Fix [serial] compiler warnings

Fix serialization warnings by applying @SuppressWarnings("serial")
when appropriate.

In certain cases and for unknown reasons, a correctly-placed
@SuppressWarnings("serial") annotation will fix the warning at the
javac level (i.e. the Gradle command-line), but will produce an
"unnecessary @SuppressWarnings" warning within Eclipse. In these
cases, a private static final serialVersionUID field has been added
with the default value of 1L.

spring-core/src/main/java/org/springframework/core/AttributeAccessorSupport.java

@@ -32,6 +32,7 @@ import org.springframework.util.Assert;
  * @author Juergen Hoeller
  * @since 2.0
  */
+@SuppressWarnings("serial")
 public abstract class AttributeAccessorSupport implements AttributeAccessor, Serializable {
 
 	/** Map with String keys and Object values */

spring-core/src/main/java/org/springframework/core/CollectionFactory.java

@@ -334,6 +334,7 @@ public abstract class CollectionFactory {
 	 * ConcurrentMap adapter for the JDK ConcurrentHashMap class.
 	 */
 	@Deprecated
+	@SuppressWarnings("serial")
 	private static class JdkConcurrentHashMap extends ConcurrentHashMap implements ConcurrentMap {
 
 		private JdkConcurrentHashMap(int initialCapacity) {

spring-core/src/main/java/org/springframework/core/ConstantException.java

@@ -24,6 +24,7 @@ package org.springframework.core;
  * @since 28.04.2003
  * @see org.springframework.core.Constants
  */
+@SuppressWarnings("serial")
 public class ConstantException extends IllegalArgumentException {
 
 	/**

spring-core/src/main/java/org/springframework/core/NestedIOException.java

@@ -35,6 +35,7 @@ import java.io.IOException;
  * @see org.springframework.core.NestedCheckedException
  * @see org.springframework.core.NestedRuntimeException
  */
+@SuppressWarnings("serial")
 public class NestedIOException extends IOException {
 
 	static {

spring-core/src/main/java/org/springframework/core/enums/AbstractCachingLabeledEnumResolver.java

@@ -99,6 +99,7 @@ public abstract class AbstractCachingLabeledEnumResolver implements LabeledEnumR
 	/**
 	 * Inner cache class that implements lazy building of LabeledEnum Maps.
 	 */
+	@SuppressWarnings("serial")
 	private class LabeledEnumCache extends CachingMapDecorator<Class, Map<Comparable, LabeledEnum>> {
 
 		public LabeledEnumCache() {

spring-core/src/main/java/org/springframework/core/enums/AbstractGenericLabeledEnum.java

@@ -23,6 +23,7 @@ package org.springframework.core.enums;
  * @since 1.2.6
  * @deprecated as of Spring 3.0, in favor of Java 5 enums.
  */
+@SuppressWarnings("serial")
 public abstract class AbstractGenericLabeledEnum extends AbstractLabeledEnum {
 
 	/**

spring-core/src/main/java/org/springframework/core/enums/AbstractLabeledEnum.java

@@ -26,6 +26,7 @@ package org.springframework.core.enums;
  * @deprecated as of Spring 3.0, in favor of Java 5 enums.
  */
 @Deprecated
+@SuppressWarnings("serial")
 public abstract class AbstractLabeledEnum implements LabeledEnum {
 
 	/**

spring-core/src/main/java/org/springframework/core/enums/LetterCodedLabeledEnum.java

@@ -30,6 +30,7 @@ import org.springframework.util.Assert;
  * @deprecated as of Spring 3.0, in favor of Java 5 enums.
  */
 @Deprecated
+@SuppressWarnings("serial")
 public class LetterCodedLabeledEnum extends AbstractGenericLabeledEnum {
 
 	/**

spring-core/src/main/java/org/springframework/core/enums/ShortCodedLabeledEnum.java

@@ -30,6 +30,8 @@ package org.springframework.core.enums;
 @Deprecated
 public class ShortCodedLabeledEnum extends AbstractGenericLabeledEnum {
 
+	private static final long serialVersionUID = 1L;
+
 	/**
 	 * The unique code of this enum.
 	 */

spring-core/src/main/java/org/springframework/core/enums/StaticLabeledEnum.java

@@ -44,6 +44,7 @@ package org.springframework.core.enums;
  * @deprecated as of Spring 3.0, in favor of Java 5 enums.
  */
 @Deprecated
+@SuppressWarnings("serial")
 public abstract class StaticLabeledEnum extends AbstractLabeledEnum {
 
 	/**

spring-core/src/main/java/org/springframework/core/enums/StringCodedLabeledEnum.java

@@ -32,6 +32,7 @@ import org.springframework.util.Assert;
  * @deprecated as of Spring 3.0, in favor of Java 5 enums.
  */
 @Deprecated
+@SuppressWarnings("serial")
 public class StringCodedLabeledEnum extends AbstractGenericLabeledEnum {
 
 	/**

spring-core/src/main/java/org/springframework/core/serializer/support/SerializationFailedException.java

@@ -28,6 +28,7 @@ import org.springframework.core.NestedRuntimeException;
  * @author Juergen Hoeller
  * @since 3.0.5
  */
+@SuppressWarnings("serial")
 public class SerializationFailedException extends NestedRuntimeException {
 
 	/**

spring-core/src/main/java/org/springframework/core/task/SimpleAsyncTaskExecutor.java

@@ -44,6 +44,7 @@ import org.springframework.util.CustomizableThreadCreator;
  * @see org.springframework.scheduling.concurrent.ThreadPoolTaskExecutor
  * @see org.springframework.scheduling.commonj.WorkManagerTaskExecutor
  */
+@SuppressWarnings("serial")
 public class SimpleAsyncTaskExecutor extends CustomizableThreadCreator implements AsyncTaskExecutor, Serializable {
 
 	/**

spring-core/src/main/java/org/springframework/core/task/SyncTaskExecutor.java

@@ -36,6 +36,7 @@ import org.springframework.util.Assert;
  * @since 2.0
  * @see SimpleAsyncTaskExecutor
  */
+@SuppressWarnings("serial")
 public class SyncTaskExecutor implements TaskExecutor, Serializable {
 
 	/**

spring-core/src/main/java/org/springframework/core/task/TaskRejectedException.java

@@ -27,6 +27,7 @@ import java.util.concurrent.RejectedExecutionException;
  * @see TaskExecutor#execute(Runnable)
  * @see TaskTimeoutException
  */
+@SuppressWarnings("serial")
 public class TaskRejectedException extends RejectedExecutionException {
 
 	/**

spring-core/src/main/java/org/springframework/core/task/TaskTimeoutException.java

@@ -25,6 +25,7 @@ package org.springframework.core.task;
  * @see AsyncTaskExecutor#execute(Runnable, long)
  * @see TaskRejectedException
  */
+@SuppressWarnings("serial")
 public class TaskTimeoutException extends TaskRejectedException {
 
 	/**

spring-core/src/main/java/org/springframework/core/type/classreading/CachingMetadataReaderFactory.java

@@ -40,6 +40,7 @@ public class CachingMetadataReaderFactory extends SimpleMetadataReaderFactory {
 
 	private volatile int cacheLimit = DEFAULT_CACHE_LIMIT;
 
+	@SuppressWarnings("serial")
 	private final Map<Resource, MetadataReader> metadataReaderCache =
 			new LinkedHashMap<Resource, MetadataReader>(DEFAULT_CACHE_LIMIT, 0.75f, true) {
 				@Override

spring-core/src/main/java/org/springframework/util/AutoPopulatingList.java

@@ -39,6 +39,7 @@ import java.util.ListIterator;
  * @author Juergen Hoeller
  * @since 2.0
  */
+@SuppressWarnings("serial")
 public class AutoPopulatingList<E> implements List<E>, Serializable {
 
 	/**

spring-core/src/main/java/org/springframework/util/CachingMapDecorator.java

@@ -44,6 +44,7 @@ import java.util.WeakHashMap;
  * @deprecated as of Spring 3.2, to be removed along with LabeledEnum support
  */
 @Deprecated
+@SuppressWarnings("serial")
 public abstract class CachingMapDecorator<K, V> implements Map<K, V>, Serializable {
 
 	private static Object NULL_VALUE = new Object();

spring-core/src/main/java/org/springframework/util/CollectionUtils.java

@@ -386,6 +386,7 @@ public abstract class CollectionUtils {
 	/**
 	 * Adapts a Map to the MultiValueMap contract.
 	 */
+	@SuppressWarnings("serial")
 	private static class MultiValueMapAdapter<K, V> implements MultiValueMap<K, V>, Serializable {
 
 		private final Map<K, List<V>> map;

spring-core/src/main/java/org/springframework/util/ConcurrencyThrottleSupport.java

@@ -43,6 +43,7 @@ import org.apache.commons.logging.LogFactory;
  * @see org.springframework.aop.interceptor.ConcurrencyThrottleInterceptor
  * @see java.io.Serializable
  */
+@SuppressWarnings("serial")
 public abstract class ConcurrencyThrottleSupport implements Serializable {
 
 	/**

spring-core/src/main/java/org/springframework/util/CustomizableThreadCreator.java

@@ -29,6 +29,7 @@ import java.io.Serializable;
  * @since 2.0.3
  * @see org.springframework.scheduling.concurrent.CustomizableThreadFactory
  */
+@SuppressWarnings("serial")
 public class CustomizableThreadCreator implements Serializable {
 
 	private String threadNamePrefix;

spring-core/src/main/java/org/springframework/util/LinkedCaseInsensitiveMap.java

@@ -33,6 +33,7 @@ import java.util.Map;
  * @author Juergen Hoeller
  * @since 3.0
  */
+@SuppressWarnings("serial")
 public class LinkedCaseInsensitiveMap<V> extends LinkedHashMap<String, V> {
 
 	private final Map<String, String> caseInsensitiveKeys;

spring-core/src/main/java/org/springframework/util/comparator/BooleanComparator.java

@@ -25,6 +25,7 @@ import java.util.Comparator;
  * @author Keith Donald
  * @since 1.2.2
  */
+@SuppressWarnings("serial")
 public final class BooleanComparator implements Comparator<Boolean>, Serializable {
 
 	/**