diff --git a/spring-core/src/main/java/org/springframework/core/PriorityOrdered.java b/spring-core/src/main/java/org/springframework/core/PriorityOrdered.java
index 2090cd35f9..aac7916370 100644
--- a/spring-core/src/main/java/org/springframework/core/PriorityOrdered.java
+++ b/spring-core/src/main/java/org/springframework/core/PriorityOrdered.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -42,7 +42,6 @@ package org.springframework.core;
  * @author Sam Brannen
  * @since 2.5
  * @see org.springframework.beans.factory.config.PropertyOverrideConfigurer
- * @see org.springframework.beans.factory.config.PropertyPlaceholderConfigurer
  */
 public interface PriorityOrdered extends Ordered {
 }
diff --git a/spring-core/src/main/java/org/springframework/core/ReactiveTypeDescriptor.java b/spring-core/src/main/java/org/springframework/core/ReactiveTypeDescriptor.java
index 5e37afabf0..d056613e94 100644
--- a/spring-core/src/main/java/org/springframework/core/ReactiveTypeDescriptor.java
+++ b/spring-core/src/main/java/org/springframework/core/ReactiveTypeDescriptor.java
@@ -130,7 +130,7 @@ public final class ReactiveTypeDescriptor {
 
 
 	/**
-	 * Descriptor for a reactive type that can produce 0..N values.
+	 * Descriptor for a reactive type that can produce {@code 0..N} values.
 	 * @param type the reactive type
 	 * @param emptySupplier a supplier of an empty-value instance of the reactive type
 	 */
diff --git a/spring-core/src/main/java/org/springframework/core/ResolvableType.java b/spring-core/src/main/java/org/springframework/core/ResolvableType.java
index 6db94aa366..510b191c9a 100644
--- a/spring-core/src/main/java/org/springframework/core/ResolvableType.java
+++ b/spring-core/src/main/java/org/springframework/core/ResolvableType.java
@@ -758,7 +758,7 @@ public class ResolvableType implements Serializable {
 	 * Convenience method that will {@link #getGenerics() get} and
 	 * {@link #resolve() resolve} generic parameters.
 	 * @return an array of resolved generic parameters (the resulting array
-	 * will never be {@code null}, but it may contain {@code null} elements})
+	 * will never be {@code null}, but it may contain {@code null} elements)
 	 * @see #getGenerics()
 	 * @see #resolve()
 	 */
diff --git a/spring-core/src/main/java/org/springframework/core/SpringProperties.java b/spring-core/src/main/java/org/springframework/core/SpringProperties.java
index 9c53470a82..3cb1cd51eb 100644
--- a/spring-core/src/main/java/org/springframework/core/SpringProperties.java
+++ b/spring-core/src/main/java/org/springframework/core/SpringProperties.java
@@ -39,7 +39,6 @@ import org.springframework.lang.Nullable;
  * @author Juergen Hoeller
  * @since 3.2.7
  * @see org.springframework.beans.StandardBeanInfoFactory#IGNORE_BEANINFO_PROPERTY_NAME
- * @see org.springframework.context.index.CandidateComponentsIndexLoader#IGNORE_INDEX
  * @see org.springframework.core.env.AbstractEnvironment#IGNORE_GETENV_PROPERTY_NAME
  * @see org.springframework.expression.spel.SpelParserConfiguration#SPRING_EXPRESSION_COMPILER_MODE_PROPERTY_NAME
  * @see org.springframework.jdbc.core.StatementCreatorUtils#IGNORE_GETPARAMETERTYPE_PROPERTY_NAME
diff --git a/spring-core/src/main/java/org/springframework/core/annotation/AnnotationsScanner.java b/spring-core/src/main/java/org/springframework/core/annotation/AnnotationsScanner.java
index 61fea06852..a98c005f37 100644
--- a/spring-core/src/main/java/org/springframework/core/annotation/AnnotationsScanner.java
+++ b/spring-core/src/main/java/org/springframework/core/annotation/AnnotationsScanner.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -98,7 +98,6 @@ abstract class AnnotationsScanner {
 	}
 
 	@Nullable
-	@SuppressWarnings("deprecation")
 	private static <C, R> R processClass(C context, Class<?> source, SearchStrategy searchStrategy,
 			Predicate<Class<?>> searchEnclosingClass, AnnotationsProcessor<C, R> processor) {
 
@@ -237,7 +236,6 @@ abstract class AnnotationsScanner {
 	}
 
 	@Nullable
-	@SuppressWarnings("deprecation")
 	private static <C, R> R processMethod(C context, Method source,
 			SearchStrategy searchStrategy, AnnotationsProcessor<C, R> processor) {
 
@@ -509,7 +507,6 @@ abstract class AnnotationsScanner {
 		return (type.getName().startsWith("java.") || type == Ordered.class);
 	}
 
-	@SuppressWarnings("deprecation")
 	private static boolean isWithoutHierarchy(AnnotatedElement source, SearchStrategy searchStrategy,
 			Predicate<Class<?>> searchEnclosingClass) {
 
diff --git a/spring-core/src/main/java/org/springframework/core/codec/AbstractDataBufferDecoder.java b/spring-core/src/main/java/org/springframework/core/codec/AbstractDataBufferDecoder.java
index 0fd5870b2a..9bcb6430f0 100644
--- a/spring-core/src/main/java/org/springframework/core/codec/AbstractDataBufferDecoder.java
+++ b/spring-core/src/main/java/org/springframework/core/codec/AbstractDataBufferDecoder.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2019 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -45,7 +45,6 @@ import org.springframework.util.MimeType;
  * @since 5.0
  * @param <T> the element type
  */
-@SuppressWarnings("deprecation")
 public abstract class AbstractDataBufferDecoder<T> extends AbstractDecoder<T> {
 
 	private int maxInMemorySize = 256 * 1024;
diff --git a/spring-core/src/main/java/org/springframework/core/convert/support/StringToArrayConverter.java b/spring-core/src/main/java/org/springframework/core/convert/support/StringToArrayConverter.java
index 038a82d742..7cece80cf8 100644
--- a/spring-core/src/main/java/org/springframework/core/convert/support/StringToArrayConverter.java
+++ b/spring-core/src/main/java/org/springframework/core/convert/support/StringToArrayConverter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2017 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -29,7 +29,7 @@ import org.springframework.util.StringUtils;
 
 /**
  * Converts a comma-delimited String to an Array.
- * Only matches if String.class can be converted to the target array element type.
+ * Only matches if {@code String.class} can be converted to the target array element type.
  *
  * @author Keith Donald
  * @author Juergen Hoeller
diff --git a/spring-core/src/main/java/org/springframework/core/env/CommandLinePropertySource.java b/spring-core/src/main/java/org/springframework/core/env/CommandLinePropertySource.java
index c317f5e2dc..6a5cd246a2 100644
--- a/spring-core/src/main/java/org/springframework/core/env/CommandLinePropertySource.java
+++ b/spring-core/src/main/java/org/springframework/core/env/CommandLinePropertySource.java
@@ -25,9 +25,8 @@ import org.springframework.util.StringUtils;
 /**
  * Abstract base class for {@link PropertySource} implementations backed by command line
  * arguments. The parameterized type {@code T} represents the underlying source of command
- * line options. This may be as simple as a String array in the case of
- * {@link SimpleCommandLinePropertySource}, or specific to a particular API such as JOpt's
- * {@code OptionSet} in the case of {@link JOptCommandLinePropertySource}.
+ * line options. For instance, {@link SimpleCommandLinePropertySource} uses  a String
+ * array.
  *
  * <h3>Purpose and General Usage</h3>
  *
@@ -203,7 +202,6 @@ import org.springframework.util.StringUtils;
  * @param <T> the source type
  * @see PropertySource
  * @see SimpleCommandLinePropertySource
- * @see JOptCommandLinePropertySource
  */
 public abstract class CommandLinePropertySource<T> extends EnumerablePropertySource<T> {
 
diff --git a/spring-core/src/main/java/org/springframework/core/env/SimpleCommandLinePropertySource.java b/spring-core/src/main/java/org/springframework/core/env/SimpleCommandLinePropertySource.java
index 48015092c1..3efb89a327 100644
--- a/spring-core/src/main/java/org/springframework/core/env/SimpleCommandLinePropertySource.java
+++ b/spring-core/src/main/java/org/springframework/core/env/SimpleCommandLinePropertySource.java
@@ -74,15 +74,13 @@ import org.springframework.util.StringUtils;
  *
  * <h3>Beyond the basics</h3>
  *
- * <p>When more fully-featured command line parsing is necessary, consider using
- * the provided {@link JOptCommandLinePropertySource}, or implement your own
- * {@code CommandLinePropertySource} against the command line parsing library of your
- * choice.
+ * <p>When more fully-featured command line parsing is necessary, consider
+ * implementing your own {@code CommandLinePropertySource} against the command line
+ * parsing library of your choice.
  *
  * @author Chris Beams
  * @since 3.1
  * @see CommandLinePropertySource
- * @see JOptCommandLinePropertySource
  */
 public class SimpleCommandLinePropertySource extends CommandLinePropertySource<CommandLineArgs> {
 
diff --git a/spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java b/spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java
index 16cd5d5115..0d7b1d6393 100644
--- a/spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java
+++ b/spring-core/src/main/java/org/springframework/core/io/buffer/DataBufferUtils.java
@@ -829,7 +829,7 @@ public abstract class DataBufferUtils {
 	 */
 	private static class SingleByteMatcher implements NestedMatcher {
 
-		static SingleByteMatcher NEWLINE_MATCHER = new SingleByteMatcher(new byte[] {10});
+		static final SingleByteMatcher NEWLINE_MATCHER = new SingleByteMatcher(new byte[] {10});
 
 		private final byte[] delimiter;
 
diff --git a/spring-core/src/main/java/org/springframework/core/io/buffer/LimitedDataBufferList.java b/spring-core/src/main/java/org/springframework/core/io/buffer/LimitedDataBufferList.java
index 62fa289e7c..d089fc4ec9 100644
--- a/spring-core/src/main/java/org/springframework/core/io/buffer/LimitedDataBufferList.java
+++ b/spring-core/src/main/java/org/springframework/core/io/buffer/LimitedDataBufferList.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2021 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -95,7 +95,7 @@ public class LimitedDataBufferList extends ArrayList<DataBuffer> {
 	}
 
 	private void raiseLimitException() {
-		// Do not release here, it's likely down via doOnDiscard..
+		// Do not release here, it's likely done via doOnDiscard
 		throw new DataBufferLimitException(
 				"Exceeded limit on max bytes to buffer : " + this.maxByteCount);
 	}
diff --git a/spring-core/src/main/java/org/springframework/core/serializer/DefaultDeserializer.java b/spring-core/src/main/java/org/springframework/core/serializer/DefaultDeserializer.java
index 07bf246b05..3096daf961 100644
--- a/spring-core/src/main/java/org/springframework/core/serializer/DefaultDeserializer.java
+++ b/spring-core/src/main/java/org/springframework/core/serializer/DefaultDeserializer.java
@@ -65,7 +65,6 @@ public class DefaultDeserializer implements Deserializer<Object> {
 	 * @see ObjectInputStream#readObject()
 	 */
 	@Override
-	@SuppressWarnings("resource")
 	public Object deserialize(InputStream inputStream) throws IOException {
 		ObjectInputStream objectInputStream = new ConfigurableObjectInputStream(inputStream, this.classLoader);
 		try {
diff --git a/spring-core/src/main/java/org/springframework/core/task/support/ExecutorServiceAdapter.java b/spring-core/src/main/java/org/springframework/core/task/support/ExecutorServiceAdapter.java
index 9c8958d214..e1860006a5 100644
--- a/spring-core/src/main/java/org/springframework/core/task/support/ExecutorServiceAdapter.java
+++ b/spring-core/src/main/java/org/springframework/core/task/support/ExecutorServiceAdapter.java
@@ -34,7 +34,7 @@ import org.springframework.util.Assert;
  *
  * <p><b>NOTE:</b> This ExecutorService adapter does <em>not</em> support the
  * lifecycle methods in the {@code java.util.concurrent.ExecutorService} API
- * ("shutdown()" etc), similar to a server-wide {@code ManagedExecutorService}
+ * ("shutdown()" etc.), similar to a server-wide {@code ManagedExecutorService}
  * in a Jakarta EE environment. The lifecycle is always up to the backend pool,
  * with this adapter acting as an access-only proxy for that target pool.
  *
diff --git a/spring-core/src/main/java/org/springframework/core/type/classreading/MergedAnnotationReadingVisitor.java b/spring-core/src/main/java/org/springframework/core/type/classreading/MergedAnnotationReadingVisitor.java
index 540ee3546a..1a2bfe899d 100644
--- a/spring-core/src/main/java/org/springframework/core/type/classreading/MergedAnnotationReadingVisitor.java
+++ b/spring-core/src/main/java/org/springframework/core/type/classreading/MergedAnnotationReadingVisitor.java
@@ -94,7 +94,7 @@ class MergedAnnotationReadingVisitor<A extends Annotation> extends AnnotationVis
 	@Override
 	public void visitEnd() {
 		Map<String, Object> compactedAttributes =
-				(this.attributes.size() == 0 ? Collections.emptyMap() : this.attributes);
+				(this.attributes.isEmpty() ? Collections.emptyMap() : this.attributes);
 		MergedAnnotation<A> annotation = MergedAnnotation.of(
 				this.classLoader, this.source, this.annotationType, compactedAttributes);
 		this.consumer.accept(annotation);
diff --git a/spring-core/src/main/java/org/springframework/core/type/filter/AbstractTypeHierarchyTraversingFilter.java b/spring-core/src/main/java/org/springframework/core/type/filter/AbstractTypeHierarchyTraversingFilter.java
index 96874edb2e..145450bf57 100644
--- a/spring-core/src/main/java/org/springframework/core/type/filter/AbstractTypeHierarchyTraversingFilter.java
+++ b/spring-core/src/main/java/org/springframework/core/type/filter/AbstractTypeHierarchyTraversingFilter.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2022 the original author or authors.
+ * Copyright 2002-2023 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.
@@ -73,7 +73,7 @@ public abstract class AbstractTypeHierarchyTraversingFilter implements TypeFilte
 				// Optimization to avoid creating ClassReader for superclass.
 				Boolean superClassMatch = matchSuperClass(superClassName);
 				if (superClassMatch != null) {
-					if (superClassMatch.booleanValue()) {
+					if (superClassMatch) {
 						return true;
 					}
 				}
@@ -99,7 +99,7 @@ public abstract class AbstractTypeHierarchyTraversingFilter implements TypeFilte
 				// Optimization to avoid creating ClassReader for superclass
 				Boolean interfaceMatch = matchInterface(ifc);
 				if (interfaceMatch != null) {
-					if (interfaceMatch.booleanValue()) {
+					if (interfaceMatch) {
 						return true;
 					}
 				}