diff --git a/gradle/spring-module.gradle b/gradle/spring-module.gradle
index 47c2d66b3d..7596c4b39c 100644
--- a/gradle/spring-module.gradle
+++ b/gradle/spring-module.gradle
@@ -13,7 +13,7 @@ dependencies {
 	jmh 'org.openjdk.jmh:jmh-generator-annprocess:1.37'
 	jmh 'org.openjdk.jmh:jmh-generator-bytecode:1.37'
 	jmh 'net.sf.jopt-simple:jopt-simple'
-	errorprone 'com.uber.nullaway:nullaway:0.12.3'
+	errorprone 'com.uber.nullaway:nullaway:0.12.4'
 	errorprone 'com.google.errorprone:error_prone_core:2.36.0'
 }
 
diff --git a/spring-context-support/src/main/java/org/springframework/cache/jcache/config/AbstractJCacheConfiguration.java b/spring-context-support/src/main/java/org/springframework/cache/jcache/config/AbstractJCacheConfiguration.java
index dc31ac838f..6237426b73 100644
--- a/spring-context-support/src/main/java/org/springframework/cache/jcache/config/AbstractJCacheConfiguration.java
+++ b/spring-context-support/src/main/java/org/springframework/cache/jcache/config/AbstractJCacheConfiguration.java
@@ -41,11 +41,11 @@ import org.springframework.context.annotation.Role;
 @Configuration(proxyBeanMethods = false)
 public abstract class AbstractJCacheConfiguration extends AbstractCachingConfiguration {
 
-	protected @Nullable Supplier<? extends @Nullable CacheResolver> exceptionCacheResolver;
+	protected @Nullable Supplier<@Nullable CacheResolver> exceptionCacheResolver;
 
 
 	@Override
-	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1126
+	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1128
 	protected void useCachingConfigurer(CachingConfigurerSupplier cachingConfigurerSupplier) {
 		super.useCachingConfigurer(cachingConfigurerSupplier);
 		this.exceptionCacheResolver = cachingConfigurerSupplier.adapt(config -> {
diff --git a/spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/DefaultJCacheOperationSource.java b/spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/DefaultJCacheOperationSource.java
index e71381f871..ed2a14e315 100644
--- a/spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/DefaultJCacheOperationSource.java
+++ b/spring-context-support/src/main/java/org/springframework/cache/jcache/interceptor/DefaultJCacheOperationSource.java
@@ -79,8 +79,8 @@ public class DefaultJCacheOperationSource extends AnnotationJCacheOperationSourc
 	 * @since 5.1
 	 */
 	public DefaultJCacheOperationSource(
-			@Nullable Supplier<? extends @Nullable CacheManager> cacheManager, @Nullable Supplier<? extends @Nullable CacheResolver> cacheResolver,
-			@Nullable Supplier<? extends @Nullable CacheResolver> exceptionCacheResolver, @Nullable Supplier<? extends @Nullable KeyGenerator> keyGenerator) {
+			@Nullable Supplier<@Nullable CacheManager> cacheManager, @Nullable Supplier<@Nullable CacheResolver> cacheResolver,
+			@Nullable Supplier<@Nullable CacheResolver> exceptionCacheResolver, @Nullable Supplier<@Nullable KeyGenerator> keyGenerator) {
 
 		this.cacheManager = SingletonSupplier.ofNullable(cacheManager);
 		this.cacheResolver = SingletonSupplier.ofNullable(cacheResolver);
diff --git a/spring-context/src/main/java/org/springframework/cache/annotation/AbstractCachingConfiguration.java b/spring-context/src/main/java/org/springframework/cache/annotation/AbstractCachingConfiguration.java
index b7939d7494..824773f892 100644
--- a/spring-context/src/main/java/org/springframework/cache/annotation/AbstractCachingConfiguration.java
+++ b/spring-context/src/main/java/org/springframework/cache/annotation/AbstractCachingConfiguration.java
@@ -50,13 +50,13 @@ public abstract class AbstractCachingConfiguration implements ImportAware {
 
 	protected @Nullable AnnotationAttributes enableCaching;
 
-	protected @Nullable Supplier<? extends @Nullable CacheManager> cacheManager;
+	protected @Nullable Supplier<@Nullable CacheManager> cacheManager;
 
-	protected @Nullable Supplier<? extends @Nullable CacheResolver> cacheResolver;
+	protected @Nullable Supplier<@Nullable CacheResolver> cacheResolver;
 
-	protected @Nullable Supplier<? extends @Nullable KeyGenerator> keyGenerator;
+	protected @Nullable Supplier<@Nullable KeyGenerator> keyGenerator;
 
-	protected @Nullable Supplier<? extends @Nullable CacheErrorHandler> errorHandler;
+	protected @Nullable Supplier<@Nullable CacheErrorHandler> errorHandler;
 
 
 	@Override
@@ -70,9 +70,8 @@ public abstract class AbstractCachingConfiguration implements ImportAware {
 	}
 
 	@Autowired
-	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1126
 	void setConfigurers(ObjectProvider<CachingConfigurer> configurers) {
-		Supplier<? extends @Nullable CachingConfigurer> configurer = () -> {
+		Supplier<@Nullable CachingConfigurer> configurer = () -> {
 			List<CachingConfigurer> candidates = configurers.stream().toList();
 			if (CollectionUtils.isEmpty(candidates)) {
 				return null;
@@ -91,7 +90,7 @@ public abstract class AbstractCachingConfiguration implements ImportAware {
 	/**
 	 * Extract the configuration from the nominated {@link CachingConfigurer}.
 	 */
-	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1126
+	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1128
 	protected void useCachingConfigurer(CachingConfigurerSupplier cachingConfigurerSupplier) {
 		this.cacheManager = cachingConfigurerSupplier.adapt(CachingConfigurer::cacheManager);
 		this.cacheResolver = cachingConfigurerSupplier.adapt(CachingConfigurer::cacheResolver);
@@ -104,7 +103,7 @@ public abstract class AbstractCachingConfiguration implements ImportAware {
 
 		private final SingletonSupplier<CachingConfigurer> supplier;
 
-		public CachingConfigurerSupplier(Supplier<? extends @Nullable CachingConfigurer> supplier) {
+		public CachingConfigurerSupplier(Supplier<@Nullable CachingConfigurer> supplier) {
 			this.supplier = SingletonSupplier.ofNullable(supplier);
 		}
 
@@ -117,7 +116,7 @@ public abstract class AbstractCachingConfiguration implements ImportAware {
 		 * @param <T> the type of the supplier
 		 * @return another supplier mapped by the specified function
 		 */
-		public <T> Supplier<@Nullable T> adapt(Function<CachingConfigurer, ? extends @Nullable T> provider) {
+		public <T> Supplier<@Nullable T> adapt(Function<CachingConfigurer, @Nullable T> provider) {
 			return () -> {
 				CachingConfigurer cachingConfigurer = this.supplier.get();
 				return (cachingConfigurer != null ? provider.apply(cachingConfigurer) : null);
diff --git a/spring-context/src/main/java/org/springframework/jmx/export/assembler/AbstractReflectiveMBeanInfoAssembler.java b/spring-context/src/main/java/org/springframework/jmx/export/assembler/AbstractReflectiveMBeanInfoAssembler.java
index 564a68f0e9..1f32cd256d 100644
--- a/spring-context/src/main/java/org/springframework/jmx/export/assembler/AbstractReflectiveMBeanInfoAssembler.java
+++ b/spring-context/src/main/java/org/springframework/jmx/export/assembler/AbstractReflectiveMBeanInfoAssembler.java
@@ -506,7 +506,6 @@ public abstract class AbstractReflectiveMBeanInfoAssembler extends AbstractMBean
 	 * of the {@code MBeanExporter}
 	 * @return the {@code MBeanParameterInfo} array
 	 */
-	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1127
 	protected MBeanParameterInfo[] getOperationParameters(Method method, String beanKey) {
 		ParameterNameDiscoverer paramNameDiscoverer = getParameterNameDiscoverer();
 		@Nullable String[] paramNames = (paramNameDiscoverer != null ? paramNameDiscoverer.getParameterNames(method) : null);
diff --git a/spring-context/src/main/java/org/springframework/scheduling/annotation/AbstractAsyncConfiguration.java b/spring-context/src/main/java/org/springframework/scheduling/annotation/AbstractAsyncConfiguration.java
index e0245db3da..b5b144210b 100644
--- a/spring-context/src/main/java/org/springframework/scheduling/annotation/AbstractAsyncConfiguration.java
+++ b/spring-context/src/main/java/org/springframework/scheduling/annotation/AbstractAsyncConfiguration.java
@@ -67,7 +67,7 @@ public abstract class AbstractAsyncConfiguration implements ImportAware {
 	 * Collect any {@link AsyncConfigurer} beans through autowiring.
 	 */
 	@Autowired
-	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1126
+	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1128
 	void setConfigurers(ObjectProvider<AsyncConfigurer> configurers) {
 		SingletonSupplier<AsyncConfigurer> configurer = SingletonSupplier.ofNullable(() -> {
 			List<AsyncConfigurer> candidates = configurers.stream().toList();
diff --git a/spring-core/src/main/java/org/springframework/util/function/SingletonSupplier.java b/spring-core/src/main/java/org/springframework/util/function/SingletonSupplier.java
index c5b2ef3752..9a7c59b15c 100644
--- a/spring-core/src/main/java/org/springframework/util/function/SingletonSupplier.java
+++ b/spring-core/src/main/java/org/springframework/util/function/SingletonSupplier.java
@@ -162,7 +162,7 @@ public class SingletonSupplier<T> implements Supplier<@Nullable T> {
 	 * @return the singleton supplier, or {@code null} if the instance supplier was {@code null}
 	 */
 	@Contract("null -> null; !null -> !null")
-	public static <T> @Nullable SingletonSupplier<T> ofNullable(@Nullable Supplier<? extends @Nullable T> supplier) {
+	public static <T> @Nullable SingletonSupplier<T> ofNullable(@Nullable Supplier<@Nullable T> supplier) {
 		return (supplier != null ? new SingletonSupplier<>(supplier) : null);
 	}
 
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/service/RSocketServiceMethod.java b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/service/RSocketServiceMethod.java
index 36c59cce41..f15fa36790 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/rsocket/service/RSocketServiceMethod.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/rsocket/service/RSocketServiceMethod.java
@@ -21,6 +21,7 @@ import java.time.Duration;
 import java.util.Iterator;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.Optional;
 import java.util.function.Function;
 
@@ -166,7 +167,7 @@ final class RSocketServiceMethod {
 						((Mono<?>) responsePublisher).blockOptional());
 			}
 			else {
-				return (blockTimeout != null ?
+				return Objects.requireNonNull(blockTimeout != null ?
 						((Mono<?>) responsePublisher).block(blockTimeout) :
 						((Mono<?>) responsePublisher).block());
 			}
diff --git a/spring-orm/src/main/java/org/springframework/orm/hibernate5/SpringSessionContext.java b/spring-orm/src/main/java/org/springframework/orm/hibernate5/SpringSessionContext.java
index d57ca19422..144d3f0c8c 100644
--- a/spring-orm/src/main/java/org/springframework/orm/hibernate5/SpringSessionContext.java
+++ b/spring-orm/src/main/java/org/springframework/orm/hibernate5/SpringSessionContext.java
@@ -60,7 +60,7 @@ public class SpringSessionContext implements CurrentSessionContext {
 	public SpringSessionContext(SessionFactoryImplementor sessionFactory) {
 		this.sessionFactory = sessionFactory;
 		try {
-			JtaPlatform jtaPlatform = sessionFactory.getServiceRegistry().getService(JtaPlatform.class);
+			JtaPlatform jtaPlatform = sessionFactory.getServiceRegistry().requireService(JtaPlatform.class);
 			this.transactionManager = jtaPlatform.retrieveTransactionManager();
 			if (this.transactionManager != null) {
 				this.jtaSessionContext = new SpringJtaSessionContext(sessionFactory);
diff --git a/spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java b/spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java
index 78fa9e2535..8bfdbdb7f0 100644
--- a/spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java
+++ b/spring-web/src/main/java/org/springframework/web/method/support/InvocableHandlerMethod.java
@@ -20,6 +20,7 @@ import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
 import java.util.Arrays;
 import java.util.Map;
+import java.util.Objects;
 
 import kotlin.Unit;
 import kotlin.jvm.JvmClassMappingKt;
@@ -317,7 +318,7 @@ public class InvocableHandlerMethod extends HandlerMethod {
 							KType type = parameter.getType();
 							if (!(type.isMarkedNullable() && arg == null) && type.getClassifier() instanceof KClass<?> kClass
 									&& KotlinDetector.isInlineClass(JvmClassMappingKt.getJavaClass(kClass))) {
-								KFunction<?> constructor = KClasses.getPrimaryConstructor(kClass);
+								KFunction<?> constructor = Objects.requireNonNull(KClasses.getPrimaryConstructor(kClass));
 								if (!KCallablesJvm.isAccessible(constructor)) {
 									KCallablesJvm.setAccessible(constructor, true);
 								}
diff --git a/spring-web/src/main/java/org/springframework/web/service/invoker/AbstractReactorHttpExchangeAdapter.java b/spring-web/src/main/java/org/springframework/web/service/invoker/AbstractReactorHttpExchangeAdapter.java
index 184a6e4a5e..4ab6c7bda3 100644
--- a/spring-web/src/main/java/org/springframework/web/service/invoker/AbstractReactorHttpExchangeAdapter.java
+++ b/spring-web/src/main/java/org/springframework/web/service/invoker/AbstractReactorHttpExchangeAdapter.java
@@ -94,6 +94,7 @@ public abstract class AbstractReactorHttpExchangeAdapter implements ReactorHttpE
 	}
 
 	@Override
+	@Nullable
 	public <T> T exchangeForBody(HttpRequestValues requestValues, ParameterizedTypeReference<T> bodyType) {
 		return (this.blockTimeout != null ?
 				exchangeForBodyMono(requestValues, bodyType).block(this.blockTimeout) :
diff --git a/spring-web/src/main/java/org/springframework/web/util/DefaultUriBuilderFactory.java b/spring-web/src/main/java/org/springframework/web/util/DefaultUriBuilderFactory.java
index 1826b78b10..6302f8d176 100644
--- a/spring-web/src/main/java/org/springframework/web/util/DefaultUriBuilderFactory.java
+++ b/spring-web/src/main/java/org/springframework/web/util/DefaultUriBuilderFactory.java
@@ -140,7 +140,6 @@ public class DefaultUriBuilderFactory implements UriBuilderFactory {
 	 * with a Map of variables.
 	 * @param defaultUriVariables default URI variable values
 	 */
-	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1126
 	public void setDefaultUriVariables(@Nullable Map<String, ? extends @Nullable Object> defaultUriVariables) {
 		if (defaultUriVariables != null) {
 			if (this.defaultUriVariables == null) {
@@ -432,7 +431,6 @@ public class DefaultUriBuilderFactory implements UriBuilderFactory {
 		}
 
 		@Override
-		@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1126
 		public URI build(Map<String, ?> uriVars) {
 			if (!CollectionUtils.isEmpty(defaultUriVariables)) {
 				Map<String, Object> map = new HashMap<>(defaultUriVariables.size() + uriVars.size());
@@ -448,7 +446,6 @@ public class DefaultUriBuilderFactory implements UriBuilderFactory {
 		}
 
 		@Override
-		@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1126
 		public URI build(@Nullable Object... uriVars) {
 			if (ObjectUtils.isEmpty(uriVars) && !CollectionUtils.isEmpty(defaultUriVariables)) {
 				return build(Collections.emptyMap());
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultClientResponse.java b/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultClientResponse.java
index c7cc077738..3c9c1c5145 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultClientResponse.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/DefaultClientResponse.java
@@ -232,8 +232,7 @@ class DefaultClientResponse implements ClientResponse {
 				});
 	}
 
-	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1126
-	private Function<ResolvableType, ? extends @Nullable Object> initDecodeFunction(byte[] body, @Nullable MediaType contentType) {
+	private Function<ResolvableType, @Nullable Object> initDecodeFunction(byte[] body, @Nullable MediaType contentType) {
 		return targetType -> {
 			if (ObjectUtils.isEmpty(body)) {
 				return null;
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/result/condition/CompositeRequestCondition.java b/spring-webflux/src/main/java/org/springframework/web/reactive/result/condition/CompositeRequestCondition.java
index d3e4ce35d9..e3d297e52d 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/result/condition/CompositeRequestCondition.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/result/condition/CompositeRequestCondition.java
@@ -92,7 +92,6 @@ public class CompositeRequestCondition extends AbstractRequestCondition<Composit
 	}
 
 	@Override
-	@SuppressWarnings("NullAway") // https://github.com/uber/NullAway/issues/1126
 	protected Collection<? extends @Nullable Object> getContent() {
 		return (!isEmpty() ? getConditions() : Collections.emptyList());
 	}
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/InvocableHandlerMethod.java b/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/InvocableHandlerMethod.java
index 086bdb28aa..59d6a848aa 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/InvocableHandlerMethod.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/InvocableHandlerMethod.java
@@ -23,6 +23,7 @@ import java.lang.reflect.Type;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.Map;
+import java.util.Objects;
 import java.util.stream.Stream;
 
 import kotlin.Unit;
@@ -355,7 +356,7 @@ public class InvocableHandlerMethod extends HandlerMethod {
 								KType type = parameter.getType();
 								if (!(type.isMarkedNullable() && arg == null) && type.getClassifier() instanceof KClass<?> kClass
 										&& KotlinDetector.isInlineClass(JvmClassMappingKt.getJavaClass(kClass))) {
-									KFunction<?> constructor = KClasses.getPrimaryConstructor(kClass);
+									KFunction<?> constructor = Objects.requireNonNull(KClasses.getPrimaryConstructor(kClass));
 									if (!KCallablesJvm.isAccessible(constructor)) {
 										KCallablesJvm.setAccessible(constructor, true);
 									}
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/AbstractNamedValueSyncArgumentResolver.java b/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/AbstractNamedValueSyncArgumentResolver.java
index 7806237ee8..b956bdc55e 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/AbstractNamedValueSyncArgumentResolver.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/result/method/annotation/AbstractNamedValueSyncArgumentResolver.java
@@ -16,6 +16,8 @@
 
 package org.springframework.web.reactive.result.method.annotation;
 
+import java.util.Objects;
+
 import org.jspecify.annotations.Nullable;
 import reactor.core.publisher.Mono;
 
@@ -69,7 +71,7 @@ public abstract class AbstractNamedValueSyncArgumentResolver extends AbstractNam
 			MethodParameter parameter, BindingContext context, ServerWebExchange exchange) {
 
 		// This won't block since resolveName below doesn't
-		return resolveArgument(parameter, context, exchange).block();
+		return Objects.requireNonNull(resolveArgument(parameter, context, exchange).block());
 	}
 
 	@Override