map -> {
+			map.put(halJsonMediaType, new ObjectMapper());
+			map.put(MediaType.APPLICATION_JSON, new ObjectMapper());
+		});
+
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), halJsonMediaType)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), MediaType.APPLICATION_JSON)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), halFormsJsonMediaType)).isFalse();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Map.class), MediaType.APPLICATION_JSON)).isTrue();
+
+	}
+
+	@Test  // SPR-15866
+	void canDecodeWithProvidedMimeType() {
+		MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);
+		JacksonJsonDecoder decoder = new JacksonJsonDecoder(new ObjectMapper(), textJavascript);
+
+		assertThat(decoder.getDecodableMimeTypes()).isEqualTo(Collections.singletonList(textJavascript));
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	void decodableMimeTypesIsImmutable() {
+		MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);
+		JacksonJsonDecoder decoder = new JacksonJsonDecoder(new ObjectMapper(), textJavascript);
+
+		assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() ->
+						decoder.getDecodableMimeTypes().add(new MimeType("text", "ecmascript")));
+	}
+
+	@Test
+	void decodableMimeTypesWithObjectMapperRegistration() {
+		MimeType mimeType1 = MediaType.parseMediaType("application/hal+json");
+		MimeType mimeType2 = new MimeType("text", "javascript", StandardCharsets.UTF_8);
+
+		JacksonJsonDecoder decoder = new JacksonJsonDecoder(new ObjectMapper(), mimeType2);
+		decoder.registerObjectMappersForType(Pojo.class, map -> map.put(mimeType1, new ObjectMapper()));
+
+		assertThat(decoder.getDecodableMimeTypes(ResolvableType.forClass(Pojo.class)))
+				.containsExactly(mimeType1);
+	}
+
+	@Override
+	@Test
+	protected void decode() {
+		Flux<DataBuffer> input = Flux.concat(
+				stringBuffer("[{\"bar\":\"b1\",\"foo\":\"f1\"},"),
+				stringBuffer("{\"bar\":\"b2\",\"foo\":\"f2\"}]"));
+
+		testDecodeAll(input, Pojo.class, step -> step
+				.expectNext(pojo1)
+				.expectNext(pojo2)
+				.verifyComplete());
+	}
+
+	@Override
+	@Test
+	protected void decodeToMono() {
+		Flux<DataBuffer> input = Flux.concat(
+				stringBuffer("[{\"bar\":\"b1\",\"foo\":\"f1\"},"),
+				stringBuffer("{\"bar\":\"b2\",\"foo\":\"f2\"}]"));
+
+		ResolvableType elementType = ResolvableType.forClassWithGenerics(List.class, Pojo.class);
+
+		testDecodeToMonoAll(input, elementType, step -> step
+				.expectNext(Arrays.asList(new Pojo("f1", "b1"), new Pojo("f2", "b2")))
+				.expectComplete()
+				.verify(), null, null);
+	}
+
+	@Test
+	void decodeToFluxWithListElements() {
+		Flux<DataBuffer> input = Flux.concat(
+				stringBuffer("[{\"bar\":\"b1\",\"foo\":\"f1\"},{\"bar\":\"b2\",\"foo\":\"f2\"}]"),
+				stringBuffer("[{\"bar\":\"b3\",\"foo\":\"f3\"},{\"bar\":\"b4\",\"foo\":\"f4\"}]"));
+
+		ResolvableType elementType = ResolvableType.forClassWithGenerics(List.class, Pojo.class);
+
+		testDecodeAll(input, elementType,
+				step -> step
+						.expectNext(List.of(pojo1, pojo2))
+						.expectNext(List.of(new Pojo("f3", "b3"), new Pojo("f4", "b4")))
+						.verifyComplete(),
+				MimeTypeUtils.APPLICATION_JSON,
+				Collections.emptyMap());
+	}
+
+	@Test
+	void decodeEmptyArrayToFlux() {
+		Flux<DataBuffer> input = Flux.from(stringBuffer("[]"));
+
+		testDecode(input, Pojo.class, StepVerifier.LastStep::verifyComplete);
+	}
+
+	@Test
+	void fieldLevelJsonView() {
+		Flux<DataBuffer> input = Flux.from(stringBuffer(
+				"{\"withView1\" : \"with\", \"withView2\" : \"with\", \"withoutView\" : \"without\"}"));
+
+		ResolvableType elementType = ResolvableType.forClass(JacksonViewBean.class);
+		Map<String, Object> hints = Collections.singletonMap(JSON_VIEW_HINT, MyJacksonView1.class);
+
+		testDecode(input, elementType, step -> step
+				.consumeNextWith(value -> {
+					JacksonViewBean bean = (JacksonViewBean) value;
+					assertThat(bean.getWithView1()).isEqualTo("with");
+					assertThat(bean.getWithView2()).isNull();
+					assertThat(bean.getWithoutView()).isNull();
+				}), null, hints);
+	}
+
+	@Test
+	void classLevelJsonView() {
+		Flux<DataBuffer> input = Flux.from(stringBuffer(
+				"{\"withoutView\" : \"without\"}"));
+
+		ResolvableType elementType = ResolvableType.forClass(JacksonViewBean.class);
+		Map<String, Object> hints = Collections.singletonMap(JSON_VIEW_HINT, MyJacksonView3.class);
+
+		testDecode(input, elementType, step -> step
+				.consumeNextWith(value -> {
+					JacksonViewBean bean = (JacksonViewBean) value;
+					assertThat(bean.getWithoutView()).isEqualTo("without");
+					assertThat(bean.getWithView1()).isNull();
+					assertThat(bean.getWithView2()).isNull();
+				})
+				.verifyComplete(), null, hints);
+	}
+
+	@Test
+	void invalidData() {
+		Flux<DataBuffer> input = Flux.from(stringBuffer("{\"foofoo\": \"foofoo\", \"barbar\": \"barbar\""));
+		testDecode(input, Pojo.class, step -> step.verifyError(DecodingException.class));
+	}
+
+	@Test // gh-22042
+	void decodeWithNullLiteral() {
+		Flux<Object> result = this.decoder.decode(Flux.concat(stringBuffer("null")),
+				ResolvableType.forType(Pojo.class), MediaType.APPLICATION_JSON, Collections.emptyMap());
+
+		StepVerifier.create(result).expectComplete().verify();
+	}
+
+	@Test // gh-27511
+	void noDefaultConstructor() {
+		Flux<DataBuffer> input = Flux.from(stringBuffer("{\"property1\":\"foo\",\"property2\":\"bar\"}"));
+
+		testDecode(input, BeanWithNoDefaultConstructor.class, step -> step
+				.consumeNextWith(o -> {
+					assertThat(o.getProperty1()).isEqualTo("foo");
+					assertThat(o.getProperty2()).isEqualTo("bar");
+				})
+				.verifyComplete()
+		);
+	}
+
+	@Test
+	void codecException() {
+		Flux<DataBuffer> input = Flux.from(stringBuffer("["));
+		ResolvableType elementType = ResolvableType.forClass(BeanWithNoDefaultConstructor.class);
+		Flux<Object> flux = new Jackson2JsonDecoder().decode(input, elementType, null, Collections.emptyMap());
+		StepVerifier.create(flux).verifyError(CodecException.class);
+	}
+
+	@Test  // SPR-15975
+	void customDeserializer() {
+		Mono<DataBuffer> input = stringBuffer("{\"test\": 1}");
+
+		testDecode(input, TestObject.class, step -> step
+				.consumeNextWith(o -> assertThat(o.getTest()).isEqualTo(1))
+				.verifyComplete()
+		);
+	}
+
+	@Test
+	void bigDecimalFlux() {
+		Flux<DataBuffer> input = stringBuffer("[ 1E+2 ]").flux();
+
+		testDecode(input, BigDecimal.class, step -> step
+				.expectNext(new BigDecimal("1E+2"))
+				.verifyComplete()
+		);
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	void decodeNonUtf8Encoding() {
+		Mono<DataBuffer> input = stringBuffer("{\"foo\":\"bar\"}", StandardCharsets.UTF_16);
+		ResolvableType type = ResolvableType.forType(new ParameterizedTypeReference<Map<String, String>>() {});
+
+		testDecode(input, type, step -> step
+						.assertNext(value -> assertThat((Map<String, String>) value).containsEntry("foo", "bar"))
+						.verifyComplete(),
+				MediaType.parseMediaType("application/json; charset=utf-16"),
+				null);
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	void decodeNonUnicode() {
+		Flux<DataBuffer> input = Flux.concat(stringBuffer("{\"føø\":\"bår\"}", StandardCharsets.ISO_8859_1));
+		ResolvableType type = ResolvableType.forType(new ParameterizedTypeReference<Map<String, String>>() {});
+
+		testDecode(input, type, step -> step
+						.assertNext(o -> assertThat((Map<String, String>) o).containsEntry("føø", "bår"))
+						.verifyComplete(),
+				MediaType.parseMediaType("application/json; charset=iso-8859-1"),
+				null);
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	void decodeMonoNonUtf8Encoding() {
+		Mono<DataBuffer> input = stringBuffer("{\"foo\":\"bar\"}", StandardCharsets.UTF_16);
+		ResolvableType type = ResolvableType.forType(new ParameterizedTypeReference<Map<String, String>>() {});
+
+		testDecodeToMono(input, type, step -> step
+						.assertNext(value -> assertThat((Map<String, String>) value).containsEntry("foo", "bar"))
+						.verifyComplete(),
+				MediaType.parseMediaType("application/json; charset=utf-16"),
+				null);
+	}
+
+	@Test
+	@SuppressWarnings("unchecked")
+	void decodeAscii() {
+		Flux<DataBuffer> input = Flux.concat(stringBuffer("{\"foo\":\"bar\"}", StandardCharsets.US_ASCII));
+		ResolvableType type = ResolvableType.forType(new ParameterizedTypeReference<Map<String, String>>() {});
+
+		testDecode(input, type, step -> step
+						.assertNext(value -> assertThat((Map<String, String>) value).containsEntry("foo", "bar"))
+						.verifyComplete(),
+				MediaType.parseMediaType("application/json; charset=us-ascii"),
+				null);
+	}
+
+	@Test
+	void cancelWhileDecoding() {
+		Flux<DataBuffer> input = Flux.just(
+				stringBuffer("[{\"bar\":\"b1\",\"foo\":\"f1\"},").block(),
+				stringBuffer("{\"bar\":\"b2\",\"foo\":\"f2\"}]").block());
+
+		testDecodeCancel(input, ResolvableType.forClass(Pojo.class), null, null);
+	}
+
+
+	private Mono<DataBuffer> stringBuffer(String value) {
+		return stringBuffer(value, StandardCharsets.UTF_8);
+	}
+
+	private Mono<DataBuffer> stringBuffer(String value, Charset charset) {
+		return Mono.defer(() -> {
+			byte[] bytes = value.getBytes(charset);
+			DataBuffer buffer = this.bufferFactory.allocateBuffer(bytes.length);
+			buffer.write(bytes);
+			return Mono.just(buffer);
+		});
+	}
+
+
+	@SuppressWarnings("unused")
+	private static class BeanWithNoDefaultConstructor {
+
+		private final String property1;
+
+		private final String property2;
+
+		public BeanWithNoDefaultConstructor(String property1, String property2) {
+			this.property1 = property1;
+			this.property2 = property2;
+		}
+
+		public String getProperty1() {
+			return this.property1;
+		}
+
+		public String getProperty2() {
+			return this.property2;
+		}
+	}
+
+
+	@JsonDeserialize(using = Deserializer.class)
+	private static class TestObject {
+
+		private int test;
+
+		public int getTest() {
+			return this.test;
+		}
+		public void setTest(int test) {
+			this.test = test;
+		}
+	}
+
+
+	private static class Deserializer extends StdDeserializer<TestObject> {
+
+		Deserializer() {
+			super(TestObject.class);
+		}
+
+		@Override
+		public TestObject deserialize(JsonParser p, DeserializationContext ctxt) {
+			JsonNode node = p.readValueAsTree();
+			TestObject result = new TestObject();
+			result.setTest(node.get("test").asInt());
+			return result;
+		}
+	}
+
+}

spring-web/src/test/java/org/springframework/http/codec/json/JacksonJsonEncoderTests.java

@@ -0,0 +1,268 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.json;
+
+import java.nio.charset.StandardCharsets;
+import java.time.Duration;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.Map;
+
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.annotation.JsonTypeName;
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+import tools.jackson.databind.ObjectMapper;
+import tools.jackson.databind.SerializationFeature;
+import tools.jackson.databind.json.JsonMapper;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.testfixture.codec.AbstractEncoderTests;
+import org.springframework.http.MediaType;
+import org.springframework.http.codec.json.JacksonViewBean.MyJacksonView1;
+import org.springframework.http.codec.json.JacksonViewBean.MyJacksonView3;
+import org.springframework.http.converter.json.MappingJacksonValue;
+import org.springframework.util.MimeType;
+import org.springframework.util.MimeTypeUtils;
+import org.springframework.web.testfixture.xml.Pojo;
+
+import static java.util.Collections.singletonMap;
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
+import static org.assertj.core.api.Assertions.assertThatThrownBy;
+import static org.springframework.http.MediaType.APPLICATION_JSON;
+import static org.springframework.http.MediaType.APPLICATION_NDJSON;
+import static org.springframework.http.MediaType.APPLICATION_OCTET_STREAM;
+import static org.springframework.http.MediaType.APPLICATION_XML;
+import static org.springframework.http.codec.JacksonCodecSupport.JSON_VIEW_HINT;
+
+/**
+ * Tests for {@link JacksonJsonEncoder}.
+ * @author Sebastien Deleuze
+ */
+class JacksonJsonEncoderTests extends AbstractEncoderTests<JacksonJsonEncoder> {
+
+	public JacksonJsonEncoderTests() {
+		super(new JacksonJsonEncoder());
+	}
+
+	@Override
+	@Test
+	public void canEncode() {
+		ResolvableType pojoType = ResolvableType.forClass(Pojo.class);
+		assertThat(this.encoder.canEncode(pojoType, APPLICATION_JSON)).isTrue();
+		assertThat(this.encoder.canEncode(pojoType, APPLICATION_NDJSON)).isTrue();
+		assertThat(this.encoder.canEncode(pojoType, null)).isTrue();
+
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(Pojo.class),
+				new MediaType("application", "json", StandardCharsets.UTF_8))).isTrue();
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(Pojo.class),
+				new MediaType("application", "json", StandardCharsets.US_ASCII))).isTrue();
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(Pojo.class),
+				new MediaType("application", "json", StandardCharsets.ISO_8859_1))).isFalse();
+
+		// SPR-15464
+		assertThat(this.encoder.canEncode(ResolvableType.NONE, null)).isTrue();
+
+		// SPR-15910
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(Object.class), APPLICATION_OCTET_STREAM)).isFalse();
+
+		assertThatThrownBy(() -> this.encoder.canEncode(ResolvableType.forClass(MappingJacksonValue.class), APPLICATION_JSON))
+				.isInstanceOf(UnsupportedOperationException.class);
+	}
+
+	@Override
+	@Test
+	public void encode() throws Exception {
+		Flux<Object> input = Flux.just(new Pojo("foo", "bar"),
+				new Pojo("foofoo", "barbar"),
+				new Pojo("foofoofoo", "barbarbar"));
+
+		testEncodeAll(input, ResolvableType.forClass(Pojo.class), APPLICATION_NDJSON, null, step -> step
+				.consumeNextWith(expectString("{\"bar\":\"bar\",\"foo\":\"foo\"}\n"))
+				.consumeNextWith(expectString("{\"bar\":\"barbar\",\"foo\":\"foofoo\"}\n"))
+				.consumeNextWith(expectString("{\"bar\":\"barbarbar\",\"foo\":\"foofoofoo\"}\n"))
+				.verifyComplete()
+		);
+	}
+
+	@Test  // SPR-15866
+	public void canEncodeWithCustomMimeType() {
+		MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);
+		JacksonJsonEncoder encoder = new JacksonJsonEncoder(new ObjectMapper(), textJavascript);
+
+		assertThat(encoder.getEncodableMimeTypes()).isEqualTo(Collections.singletonList(textJavascript));
+	}
+
+	@Test
+	void encodableMimeTypesIsImmutable() {
+		MimeType textJavascript = new MimeType("text", "javascript", StandardCharsets.UTF_8);
+		JacksonJsonEncoder encoder = new JacksonJsonEncoder(new ObjectMapper(), textJavascript);
+
+		assertThatExceptionOfType(UnsupportedOperationException.class).isThrownBy(() ->
+				encoder.getEncodableMimeTypes().add(new MimeType("text", "ecmascript")));
+	}
+
+	@Test
+	void canNotEncode() {
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(String.class), null)).isFalse();
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(Pojo.class), APPLICATION_XML)).isFalse();
+	}
+
+	@Test
+	void encodeNonStream() {
+		Flux<Pojo> input = Flux.just(
+				new Pojo("foo", "bar"),
+				new Pojo("foofoo", "barbar"),
+				new Pojo("foofoofoo", "barbarbar")
+		);
+
+		testEncode(input, Pojo.class, step -> step
+				.consumeNextWith(expectString("[{\"bar\":\"bar\",\"foo\":\"foo\"}"))
+				.consumeNextWith(expectString(",{\"bar\":\"barbar\",\"foo\":\"foofoo\"}"))
+				.consumeNextWith(expectString(",{\"bar\":\"barbarbar\",\"foo\":\"foofoofoo\"}"))
+				.consumeNextWith(expectString("]"))
+				.verifyComplete());
+	}
+
+	@Test
+	void encodeNonStreamEmpty() {
+		testEncode(Flux.empty(), Pojo.class, step -> step
+				.consumeNextWith(expectString("["))
+				.consumeNextWith(expectString("]"))
+				.verifyComplete());
+	}
+
+	@Test  // gh-29038
+	void encodeNonStreamWithErrorAsFirstSignal() {
+		String message = "I'm a teapot";
+		Flux<Object> input = Flux.error(new IllegalStateException(message));
+
+		Flux<DataBuffer> output = this.encoder.encode(
+				input, this.bufferFactory, ResolvableType.forClass(Pojo.class), null, null);
+
+		StepVerifier.create(output).expectErrorMessage(message).verify();
+	}
+
+	@Test
+	void encodeWithType() {
+		Flux<ParentClass> input = Flux.just(new Foo(), new Bar());
+
+		testEncode(input, ParentClass.class, step -> step
+				.consumeNextWith(expectString("[{\"type\":\"foo\"}"))
+				.consumeNextWith(expectString(",{\"type\":\"bar\"}"))
+				.consumeNextWith(expectString("]"))
+				.verifyComplete());
+	}
+
+
+	@Test  // SPR-15727
+	public void encodeStreamWithCustomStreamingType() {
+		MediaType fooMediaType = new MediaType("application", "foo");
+		MediaType barMediaType = new MediaType("application", "bar");
+		this.encoder.setStreamingMediaTypes(Arrays.asList(fooMediaType, barMediaType));
+		Flux<Pojo> input = Flux.just(
+				new Pojo("foo", "bar"),
+				new Pojo("foofoo", "barbar"),
+				new Pojo("foofoofoo", "barbarbar")
+		);
+
+		testEncode(input, ResolvableType.forClass(Pojo.class), barMediaType, null, step -> step
+				.consumeNextWith(expectString("{\"bar\":\"bar\",\"foo\":\"foo\"}\n"))
+				.consumeNextWith(expectString("{\"bar\":\"barbar\",\"foo\":\"foofoo\"}\n"))
+				.consumeNextWith(expectString("{\"bar\":\"barbarbar\",\"foo\":\"foofoofoo\"}\n"))
+				.verifyComplete()
+		);
+	}
+
+	@Test
+	void fieldLevelJsonView() {
+		JacksonViewBean bean = new JacksonViewBean();
+		bean.setWithView1("with");
+		bean.setWithView2("with");
+		bean.setWithoutView("without");
+		Mono<JacksonViewBean> input = Mono.just(bean);
+
+		ResolvableType type = ResolvableType.forClass(JacksonViewBean.class);
+		Map<String, Object> hints = singletonMap(JSON_VIEW_HINT, MyJacksonView1.class);
+
+		testEncode(input, type, null, hints, step -> step
+				.consumeNextWith(expectString("{\"withView1\":\"with\"}"))
+				.verifyComplete()
+		);
+	}
+
+	@Test
+	void classLevelJsonView() {
+		JacksonViewBean bean = new JacksonViewBean();
+		bean.setWithView1("with");
+		bean.setWithView2("with");
+		bean.setWithoutView("without");
+		Mono<JacksonViewBean> input = Mono.just(bean);
+
+		ResolvableType type = ResolvableType.forClass(JacksonViewBean.class);
+		Map<String, Object> hints = singletonMap(JSON_VIEW_HINT, MyJacksonView3.class);
+
+		testEncode(input, type, null, hints, step -> step
+				.consumeNextWith(expectString("{\"withoutView\":\"without\"}"))
+				.verifyComplete()
+		);
+	}
+
+	@Test  // gh-22771
+	public void encodeWithFlushAfterWriteOff() {
+		ObjectMapper mapper = JsonMapper.builder().configure(SerializationFeature.FLUSH_AFTER_WRITE_VALUE, false).build();
+		JacksonJsonEncoder encoder = new JacksonJsonEncoder(mapper);
+
+		Flux<DataBuffer> result = encoder.encode(Flux.just(new Pojo("foo", "bar")), this.bufferFactory,
+				ResolvableType.forClass(Pojo.class), MimeTypeUtils.APPLICATION_JSON, Collections.emptyMap());
+
+		StepVerifier.create(result)
+				.consumeNextWith(expectString("[{\"bar\":\"bar\",\"foo\":\"foo\"}"))
+				.consumeNextWith(expectString("]"))
+				.expectComplete()
+				.verify(Duration.ofSeconds(5));
+	}
+
+	@Test
+	void encodeAscii() {
+		Mono<Object> input = Mono.just(new Pojo("foo", "bar"));
+		MimeType mimeType = new MimeType("application", "json", StandardCharsets.US_ASCII);
+
+		testEncode(input, ResolvableType.forClass(Pojo.class), mimeType, null, step -> step
+				.consumeNextWith(expectString("{\"bar\":\"bar\",\"foo\":\"foo\"}"))
+				.verifyComplete()
+		);
+	}
+
+
+	@JsonTypeInfo(use = JsonTypeInfo.Id.NAME, property = "type")
+	private static class ParentClass {
+	}
+
+	@JsonTypeName("foo")
+	private static class Foo extends ParentClass {
+	}
+
+	@JsonTypeName("bar")
+	private static class Bar extends ParentClass {
+	}
+
+}

spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileDecoderTests.java

@@ -0,0 +1,100 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.smile;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import tools.jackson.dataformat.smile.SmileMapper;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.testfixture.codec.AbstractDecoderTests;
+import org.springframework.util.MimeType;
+import org.springframework.web.testfixture.xml.Pojo;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.http.MediaType.APPLICATION_JSON;
+
+/**
+ * Tests for {@link JacksonSmileDecoder}.
+ *
+ * @author Sebastien Deleuze
+ */
+class JacksonSmileDecoderTests extends AbstractDecoderTests<JacksonSmileDecoder> {
+
+	private static final MimeType SMILE_MIME_TYPE = new MimeType("application", "x-jackson-smile");
+	private static final MimeType STREAM_SMILE_MIME_TYPE = new MimeType("application", "stream+x-jackson-smile");
+
+	private Pojo pojo1 = new Pojo("f1", "b1");
+
+	private Pojo pojo2 = new Pojo("f2", "b2");
+
+	private SmileMapper mapper = SmileMapper.builder().build();
+
+	public JacksonSmileDecoderTests() {
+		super(new JacksonSmileDecoder());
+	}
+
+	@Override
+	@Test
+	protected void canDecode() {
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), SMILE_MIME_TYPE)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), STREAM_SMILE_MIME_TYPE)).isTrue();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), null)).isTrue();
+
+		assertThat(decoder.canDecode(ResolvableType.forClass(String.class), null)).isFalse();
+		assertThat(decoder.canDecode(ResolvableType.forClass(Pojo.class), APPLICATION_JSON)).isFalse();
+	}
+
+	@Override
+	@Test
+	protected void decode() {
+		Flux<DataBuffer> input = Flux.just(this.pojo1, this.pojo2)
+				.map(this::writeObject)
+				.flatMap(this::dataBuffer);
+
+		testDecodeAll(input, Pojo.class, step -> step
+				.expectNext(pojo1)
+				.expectNext(pojo2)
+				.verifyComplete());
+
+	}
+
+	private byte[] writeObject(Object o) {
+		return this.mapper.writer().writeValueAsBytes(o);
+	}
+
+	@Override
+	@Test
+	protected void decodeToMono() {
+		List<Pojo> expected = Arrays.asList(pojo1, pojo2);
+
+		Flux<DataBuffer> input = Flux.just(expected)
+				.map(this::writeObject)
+				.flatMap(this::dataBuffer);
+
+		ResolvableType elementType = ResolvableType.forClassWithGenerics(List.class, Pojo.class);
+		testDecodeToMono(input, elementType, step -> step
+				.expectNext(expected)
+				.expectComplete()
+				.verify(), null, null);
+	}
+
+}

spring-web/src/test/java/org/springframework/http/codec/smile/JacksonSmileEncoderTests.java

@@ -0,0 +1,130 @@
+/*
+ * Copyright 2002-2025 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.springframework.http.codec.smile;
+
+import java.util.Arrays;
+import java.util.List;
+
+import org.junit.jupiter.api.Test;
+import reactor.core.publisher.Flux;
+import reactor.core.publisher.Mono;
+import reactor.test.StepVerifier;
+import tools.jackson.databind.MappingIterator;
+import tools.jackson.dataformat.smile.SmileMapper;
+
+import org.springframework.core.ResolvableType;
+import org.springframework.core.io.buffer.DataBuffer;
+import org.springframework.core.io.buffer.DataBufferUtils;
+import org.springframework.core.testfixture.codec.AbstractEncoderTests;
+import org.springframework.http.codec.ServerSentEvent;
+import org.springframework.http.codec.json.Jackson2SmileEncoder;
+import org.springframework.util.MimeType;
+import org.springframework.web.testfixture.xml.Pojo;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.core.io.buffer.DataBufferUtils.release;
+import static org.springframework.http.MediaType.APPLICATION_XML;
+
+/**
+ * Tests for {@link JacksonSmileEncoder}.
+ *
+ * @author Sebastien Deleuze
+ */
+class JacksonSmileEncoderTests extends AbstractEncoderTests<JacksonSmileEncoder> {
+
+	private static final MimeType SMILE_MIME_TYPE = new MimeType("application", "x-jackson-smile");
+	private static final MimeType STREAM_SMILE_MIME_TYPE = new MimeType("application", "stream+x-jackson-smile");
+
+	private final Jackson2SmileEncoder encoder = new Jackson2SmileEncoder();
+
+	private final SmileMapper mapper = SmileMapper.builder().build();
+
+	public JacksonSmileEncoderTests() {
+		super(new JacksonSmileEncoder());
+
+	}
+
+	@Override
+	@Test
+	protected void canEncode() {
+		ResolvableType pojoType = ResolvableType.forClass(Pojo.class);
+		assertThat(this.encoder.canEncode(pojoType, SMILE_MIME_TYPE)).isTrue();
+		assertThat(this.encoder.canEncode(pojoType, STREAM_SMILE_MIME_TYPE)).isTrue();
+		assertThat(this.encoder.canEncode(pojoType, null)).isTrue();
+
+		// SPR-15464
+		assertThat(this.encoder.canEncode(ResolvableType.NONE, null)).isTrue();
+	}
+
+	@Test
+	void canNotEncode() {
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(String.class), null)).isFalse();
+		assertThat(this.encoder.canEncode(ResolvableType.forClass(Pojo.class), APPLICATION_XML)).isFalse();
+
+		ResolvableType sseType = ResolvableType.forClass(ServerSentEvent.class);
+		assertThat(this.encoder.canEncode(sseType, SMILE_MIME_TYPE)).isFalse();
+	}
+
+	@Override
+	@Test
+	protected void encode() {
+		List<Pojo> list = Arrays.asList(
+				new Pojo("foo", "bar"),
+				new Pojo("foofoo", "barbar"),
+				new Pojo("foofoofoo", "barbarbar"));
+
+		Flux<Pojo> input = Flux.fromIterable(list);
+
+		testEncode(input, Pojo.class, step -> step
+				.consumeNextWith(dataBuffer -> {
+					try {
+						Object actual = this.mapper.reader().forType(List.class)
+								.readValue(dataBuffer.asInputStream());
+						assertThat(actual).isEqualTo(list);
+					}
+					finally {
+						release(dataBuffer);
+					}
+				}));
+	}
+
+	@Test
+	void encodeError() {
+		Mono<Pojo> input = Mono.error(new InputException());
+		testEncode(input, Pojo.class, step -> step.expectError(InputException.class).verify());
+	}
+
+	@Test
+	void encodeAsStream() {
+		Pojo pojo1 = new Pojo("foo", "bar");
+		Pojo pojo2 = new Pojo("foofoo", "barbar");
+		Pojo pojo3 = new Pojo("foofoofoo", "barbarbar");
+		Flux<Pojo> input = Flux.just(pojo1, pojo2, pojo3);
+		ResolvableType type = ResolvableType.forClass(Pojo.class);
+
+		Flux<DataBuffer> result = this.encoder
+				.encode(input, bufferFactory, type, STREAM_SMILE_MIME_TYPE, null);
+
+		Mono<MappingIterator<Pojo>> joined = DataBufferUtils.join(result)
+				.map(buffer -> this.mapper.reader().forType(Pojo.class).readValues(buffer.asInputStream(true)));
+
+		StepVerifier.create(joined)
+				.assertNext(iter -> assertThat(iter).toIterable().contains(pojo1, pojo2, pojo3))
+				.verifyComplete();
+	}
+
+}

spring-web/src/test/java/org/springframework/http/codec/support/ClientCodecConfigurerTests.java

@@ -23,7 +23,6 @@ import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.atomic.AtomicInteger;
 
-import com.fasterxml.jackson.databind.ObjectMapper;
 import org.junit.jupiter.api.Test;
 import reactor.core.publisher.Flux;
 
@@ -55,11 +54,8 @@ import org.springframework.http.codec.ResourceHttpMessageWriter;
 import org.springframework.http.codec.ServerSentEventHttpMessageReader;
 import org.springframework.http.codec.cbor.KotlinSerializationCborDecoder;
 import org.springframework.http.codec.cbor.KotlinSerializationCborEncoder;
-import org.springframework.http.codec.json.Jackson2CodecSupport;
+import org.springframework.http.codec.json.JacksonJsonDecoder;
-import org.springframework.http.codec.json.Jackson2JsonDecoder;
+import org.springframework.http.codec.json.JacksonJsonEncoder;
-import org.springframework.http.codec.json.Jackson2JsonEncoder;
-import org.springframework.http.codec.json.Jackson2SmileDecoder;
-import org.springframework.http.codec.json.Jackson2SmileEncoder;
 import org.springframework.http.codec.multipart.DefaultPartHttpMessageReader;
 import org.springframework.http.codec.multipart.MultipartHttpMessageReader;
 import org.springframework.http.codec.multipart.MultipartHttpMessageWriter;
@@ -70,6 +66,8 @@ import org.springframework.http.codec.protobuf.KotlinSerializationProtobufDecode
 import org.springframework.http.codec.protobuf.KotlinSerializationProtobufEncoder;
 import org.springframework.http.codec.protobuf.ProtobufDecoder;
 import org.springframework.http.codec.protobuf.ProtobufHttpMessageWriter;
+import org.springframework.http.codec.smile.JacksonSmileDecoder;
+import org.springframework.http.codec.smile.JacksonSmileEncoder;
 import org.springframework.http.codec.xml.Jaxb2XmlDecoder;
 import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
 import org.springframework.util.MimeTypeUtils;
@@ -81,6 +79,7 @@ import static org.springframework.core.ResolvableType.forClass;
  * Tests for {@link ClientCodecConfigurer}.
  *
  * @author Rossen Stoyanchev
+ * @author Sebastien Deleuze
  */
 class ClientCodecConfigurerTests {
 
@@ -107,8 +106,8 @@ class ClientCodecConfigurerTests {
 		assertThat(readers.get(this.index.getAndIncrement()).getClass()).isEqualTo(PartEventHttpMessageReader.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(KotlinSerializationCborDecoder.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(KotlinSerializationProtobufDecoder.class);
-		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jackson2JsonDecoder.class);
+		assertThat(getNextDecoder(readers).getClass()).isEqualTo(JacksonJsonDecoder.class);
-		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jackson2SmileDecoder.class);
+		assertThat(getNextDecoder(readers).getClass()).isEqualTo(JacksonSmileDecoder.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jaxb2XmlDecoder.class);
 		assertSseReader(readers);
 		assertStringDecoder(getNextDecoder(readers), false);
@@ -130,55 +129,33 @@ class ClientCodecConfigurerTests {
 		assertThat(writers.get(this.index.getAndIncrement()).getClass()).isEqualTo(PartHttpMessageWriter.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(KotlinSerializationCborEncoder.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(KotlinSerializationProtobufEncoder.class);
-		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jackson2JsonEncoder.class);
+		assertThat(getNextEncoder(writers).getClass()).isEqualTo(JacksonJsonEncoder.class);
-		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jackson2SmileEncoder.class);
+		assertThat(getNextEncoder(writers).getClass()).isEqualTo(JacksonSmileEncoder.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jaxb2XmlEncoder.class);
 		assertStringEncoder(getNextEncoder(writers), false);
 	}
 
 	@Test
-	void jackson2CodecCustomization() {
+	void jacksonCodecCustomization() {
-		Jackson2JsonDecoder decoder = new Jackson2JsonDecoder();
+		JacksonJsonDecoder decoder = new JacksonJsonDecoder();
-		Jackson2JsonEncoder encoder = new Jackson2JsonEncoder();
+		JacksonJsonEncoder encoder = new JacksonJsonEncoder();
-		this.configurer.defaultCodecs().jackson2JsonDecoder(decoder);
+		this.configurer.defaultCodecs().jacksonJsonDecoder(decoder);
-		this.configurer.defaultCodecs().jackson2JsonEncoder(encoder);
+		this.configurer.defaultCodecs().jacksonJsonEncoder(encoder);
 
 		List<HttpMessageReader<?>> readers = this.configurer.getReaders();
-		Jackson2JsonDecoder actualDecoder = findCodec(readers, Jackson2JsonDecoder.class);
+		JacksonJsonDecoder actualDecoder = findCodec(readers, JacksonJsonDecoder.class);
 		assertThat(actualDecoder).isSameAs(decoder);
 		assertThat(findCodec(readers, ServerSentEventHttpMessageReader.class).getDecoder()).isSameAs(decoder);
 
 		List<HttpMessageWriter<?>> writers = this.configurer.getWriters();
-		Jackson2JsonEncoder actualEncoder = findCodec(writers, Jackson2JsonEncoder.class);
+		JacksonJsonEncoder actualEncoder = findCodec(writers, JacksonJsonEncoder.class);
 		assertThat(actualEncoder).isSameAs(encoder);
 
 		MultipartHttpMessageWriter multipartWriter = findCodec(writers, MultipartHttpMessageWriter.class);
-		actualEncoder = findCodec(multipartWriter.getPartWriters(), Jackson2JsonEncoder.class);
+		actualEncoder = findCodec(multipartWriter.getPartWriters(), JacksonJsonEncoder.class);
 		assertThat(actualEncoder).isSameAs(encoder);
 	}
 
-	@Test
-	void objectMapperCustomization() {
-		ObjectMapper objectMapper = new ObjectMapper();
-		this.configurer.defaultCodecs().configureDefaultCodec(codec -> {
-			if (codec instanceof Jackson2CodecSupport) {
-				((Jackson2CodecSupport) codec).setObjectMapper(objectMapper);
-			}
-		});
-
-		List<HttpMessageReader<?>> readers = this.configurer.getReaders();
-		Jackson2JsonDecoder actualDecoder = findCodec(readers, Jackson2JsonDecoder.class);
-		assertThat(actualDecoder.getObjectMapper()).isSameAs(objectMapper);
-
-		List<HttpMessageWriter<?>> writers = this.configurer.getWriters();
-		Jackson2JsonEncoder actualEncoder = findCodec(writers, Jackson2JsonEncoder.class);
-		assertThat(actualEncoder.getObjectMapper()).isSameAs(objectMapper);
-
-		MultipartHttpMessageWriter multipartWriter = findCodec(writers, MultipartHttpMessageWriter.class);
-		actualEncoder = findCodec(multipartWriter.getPartWriters(), Jackson2JsonEncoder.class);
-		assertThat(actualEncoder.getObjectMapper()).isSameAs(objectMapper);
-	}
-
 	@Test
 	void maxInMemorySize() {
 		int size = 99;
@@ -198,13 +175,13 @@ class ClientCodecConfigurerTests {
 		assertThat(((PartEventHttpMessageReader) nextReader(readers)).getMaxInMemorySize()).isEqualTo(size);
 		assertThat(((KotlinSerializationCborDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
 		assertThat(((KotlinSerializationProtobufDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
-		assertThat(((Jackson2JsonDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
+		assertThat(((JacksonJsonDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
-		assertThat(((Jackson2SmileDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
+		assertThat(((JacksonSmileDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
 		assertThat(((Jaxb2XmlDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
 
 		ServerSentEventHttpMessageReader reader = (ServerSentEventHttpMessageReader) nextReader(readers);
 		assertThat(reader.getMaxInMemorySize()).isEqualTo(size);
-		assertThat(((Jackson2JsonDecoder) reader.getDecoder()).getMaxInMemorySize()).isEqualTo(size);
+		assertThat(((JacksonJsonDecoder) reader.getDecoder()).getMaxInMemorySize()).isEqualTo(size);
 
 		assertThat(((StringDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
 	}
@@ -226,9 +203,9 @@ class ClientCodecConfigurerTests {
 	void clonedConfigurer() {
 		ClientCodecConfigurer clone = this.configurer.clone();
 
-		Jackson2JsonDecoder jackson2Decoder = new Jackson2JsonDecoder();
+		JacksonJsonDecoder jacksonDecoder = new JacksonJsonDecoder();
-		clone.defaultCodecs().serverSentEventDecoder(jackson2Decoder);
+		clone.defaultCodecs().serverSentEventDecoder(jacksonDecoder);
-		clone.defaultCodecs().multipartCodecs().encoder(new Jackson2SmileEncoder());
+		clone.defaultCodecs().multipartCodecs().encoder(new JacksonSmileEncoder());
 		clone.defaultCodecs().multipartCodecs().writer(new ResourceHttpMessageWriter());
 
 		// Clone has the customizations
@@ -236,7 +213,7 @@ class ClientCodecConfigurerTests {
 		Decoder<?> sseDecoder = findCodec(clone.getReaders(), ServerSentEventHttpMessageReader.class).getDecoder();
 		List<HttpMessageWriter<?>> writers = findCodec(clone.getWriters(), MultipartHttpMessageWriter.class).getPartWriters();
 
-		assertThat(sseDecoder).isSameAs(jackson2Decoder);
+		assertThat(sseDecoder).isSameAs(jacksonDecoder);
 		assertThat(writers).hasSize(2);
 
 		// Original does not have the customizations
@@ -244,7 +221,7 @@ class ClientCodecConfigurerTests {
 		sseDecoder = findCodec(this.configurer.getReaders(), ServerSentEventHttpMessageReader.class).getDecoder();
 		writers = findCodec(this.configurer.getWriters(), MultipartHttpMessageWriter.class).getPartWriters();
 
-		assertThat(sseDecoder).isNotSameAs(jackson2Decoder);
+		assertThat(sseDecoder).isNotSameAs(jacksonDecoder);
 		assertThat(writers).hasSize(16);
 	}
 
@@ -264,7 +241,7 @@ class ClientCodecConfigurerTests {
 		ClientCodecConfigurer clone = this.configurer.clone();
 
 		this.configurer.registerDefaults(false);
-		this.configurer.customCodecs().register(new Jackson2JsonEncoder());
+		this.configurer.customCodecs().register(new JacksonJsonEncoder());
 
 		List<HttpMessageWriter<?>> writers =
 				findCodec(clone.getWriters(), MultipartHttpMessageWriter.class).getPartWriters();
@@ -332,7 +309,7 @@ class ClientCodecConfigurerTests {
 		assertThat(reader.getClass()).isEqualTo(ServerSentEventHttpMessageReader.class);
 		Decoder<?> decoder = ((ServerSentEventHttpMessageReader) reader).getDecoder();
 		assertThat(decoder).isNotNull();
-		assertThat(decoder.getClass()).isEqualTo(Jackson2JsonDecoder.class);
+		assertThat(decoder.getClass()).isEqualTo(JacksonJsonDecoder.class);
 	}
 
 }

spring-web/src/test/java/org/springframework/http/codec/support/CodecConfigurerTests.java

@@ -49,10 +49,8 @@ import org.springframework.http.codec.ServerSentEventHttpMessageReader;
 import org.springframework.http.codec.ServerSentEventHttpMessageWriter;
 import org.springframework.http.codec.cbor.KotlinSerializationCborDecoder;
 import org.springframework.http.codec.cbor.KotlinSerializationCborEncoder;
-import org.springframework.http.codec.json.Jackson2JsonDecoder;
+import org.springframework.http.codec.json.JacksonJsonDecoder;
-import org.springframework.http.codec.json.Jackson2JsonEncoder;
+import org.springframework.http.codec.json.JacksonJsonEncoder;
-import org.springframework.http.codec.json.Jackson2SmileDecoder;
-import org.springframework.http.codec.json.Jackson2SmileEncoder;
 import org.springframework.http.codec.multipart.DefaultPartHttpMessageReader;
 import org.springframework.http.codec.multipart.MultipartHttpMessageReader;
 import org.springframework.http.codec.multipart.MultipartHttpMessageWriter;
@@ -64,6 +62,8 @@ import org.springframework.http.codec.protobuf.KotlinSerializationProtobufEncode
 import org.springframework.http.codec.protobuf.ProtobufDecoder;
 import org.springframework.http.codec.protobuf.ProtobufEncoder;
 import org.springframework.http.codec.protobuf.ProtobufHttpMessageWriter;
+import org.springframework.http.codec.smile.JacksonSmileDecoder;
+import org.springframework.http.codec.smile.JacksonSmileEncoder;
 import org.springframework.http.codec.xml.Jaxb2XmlDecoder;
 import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
 import org.springframework.util.MimeTypeUtils;
@@ -102,8 +102,8 @@ class CodecConfigurerTests {
 		assertThat(readers.get(this.index.getAndIncrement()).getClass()).isEqualTo(PartEventHttpMessageReader.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(KotlinSerializationCborDecoder.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(KotlinSerializationProtobufDecoder.class);
-		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jackson2JsonDecoder.class);
+		assertThat(getNextDecoder(readers).getClass()).isEqualTo(JacksonJsonDecoder.class);
-		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jackson2SmileDecoder.class);
+		assertThat(getNextDecoder(readers).getClass()).isEqualTo(JacksonSmileDecoder.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jaxb2XmlDecoder.class);
 		assertStringDecoder(getNextDecoder(readers), false);
 	}
@@ -124,8 +124,8 @@ class CodecConfigurerTests {
 		assertThat(writers.get(index.getAndIncrement()).getClass()).isEqualTo(PartHttpMessageWriter.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(KotlinSerializationCborEncoder.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(KotlinSerializationProtobufEncoder.class);
-		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jackson2JsonEncoder.class);
+		assertThat(getNextEncoder(writers).getClass()).isEqualTo(JacksonJsonEncoder.class);
-		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jackson2SmileEncoder.class);
+		assertThat(getNextEncoder(writers).getClass()).isEqualTo(JacksonSmileEncoder.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jaxb2XmlEncoder.class);
 		assertStringEncoder(getNextEncoder(writers), false);
 	}
@@ -170,8 +170,8 @@ class CodecConfigurerTests {
 		assertThat(readers.get(this.index.getAndIncrement())).isSameAs(customReader2);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(KotlinSerializationCborDecoder.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(KotlinSerializationProtobufDecoder.class);
-		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jackson2JsonDecoder.class);
+		assertThat(getNextDecoder(readers).getClass()).isEqualTo(JacksonJsonDecoder.class);
-		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jackson2SmileDecoder.class);
+		assertThat(getNextDecoder(readers).getClass()).isEqualTo(JacksonSmileDecoder.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jaxb2XmlDecoder.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(StringDecoder.class);
 	}
@@ -215,8 +215,8 @@ class CodecConfigurerTests {
 		assertThat(writers.get(this.index.getAndIncrement())).isSameAs(customWriter2);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(KotlinSerializationCborEncoder.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(KotlinSerializationProtobufEncoder.class);
-		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jackson2JsonEncoder.class);
+		assertThat(getNextEncoder(writers).getClass()).isEqualTo(JacksonJsonEncoder.class);
-		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jackson2SmileEncoder.class);
+		assertThat(getNextEncoder(writers).getClass()).isEqualTo(JacksonSmileEncoder.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jaxb2XmlEncoder.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(CharSequenceEncoder.class);
 	}
@@ -285,19 +285,19 @@ class CodecConfigurerTests {
 
 	@Test
 	void encoderDecoderOverrides() {
-		Jackson2JsonDecoder jacksonDecoder = new Jackson2JsonDecoder();
+		JacksonJsonDecoder jacksonDecoder = new JacksonJsonDecoder();
-		Jackson2JsonEncoder jacksonEncoder = new Jackson2JsonEncoder();
+		JacksonJsonEncoder jacksonEncoder = new JacksonJsonEncoder();
-		Jackson2SmileDecoder smileDecoder = new Jackson2SmileDecoder();
+		JacksonSmileDecoder smileDecoder = new JacksonSmileDecoder();
-		Jackson2SmileEncoder smileEncoder = new Jackson2SmileEncoder();
+		JacksonSmileEncoder smileEncoder = new JacksonSmileEncoder();
 		ProtobufDecoder protobufDecoder = new ProtobufDecoder(ExtensionRegistry.newInstance());
 		ProtobufEncoder protobufEncoder = new ProtobufEncoder();
 		Jaxb2XmlEncoder jaxb2Encoder = new Jaxb2XmlEncoder();
 		Jaxb2XmlDecoder jaxb2Decoder = new Jaxb2XmlDecoder();
 
-		this.configurer.defaultCodecs().jackson2JsonDecoder(jacksonDecoder);
+		this.configurer.defaultCodecs().jacksonJsonDecoder(jacksonDecoder);
-		this.configurer.defaultCodecs().jackson2JsonEncoder(jacksonEncoder);
+		this.configurer.defaultCodecs().jacksonJsonEncoder(jacksonEncoder);
-		this.configurer.defaultCodecs().jackson2SmileDecoder(smileDecoder);
+		this.configurer.defaultCodecs().jacksonSmileDecoder(smileDecoder);
-		this.configurer.defaultCodecs().jackson2SmileEncoder(smileEncoder);
+		this.configurer.defaultCodecs().jacksonSmileEncoder(smileEncoder);
 		this.configurer.defaultCodecs().protobufDecoder(protobufDecoder);
 		this.configurer.defaultCodecs().protobufEncoder(protobufEncoder);
 		this.configurer.defaultCodecs().jaxb2Decoder(jaxb2Decoder);
@@ -320,8 +320,8 @@ class CodecConfigurerTests {
 		assertThat(this.configurer.getWriters()).isEmpty();
 
 		CodecConfigurer clone = this.configurer.clone();
-		clone.customCodecs().register(new Jackson2JsonEncoder());
+		clone.customCodecs().register(new JacksonJsonEncoder());
-		clone.customCodecs().register(new Jackson2JsonDecoder());
+		clone.customCodecs().register(new JacksonJsonDecoder());
 		clone.customCodecs().register(new ServerSentEventHttpMessageReader());
 		clone.customCodecs().register(new ServerSentEventHttpMessageWriter());
 
@@ -337,8 +337,8 @@ class CodecConfigurerTests {
 		assertThat(this.configurer.getReaders()).isEmpty();
 		assertThat(this.configurer.getWriters()).isEmpty();
 
-		this.configurer.customCodecs().register(new Jackson2JsonEncoder());
+		this.configurer.customCodecs().register(new JacksonJsonEncoder());
-		this.configurer.customCodecs().register(new Jackson2JsonDecoder());
+		this.configurer.customCodecs().register(new JacksonJsonDecoder());
 		this.configurer.customCodecs().register(new ServerSentEventHttpMessageReader());
 		this.configurer.customCodecs().register(new ServerSentEventHttpMessageWriter());
 		assertThat(this.configurer.getReaders()).hasSize(2);
@@ -355,15 +355,15 @@ class CodecConfigurerTests {
 	void cloneDefaultCodecs() {
 		CodecConfigurer clone = this.configurer.clone();
 
-		Jackson2JsonDecoder jacksonDecoder = new Jackson2JsonDecoder();
+		JacksonJsonDecoder jacksonDecoder = new JacksonJsonDecoder();
-		Jackson2JsonEncoder jacksonEncoder = new Jackson2JsonEncoder();
+		JacksonJsonEncoder jacksonEncoder = new JacksonJsonEncoder();
 		Jaxb2XmlDecoder jaxb2Decoder = new Jaxb2XmlDecoder();
 		Jaxb2XmlEncoder jaxb2Encoder = new Jaxb2XmlEncoder();
 		ProtobufDecoder protoDecoder = new ProtobufDecoder();
 		ProtobufEncoder protoEncoder = new ProtobufEncoder();
 
-		clone.defaultCodecs().jackson2JsonDecoder(jacksonDecoder);
+		clone.defaultCodecs().jacksonJsonDecoder(jacksonDecoder);
-		clone.defaultCodecs().jackson2JsonEncoder(jacksonEncoder);
+		clone.defaultCodecs().jacksonJsonEncoder(jacksonEncoder);
 		clone.defaultCodecs().jaxb2Decoder(jaxb2Decoder);
 		clone.defaultCodecs().jaxb2Encoder(jaxb2Encoder);
 		clone.defaultCodecs().protobufDecoder(protoDecoder);

spring-web/src/test/java/org/springframework/http/codec/support/ServerCodecConfigurerTests.java

@@ -54,10 +54,8 @@ import org.springframework.http.codec.ServerCodecConfigurer;
 import org.springframework.http.codec.ServerSentEventHttpMessageWriter;
 import org.springframework.http.codec.cbor.KotlinSerializationCborDecoder;
 import org.springframework.http.codec.cbor.KotlinSerializationCborEncoder;
-import org.springframework.http.codec.json.Jackson2JsonDecoder;
+import org.springframework.http.codec.json.JacksonJsonDecoder;
-import org.springframework.http.codec.json.Jackson2JsonEncoder;
+import org.springframework.http.codec.json.JacksonJsonEncoder;
-import org.springframework.http.codec.json.Jackson2SmileDecoder;
-import org.springframework.http.codec.json.Jackson2SmileEncoder;
 import org.springframework.http.codec.multipart.DefaultPartHttpMessageReader;
 import org.springframework.http.codec.multipart.MultipartHttpMessageReader;
 import org.springframework.http.codec.multipart.MultipartHttpMessageWriter;
@@ -68,6 +66,8 @@ import org.springframework.http.codec.protobuf.KotlinSerializationProtobufDecode
 import org.springframework.http.codec.protobuf.KotlinSerializationProtobufEncoder;
 import org.springframework.http.codec.protobuf.ProtobufDecoder;
 import org.springframework.http.codec.protobuf.ProtobufHttpMessageWriter;
+import org.springframework.http.codec.smile.JacksonSmileDecoder;
+import org.springframework.http.codec.smile.JacksonSmileEncoder;
 import org.springframework.http.codec.xml.Jaxb2XmlDecoder;
 import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
 import org.springframework.util.MimeTypeUtils;
@@ -79,6 +79,7 @@ import static org.springframework.core.ResolvableType.forClass;
  * Tests for {@link ServerCodecConfigurer}.
  *
  * @author Rossen Stoyanchev
+ * @author Sebastien Deleuze
  */
 class ServerCodecConfigurerTests {
 
@@ -104,8 +105,8 @@ class ServerCodecConfigurerTests {
 		assertThat(readers.get(this.index.getAndIncrement()).getClass()).isEqualTo(PartEventHttpMessageReader.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(KotlinSerializationCborDecoder.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(KotlinSerializationProtobufDecoder.class);
-		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jackson2JsonDecoder.class);
+		assertThat(getNextDecoder(readers).getClass()).isEqualTo(JacksonJsonDecoder.class);
-		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jackson2SmileDecoder.class);
+		assertThat(getNextDecoder(readers).getClass()).isEqualTo(JacksonSmileDecoder.class);
 		assertThat(getNextDecoder(readers).getClass()).isEqualTo(Jaxb2XmlDecoder.class);
 		assertStringDecoder(getNextDecoder(readers), false);
 	}
@@ -126,26 +127,26 @@ class ServerCodecConfigurerTests {
 		assertThat(writers.get(this.index.getAndIncrement()).getClass()).isEqualTo(PartHttpMessageWriter.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(KotlinSerializationCborEncoder.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(KotlinSerializationProtobufEncoder.class);
-		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jackson2JsonEncoder.class);
+		assertThat(getNextEncoder(writers).getClass()).isEqualTo(JacksonJsonEncoder.class);
-		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jackson2SmileEncoder.class);
+		assertThat(getNextEncoder(writers).getClass()).isEqualTo(JacksonSmileEncoder.class);
 		assertThat(getNextEncoder(writers).getClass()).isEqualTo(Jaxb2XmlEncoder.class);
 		assertSseWriter(writers);
 		assertStringEncoder(getNextEncoder(writers), false);
 	}
 
 	@Test
-	void jackson2EncoderOverride() {
+	void jacksonEncoderOverride() {
-		Jackson2JsonDecoder decoder = new Jackson2JsonDecoder();
+		JacksonJsonDecoder decoder = new JacksonJsonDecoder();
-		Jackson2JsonEncoder encoder = new Jackson2JsonEncoder();
+		JacksonJsonEncoder encoder = new JacksonJsonEncoder();
-		this.configurer.defaultCodecs().jackson2JsonDecoder(decoder);
+		this.configurer.defaultCodecs().jacksonJsonDecoder(decoder);
-		this.configurer.defaultCodecs().jackson2JsonEncoder(encoder);
+		this.configurer.defaultCodecs().jacksonJsonEncoder(encoder);
 
 		List<HttpMessageReader<?>> readers = this.configurer.getReaders();
-		Jackson2JsonDecoder actualDecoder = findCodec(readers, Jackson2JsonDecoder.class);
+		JacksonJsonDecoder actualDecoder = findCodec(readers, JacksonJsonDecoder.class);
 		assertThat(actualDecoder).isSameAs(decoder);
 
 		List<HttpMessageWriter<?>> writers = this.configurer.getWriters();
-		Jackson2JsonEncoder actualEncoder = findCodec(writers, Jackson2JsonEncoder.class);
+		JacksonJsonEncoder actualEncoder = findCodec(writers, JacksonJsonEncoder.class);
 		assertThat(actualEncoder).isSameAs(encoder);
 		assertThat(findCodec(writers, ServerSentEventHttpMessageWriter.class).getEncoder()).isSameAs(encoder);
 	}
@@ -173,8 +174,8 @@ class ServerCodecConfigurerTests {
 
 		assertThat(((KotlinSerializationCborDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
 		assertThat(((KotlinSerializationProtobufDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
-		assertThat(((Jackson2JsonDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
+		assertThat(((JacksonJsonDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
-		assertThat(((Jackson2SmileDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
+		assertThat(((JacksonSmileDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
 		assertThat(((Jaxb2XmlDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
 		assertThat(((StringDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
 	}
@@ -189,16 +190,16 @@ class ServerCodecConfigurerTests {
 		CodecConfigurer.CustomCodecs customCodecs = this.configurer.customCodecs();
 		customCodecs.register(new ByteArrayDecoder());
 		customCodecs.registerWithDefaultConfig(new ByteArrayDecoder());
-		customCodecs.register(new Jackson2JsonDecoder());
+		customCodecs.register(new JacksonJsonDecoder());
-		customCodecs.registerWithDefaultConfig(new Jackson2JsonDecoder());
+		customCodecs.registerWithDefaultConfig(new JacksonJsonDecoder());
 
 		this.configurer.defaultCodecs().enableLoggingRequestDetails(true);
 
 		List<HttpMessageReader<?>> readers = this.configurer.getReaders();
 		assertThat(((ByteArrayDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(256 * 1024);
 		assertThat(((ByteArrayDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
-		assertThat(((Jackson2JsonDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(256 * 1024);
+		assertThat(((JacksonJsonDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(256 * 1024);
-		assertThat(((Jackson2JsonDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
+		assertThat(((JacksonJsonDecoder) getNextDecoder(readers)).getMaxInMemorySize()).isEqualTo(size);
 	}
 
 	@Test
@@ -235,7 +236,7 @@ class ServerCodecConfigurerTests {
 		ServerCodecConfigurer clone = this.configurer.clone();
 
 		MultipartHttpMessageReader reader = new MultipartHttpMessageReader(new DefaultPartHttpMessageReader());
-		Jackson2JsonEncoder encoder = new Jackson2JsonEncoder();
+		JacksonJsonEncoder encoder = new JacksonJsonEncoder();
 		clone.defaultCodecs().multipartReader(reader);
 		clone.defaultCodecs().serverSentEventEncoder(encoder);
 
@@ -319,7 +320,7 @@ class ServerCodecConfigurerTests {
 		assertThat(writer.getClass()).isEqualTo(ServerSentEventHttpMessageWriter.class);
 		Encoder<?> encoder = ((ServerSentEventHttpMessageWriter) writer).getEncoder();
 		assertThat(encoder).isNotNull();
-		assertThat(encoder.getClass()).isEqualTo(Jackson2JsonEncoder.class);
+		assertThat(encoder.getClass()).isEqualTo(JacksonJsonEncoder.class);
 	}
 
 }

spring-webflux/spring-webflux.gradle

@@ -34,6 +34,8 @@ dependencies {
 	optional("org.jetbrains.kotlin:kotlin-stdlib")
 	optional("org.jetbrains.kotlinx:kotlinx-coroutines-reactor")
 	optional("org.webjars:webjars-locator-lite")
+	optional("tools.jackson.core:jackson-databind")
+	optional("tools.jackson.dataformat:jackson-dataformat-smile")
 	testImplementation(testFixtures(project(":spring-beans")))
 	testImplementation(testFixtures(project(":spring-core")))
 	testImplementation(testFixtures(project(":spring-web")))

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/EntityResponse.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2023 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -33,7 +33,7 @@ import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpStatusCode;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseCookie;
-import org.springframework.http.codec.json.Jackson2CodecSupport;
+import org.springframework.http.codec.JacksonCodecSupport;
 import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.util.MultiValueMap;
 import org.springframework.web.reactive.function.BodyInserter;
@@ -292,7 +292,7 @@ public interface EntityResponse<T> extends ServerResponse {
 		Builder<T> contentType(MediaType contentType);
 
 		/**
-		 * Add a serialization hint like {@link Jackson2CodecSupport#JSON_VIEW_HINT} to
+		 * Add a serialization hint like {@link JacksonCodecSupport#JSON_VIEW_HINT} to
 		 * customize how the body will be serialized.
 		 * @param key the hint key
 		 * @param value the hint value

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/ServerRequest.java

@@ -40,7 +40,7 @@ import org.springframework.http.HttpMethod;
 import org.springframework.http.HttpRange;
 import org.springframework.http.MediaType;
 import org.springframework.http.codec.HttpMessageReader;
-import org.springframework.http.codec.json.Jackson2CodecSupport;
+import org.springframework.http.codec.JacksonCodecSupport;
 import org.springframework.http.codec.multipart.Part;
 import org.springframework.http.server.RequestPath;
 import org.springframework.http.server.reactive.ServerHttpRequest;
@@ -142,7 +142,7 @@ public interface ServerRequest {
 	/**
 	 * Extract the body with the given {@code BodyExtractor} and hints.
 	 * @param extractor the {@code BodyExtractor} that reads from the request
-	 * @param hints the map of hints like {@link Jackson2CodecSupport#JSON_VIEW_HINT}
+	 * @param hints the map of hints like {@link JacksonCodecSupport#JSON_VIEW_HINT}
 	 * to use to customize body extraction
 	 * @param <T> the type of the body returned
 	 * @return the extracted body

spring-webflux/src/main/java/org/springframework/web/reactive/function/server/ServerResponse.java

@@ -40,7 +40,7 @@ import org.springframework.http.HttpStatusCode;
 import org.springframework.http.MediaType;
 import org.springframework.http.ResponseCookie;
 import org.springframework.http.codec.HttpMessageWriter;
-import org.springframework.http.codec.json.Jackson2CodecSupport;
+import org.springframework.http.codec.JacksonCodecSupport;
 import org.springframework.http.server.reactive.ServerHttpResponse;
 import org.springframework.util.MultiValueMap;
 import org.springframework.web.ErrorResponse;
@@ -385,7 +385,7 @@ public interface ServerResponse {
 		BodyBuilder contentType(MediaType contentType);
 
 		/**
-		 * Add a serialization hint like {@link Jackson2CodecSupport#JSON_VIEW_HINT}
+		 * Add a serialization hint like {@link JacksonCodecSupport#JSON_VIEW_HINT}
 		 * to customize how the body will be serialized.
 		 * @param key the hint key
 		 * @param value the hint value

spring-webflux/src/test/java/org/springframework/web/reactive/DispatcherHandlerErrorTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -121,11 +121,12 @@ public class DispatcherHandlerErrorTests {
 		assertThat(response.getStatusCode()).isEqualTo(HttpStatus.NOT_FOUND);
 		assertThat(response.getHeaders().getContentType()).isEqualTo(MediaType.APPLICATION_PROBLEM_JSON);
 		assertThat(response.getBodyAsString().block()).isEqualTo("""
-				{"type":"about:blank",\
+				{\
-				"title":"Not Found",\
-				"status":404,\
 				"detail":"No static resource non-existing.",\
-				"instance":"/resources/non-existing"}\
+				"instance":"\\/resources\\/non-existing",\
+				"status":404,\
+				"title":"Not Found",\
+				"type":"about:blank"}\
 				""");
 	}
 

spring-webflux/src/test/java/org/springframework/web/reactive/function/BodyExtractorsTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -50,7 +50,7 @@ import org.springframework.http.ReactiveHttpInputMessage;
 import org.springframework.http.codec.DecoderHttpMessageReader;
 import org.springframework.http.codec.FormHttpMessageReader;
 import org.springframework.http.codec.HttpMessageReader;
-import org.springframework.http.codec.json.Jackson2JsonDecoder;
+import org.springframework.http.codec.json.JacksonJsonDecoder;
 import org.springframework.http.codec.multipart.DefaultPartHttpMessageReader;
 import org.springframework.http.codec.multipart.FilePart;
 import org.springframework.http.codec.multipart.FormFieldPart;
@@ -66,7 +66,7 @@ import org.springframework.web.testfixture.http.server.reactive.MockServerHttpRe
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 import static org.assertj.core.api.InstanceOfAssertFactories.type;
-import static org.springframework.http.codec.json.Jackson2CodecSupport.JSON_VIEW_HINT;
+import static org.springframework.http.codec.JacksonCodecSupport.JSON_VIEW_HINT;
 
 /**
  * @author Arjen Poutsma
@@ -89,7 +89,7 @@ class BodyExtractorsTests {
 		messageReaders.add(new DecoderHttpMessageReader<>(new ByteBufferDecoder()));
 		messageReaders.add(new DecoderHttpMessageReader<>(StringDecoder.allMimeTypes()));
 		messageReaders.add(new DecoderHttpMessageReader<>(new Jaxb2XmlDecoder()));
-		messageReaders.add(new DecoderHttpMessageReader<>(new Jackson2JsonDecoder()));
+		messageReaders.add(new DecoderHttpMessageReader<>(new JacksonJsonDecoder()));
 		messageReaders.add(new FormHttpMessageReader());
 		DefaultPartHttpMessageReader partReader = new DefaultPartHttpMessageReader();
 		messageReaders.add(partReader);

spring-webflux/src/test/java/org/springframework/web/reactive/function/BodyInsertersTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -56,7 +56,7 @@ import org.springframework.http.codec.HttpMessageWriter;
 import org.springframework.http.codec.ResourceHttpMessageWriter;
 import org.springframework.http.codec.ServerSentEvent;
 import org.springframework.http.codec.ServerSentEventHttpMessageWriter;
-import org.springframework.http.codec.json.Jackson2JsonEncoder;
+import org.springframework.http.codec.json.JacksonJsonEncoder;
 import org.springframework.http.codec.multipart.MultipartHttpMessageWriter;
 import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
 import org.springframework.http.server.reactive.ServerHttpRequest;
@@ -69,7 +69,7 @@ import org.springframework.web.testfixture.http.server.reactive.MockServerHttpRe
 
 import static java.nio.charset.StandardCharsets.UTF_8;
 import static org.assertj.core.api.Assertions.assertThat;
-import static org.springframework.http.codec.json.Jackson2CodecSupport.JSON_VIEW_HINT;
+import static org.springframework.http.codec.JacksonCodecSupport.JSON_VIEW_HINT;
 
 /**
  * @author Arjen Poutsma
@@ -89,7 +89,7 @@ class BodyInsertersTests {
 		messageWriters.add(new EncoderHttpMessageWriter<>(CharSequenceEncoder.textPlainOnly()));
 		messageWriters.add(new ResourceHttpMessageWriter());
 		messageWriters.add(new EncoderHttpMessageWriter<>(new Jaxb2XmlEncoder()));
-		Jackson2JsonEncoder jsonEncoder = new Jackson2JsonEncoder();
+		JacksonJsonEncoder jsonEncoder = new JacksonJsonEncoder();
 		messageWriters.add(new EncoderHttpMessageWriter<>(jsonEncoder));
 		messageWriters.add(new ServerSentEventHttpMessageWriter(jsonEncoder));
 		messageWriters.add(new FormHttpMessageWriter());
@@ -140,7 +140,7 @@ class BodyInsertersTests {
 		StepVerifier.create(result).expectComplete().verify();
 
 		StepVerifier.create(response.getBodyAsString())
-				.expectNext("{\"username\":\"foo\",\"password\":\"bar\"}")
+				.expectNext("{\"password\":\"bar\",\"username\":\"foo\"}")
 				.expectComplete()
 				.verify();
 	}
@@ -169,7 +169,7 @@ class BodyInsertersTests {
 		Mono<Void> result = inserter.insert(response, this.context);
 		StepVerifier.create(result).expectComplete().verify();
 		StepVerifier.create(response.getBodyAsString())
-				.expectNext("{\"username\":\"foo\",\"password\":\"bar\"}")
+				.expectNext("{\"password\":\"bar\",\"username\":\"foo\"}")
 				.expectComplete()
 				.verify();
 	}
@@ -200,7 +200,7 @@ class BodyInsertersTests {
 		Mono<Void> result = inserter.insert(response, this.context);
 		StepVerifier.create(result).expectComplete().verify();
 		StepVerifier.create(response.getBodyAsString())
-				.expectNext("{\"username\":\"foo\",\"password\":\"bar\"}")
+				.expectNext("{\"password\":\"bar\",\"username\":\"foo\"}")
 				.expectComplete()
 				.verify();
 	}

spring-webflux/src/test/java/org/springframework/web/reactive/function/client/WebClientIntegrationTests.java

@@ -767,7 +767,7 @@ class WebClientIntegrationTests {
 		expectRequestCount(1);
 		expectRequest(request -> {
 			assertThat(request.getPath()).isEqualTo("/pojo/capitalize");
-			assertThat(request.getBody().readUtf8()).isEqualTo("{\"foo\":\"foofoo\",\"bar\":\"barbar\"}");
+			assertThat(request.getBody().readUtf8()).isEqualTo("{\"bar\":\"barbar\",\"foo\":\"foofoo\"}");
 			assertThat(request.getHeader(HttpHeaders.CONTENT_LENGTH)).isEqualTo("31");
 			assertThat(request.getHeader(HttpHeaders.ACCEPT)).isEqualTo("application/json");
 			assertThat(request.getHeader(HttpHeaders.CONTENT_TYPE)).isEqualTo("application/json");

spring-webflux/src/test/java/org/springframework/web/reactive/result/method/annotation/RequestMappingExceptionHandlingIntegrationTests.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2024 the original author or authors.
+ * Copyright 2002-2025 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -122,11 +122,11 @@ class RequestMappingExceptionHandlingIntegrationTests extends AbstractRequestMap
 				.isThrownBy(() -> performGet("/no-such-handler", new HttpHeaders(), String.class))
 				.satisfies(ex -> {
 					assertThat(ex.getStatusCode()).isEqualTo(HttpStatus.NOT_FOUND);
-					assertThat(ex.getResponseBodyAsString()).isEqualTo(
+					assertThat(ex.getResponseBodyAsString()).isEqualTo("{" +
-							"{\"type\":\"about:blank\"," +
+							"\"instance\":\"\\/no-such-handler\"," +
-							"\"title\":\"Not Found\"," +
 							"\"status\":404," +
-							"\"instance\":\"/no-such-handler\"}");
+							"\"title\":\"Not Found\"," +
+							"\"type\":\"about:blank\"}");
 				});
 	}
 
@@ -139,11 +139,11 @@ class RequestMappingExceptionHandlingIntegrationTests extends AbstractRequestMap
 				.satisfies(ex -> {
 					assertThat(ex.getStatusCode()).isEqualTo(HttpStatus.BAD_REQUEST);
 					assertThat(ex.getResponseBodyAsString()).isEqualTo("{" +
-							"\"type\":\"about:blank\"," +
-							"\"title\":\"Bad Request\"," +
-							"\"status\":400," +
 							"\"detail\":\"Required query parameter 'q' is not present.\"," +
-							"\"instance\":\"/missing-request-parameter\"}");
+							"\"instance\":\"\\/missing-request-parameter\"," +
+							"\"status\":400," +
+							"\"title\":\"Bad Request\"," +
+							"\"type\":\"about:blank\"}");
 				});
 	}
 

spring-webflux/src/test/java/org/springframework/web/reactive/result/view/HttpMessageWriterViewTests.java

@@ -27,7 +27,7 @@ import reactor.test.StepVerifier;
 
 import org.springframework.core.codec.CharSequenceEncoder;
 import org.springframework.http.MediaType;
-import org.springframework.http.codec.json.Jackson2JsonEncoder;
+import org.springframework.http.codec.json.JacksonJsonEncoder;
 import org.springframework.http.codec.xml.Jaxb2XmlEncoder;
 import org.springframework.web.testfixture.http.server.reactive.MockServerHttpRequest;
 import org.springframework.web.testfixture.server.MockServerWebExchange;
@@ -43,7 +43,7 @@ import static org.assertj.core.api.Assertions.assertThatIllegalStateException;
  */
 class HttpMessageWriterViewTests {
 
-	private HttpMessageWriterView view = new HttpMessageWriterView(new Jackson2JsonEncoder());
+	private HttpMessageWriterView view = new HttpMessageWriterView(new JacksonJsonEncoder());
 
 	private final Map<String, Object> model = new HashMap<>();
 

spring-webflux/src/test/kotlin/org/springframework/web/reactive/result/method/annotation/MessageWriterResultHandlerKotlinTests.kt

@@ -25,7 +25,7 @@ import org.springframework.http.MediaType
 import org.springframework.http.ResponseEntity
 import org.springframework.http.codec.EncoderHttpMessageWriter
 import org.springframework.http.codec.HttpMessageWriter
-import org.springframework.http.codec.json.Jackson2JsonEncoder
+import org.springframework.http.codec.json.JacksonJsonEncoder
 import org.springframework.http.codec.json.KotlinSerializationJsonEncoder
 import org.springframework.util.ObjectUtils
 import org.springframework.web.bind.annotation.GetMapping
@@ -54,7 +54,7 @@ class MessageWriterResultHandlerKotlinTests {
 		val writerList = if (ObjectUtils.isEmpty(writers)) {
 			listOf(
 				EncoderHttpMessageWriter(KotlinSerializationJsonEncoder()),
-				EncoderHttpMessageWriter(Jackson2JsonEncoder())
+				EncoderHttpMessageWriter(JacksonJsonEncoder())
 			)
 		} else {
 			listOf(*writers)