diff --git a/spring-aop/src/main/java/org/springframework/aop/framework/AdvisedSupport.java b/spring-aop/src/main/java/org/springframework/aop/framework/AdvisedSupport.java
index 872357efcf..3862d46408 100644
--- a/spring-aop/src/main/java/org/springframework/aop/framework/AdvisedSupport.java
+++ b/spring-aop/src/main/java/org/springframework/aop/framework/AdvisedSupport.java
@@ -72,12 +72,14 @@ public class AdvisedSupport extends ProxyConfig implements Advised {
 
 
 	/** Package-protected to allow direct access for efficiency. */
+	@SuppressWarnings("serial")
 	TargetSource targetSource = EMPTY_TARGET_SOURCE;
 
 	/** Whether the Advisors are already filtered for the specific target class. */
 	private boolean preFiltered = false;
 
 	/** The AdvisorChainFactory to use. */
+	@SuppressWarnings("serial")
 	AdvisorChainFactory advisorChainFactory = new DefaultAdvisorChainFactory();
 
 	/** Cache with Method as key and advisor chain List as value. */
@@ -87,12 +89,14 @@ public class AdvisedSupport extends ProxyConfig implements Advised {
 	 * Interfaces to be implemented by the proxy. Held in List to keep the order
 	 * of registration, to create JDK proxy with specified order of interfaces.
 	 */
+	@SuppressWarnings("serial")
 	private List<Class<?>> interfaces = new ArrayList<>();
 
 	/**
 	 * List of Advisors. If an Advice is added, it will be wrapped
 	 * in an Advisor before being added to this List.
 	 */
+	@SuppressWarnings("serial")
 	private List<Advisor> advisors = new ArrayList<>();
 
 
diff --git a/spring-aop/src/main/java/org/springframework/aop/support/ComposablePointcut.java b/spring-aop/src/main/java/org/springframework/aop/support/ComposablePointcut.java
index 9a259b16a2..61b9e9fcbb 100644
--- a/spring-aop/src/main/java/org/springframework/aop/support/ComposablePointcut.java
+++ b/spring-aop/src/main/java/org/springframework/aop/support/ComposablePointcut.java
@@ -46,8 +46,10 @@ public class ComposablePointcut implements Pointcut, Serializable {
 	/** use serialVersionUID from Spring 1.2 for interoperability. */
 	private static final long serialVersionUID = -2743223737633663832L;
 
+	@SuppressWarnings("serial")
 	private ClassFilter classFilter;
 
+	@SuppressWarnings("serial")
 	private MethodMatcher methodMatcher;
 
 
diff --git a/spring-aop/src/main/java/org/springframework/aop/target/AbstractBeanFactoryBasedTargetSource.java b/spring-aop/src/main/java/org/springframework/aop/target/AbstractBeanFactoryBasedTargetSource.java
index 78c6d3abf6..743e4c7bc1 100644
--- a/spring-aop/src/main/java/org/springframework/aop/target/AbstractBeanFactoryBasedTargetSource.java
+++ b/spring-aop/src/main/java/org/springframework/aop/target/AbstractBeanFactoryBasedTargetSource.java
@@ -54,7 +54,7 @@ public abstract class AbstractBeanFactoryBasedTargetSource implements TargetSour
 
 
 	/** Logger available to subclasses. */
-	protected final Log logger = LogFactory.getLog(getClass());
+	protected final transient Log logger = LogFactory.getLog(getClass());
 
 	/** Name of the target bean we will create on each invocation. */
 	private String targetBeanName;
@@ -66,6 +66,7 @@ public abstract class AbstractBeanFactoryBasedTargetSource implements TargetSour
 	 * BeanFactory that owns this TargetSource. We need to hold onto this
 	 * reference so that we can create new prototype instances as necessary.
 	 */
+	@SuppressWarnings("serial")
 	private BeanFactory beanFactory;
 
 
diff --git a/spring-aop/src/main/java/org/springframework/aop/target/HotSwappableTargetSource.java b/spring-aop/src/main/java/org/springframework/aop/target/HotSwappableTargetSource.java
index 5d85f50438..5bfda76d8e 100644
--- a/spring-aop/src/main/java/org/springframework/aop/target/HotSwappableTargetSource.java
+++ b/spring-aop/src/main/java/org/springframework/aop/target/HotSwappableTargetSource.java
@@ -42,6 +42,7 @@ public class HotSwappableTargetSource implements TargetSource, Serializable {
 
 
 	/** The current target object. */
+	@SuppressWarnings("serial")
 	private Object target;
 
 
diff --git a/spring-aop/src/main/java/org/springframework/aop/target/SingletonTargetSource.java b/spring-aop/src/main/java/org/springframework/aop/target/SingletonTargetSource.java
index 216b7c0648..5e1cafc1b6 100644
--- a/spring-aop/src/main/java/org/springframework/aop/target/SingletonTargetSource.java
+++ b/spring-aop/src/main/java/org/springframework/aop/target/SingletonTargetSource.java
@@ -42,6 +42,7 @@ public class SingletonTargetSource implements TargetSource, Serializable {
 
 
 	/** Target cached and invoked using reflection. */
+	@SuppressWarnings("serial")
 	private final Object target;
 
 
diff --git a/spring-aop/src/test/java/org/springframework/aop/target/PrototypeBasedTargetSourceTests.java b/spring-aop/src/test/java/org/springframework/aop/target/PrototypeBasedTargetSourceTests.java
index 24af32140c..d2dcf75ee9 100644
--- a/spring-aop/src/test/java/org/springframework/aop/target/PrototypeBasedTargetSourceTests.java
+++ b/spring-aop/src/test/java/org/springframework/aop/target/PrototypeBasedTargetSourceTests.java
@@ -71,7 +71,7 @@ public class PrototypeBasedTargetSourceTests {
 		 * Nonserializable test field to check that subclass
 		 * state can't prevent serialization from working
 		 */
-		@SuppressWarnings("unused")
+		@SuppressWarnings({"unused", "serial"})
 		private TestBean thisFieldIsNotSerializable = new TestBean();
 
 		@Override
diff --git a/spring-core/src/main/java/org/springframework/util/MimeType.java b/spring-core/src/main/java/org/springframework/util/MimeType.java
index d428886082..30c115a000 100644
--- a/spring-core/src/main/java/org/springframework/util/MimeType.java
+++ b/spring-core/src/main/java/org/springframework/util/MimeType.java
@@ -102,6 +102,7 @@ public class MimeType implements Comparable<MimeType>, Serializable {
 
 	private final String subtype;
 
+	@SuppressWarnings("serial")
 	private final Map<String, String> parameters;
 
 	@Nullable
diff --git a/spring-core/src/main/java/org/springframework/util/UnmodifiableMultiValueMap.java b/spring-core/src/main/java/org/springframework/util/UnmodifiableMultiValueMap.java
index 067a64250a..72822fcf07 100644
--- a/spring-core/src/main/java/org/springframework/util/UnmodifiableMultiValueMap.java
+++ b/spring-core/src/main/java/org/springframework/util/UnmodifiableMultiValueMap.java
@@ -47,7 +47,7 @@ final class UnmodifiableMultiValueMap<K,V> implements MultiValueMap<K,V>, Serial
 
 	private static final long serialVersionUID = -8697084563854098920L;
 
-
+	@SuppressWarnings("serial")
 	private final MultiValueMap<K, V> delegate;
 
 	@Nullable
@@ -266,7 +266,7 @@ final class UnmodifiableMultiValueMap<K,V> implements MultiValueMap<K,V>, Serial
 
 		private static final long serialVersionUID = 2407578793783925203L;
 
-
+		@SuppressWarnings("serial")
 		private final Set<Entry<K, List<V>>> delegate;
 
 
@@ -531,6 +531,7 @@ final class UnmodifiableMultiValueMap<K,V> implements MultiValueMap<K,V>, Serial
 
 		private static final long serialVersionUID = 5518377583904339588L;
 
+		@SuppressWarnings("serial")
 		private final Collection<List<V>> delegate;
 
 
diff --git a/spring-core/src/test/java/org/springframework/core/serializer/SerializationConverterTests.java b/spring-core/src/test/java/org/springframework/core/serializer/SerializationConverterTests.java
index c383732ae0..7b75825d0c 100644
--- a/spring-core/src/test/java/org/springframework/core/serializer/SerializationConverterTests.java
+++ b/spring-core/src/test/java/org/springframework/core/serializer/SerializationConverterTests.java
@@ -71,7 +71,7 @@ class SerializationConverterTests {
 
 		private static final long serialVersionUID = 1L;
 
-		@SuppressWarnings("unused")
+		@SuppressWarnings({"unused", "serial"})
 		private Object object;
 	}
 
diff --git a/spring-jdbc/src/main/java/org/springframework/jdbc/support/rowset/ResultSetWrappingSqlRowSet.java b/spring-jdbc/src/main/java/org/springframework/jdbc/support/rowset/ResultSetWrappingSqlRowSet.java
index c399afa961..eaca52ef4b 100644
--- a/spring-jdbc/src/main/java/org/springframework/jdbc/support/rowset/ResultSetWrappingSqlRowSet.java
+++ b/spring-jdbc/src/main/java/org/springframework/jdbc/support/rowset/ResultSetWrappingSqlRowSet.java
@@ -67,11 +67,13 @@ public class ResultSetWrappingSqlRowSet implements SqlRowSet {
 	/** use serialVersionUID from Spring 1.2 for interoperability. */
 	private static final long serialVersionUID = -4688694393146734764L;
 
-
+	@SuppressWarnings("serial")
 	private final ResultSet resultSet;
 
+	@SuppressWarnings("serial")
 	private final SqlRowSetMetaData rowSetMetaData;
 
+	@SuppressWarnings("serial")
 	private final Map<String, Integer> columnLabelMap;
 
 
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/MessageHeaders.java b/spring-messaging/src/main/java/org/springframework/messaging/MessageHeaders.java
index 8fd2b3f94a..74eb829106 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/MessageHeaders.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/MessageHeaders.java
@@ -115,7 +115,7 @@ public class MessageHeaders implements Map<String, Object>, Serializable {
 	@Nullable
 	private static volatile IdGenerator idGenerator;
 
-
+	@SuppressWarnings("serial")
 	private final Map<String, Object> headers;
 
 
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/simp/stomp/StompHeaders.java b/spring-messaging/src/main/java/org/springframework/messaging/simp/stomp/StompHeaders.java
index ea38f8f85f..e119e08215 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/simp/stomp/StompHeaders.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/simp/stomp/StompHeaders.java
@@ -104,6 +104,7 @@ public class StompHeaders implements MultiValueMap<String, String>, Serializable
 	public static final String RECEIPT_ID = "receipt-id";
 
 
+	@SuppressWarnings("serial")
 	private final Map<String, List<String>> headers;
 
 
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/support/ErrorMessage.java b/spring-messaging/src/main/java/org/springframework/messaging/support/ErrorMessage.java
index d46df67cf9..c4ae07d424 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/support/ErrorMessage.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/support/ErrorMessage.java
@@ -46,6 +46,7 @@ public class ErrorMessage extends GenericMessage<Throwable> {
 	private static final long serialVersionUID = -5470210965279837728L;
 
 	@Nullable
+	@SuppressWarnings("serial")
 	private final Message<?> originalMessage;
 
 
diff --git a/spring-messaging/src/main/java/org/springframework/messaging/support/GenericMessage.java b/spring-messaging/src/main/java/org/springframework/messaging/support/GenericMessage.java
index 62053d5edf..88595b61c4 100644
--- a/spring-messaging/src/main/java/org/springframework/messaging/support/GenericMessage.java
+++ b/spring-messaging/src/main/java/org/springframework/messaging/support/GenericMessage.java
@@ -38,7 +38,7 @@ public class GenericMessage<T> implements Message<T>, Serializable {
 
 	private static final long serialVersionUID = 4268801052358035098L;
 
-
+	@SuppressWarnings("serial")
 	private final T payload;
 
 	private final MessageHeaders headers;
diff --git a/spring-messaging/src/test/java/org/springframework/messaging/protobuf/Msg.java b/spring-messaging/src/test/java/org/springframework/messaging/protobuf/Msg.java
index 41784343ae..75488b17f9 100644
--- a/spring-messaging/src/test/java/org/springframework/messaging/protobuf/Msg.java
+++ b/spring-messaging/src/test/java/org/springframework/messaging/protobuf/Msg.java
@@ -22,6 +22,7 @@ package org.springframework.messaging.protobuf;
 /**
  * Protobuf type {@code Msg}
  */
+@SuppressWarnings("serial")
 public  final class Msg extends
     com.google.protobuf.GeneratedMessage
     implements MsgOrBuilder {
diff --git a/spring-messaging/src/test/java/org/springframework/messaging/protobuf/SecondMsg.java b/spring-messaging/src/test/java/org/springframework/messaging/protobuf/SecondMsg.java
index 5567d4e784..d2630a320d 100644
--- a/spring-messaging/src/test/java/org/springframework/messaging/protobuf/SecondMsg.java
+++ b/spring-messaging/src/test/java/org/springframework/messaging/protobuf/SecondMsg.java
@@ -6,6 +6,7 @@ package org.springframework.messaging.protobuf;
 /**
  * Protobuf type {@code SecondMsg}
  */
+@SuppressWarnings("serial")
 public  final class SecondMsg extends
     com.google.protobuf.GeneratedMessage
     implements SecondMsgOrBuilder {
diff --git a/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/DefaultDatabaseClient.java b/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/DefaultDatabaseClient.java
index 3f6fec3f07..26e476fd71 100644
--- a/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/DefaultDatabaseClient.java
+++ b/spring-r2dbc/src/main/java/org/springframework/r2dbc/core/DefaultDatabaseClient.java
@@ -530,9 +530,9 @@ class DefaultDatabaseClient implements DatabaseClient {
 
 		private static final long serialVersionUID = -8994138383301201380L;
 
-		final Connection connection;
+		final transient Connection connection;
 
-		final Function<Connection, Publisher<Void>> closeFunction;
+		final transient Function<Connection, Publisher<Void>> closeFunction;
 
 		ConnectionCloseHolder(Connection connection,
 				Function<Connection, Publisher<Void>> closeFunction) {
diff --git a/spring-test/src/main/java/org/springframework/test/context/MergedContextConfiguration.java b/spring-test/src/main/java/org/springframework/test/context/MergedContextConfiguration.java
index 57a15e7561..cee892eec8 100644
--- a/spring-test/src/main/java/org/springframework/test/context/MergedContextConfiguration.java
+++ b/spring-test/src/main/java/org/springframework/test/context/MergedContextConfiguration.java
@@ -84,6 +84,7 @@ public class MergedContextConfiguration implements Serializable {
 
 	private final Class<?>[] classes;
 
+	@SuppressWarnings("serial")
 	private final Set<Class<? extends ApplicationContextInitializer<?>>> contextInitializerClasses;
 
 	private final String[] activeProfiles;
@@ -92,11 +93,14 @@ public class MergedContextConfiguration implements Serializable {
 
 	private final String[] propertySourceProperties;
 
+	@SuppressWarnings("serial")
 	private final Set<ContextCustomizer> contextCustomizers;
 
+	@SuppressWarnings("serial")
 	private final ContextLoader contextLoader;
 
 	@Nullable
+	@SuppressWarnings("serial")
 	private final CacheAwareContextLoaderDelegate cacheAwareContextLoaderDelegate;
 
 	@Nullable
diff --git a/spring-test/src/main/java/org/springframework/test/context/support/DefaultTestContext.java b/spring-test/src/main/java/org/springframework/test/context/support/DefaultTestContext.java
index 86ec4441be..c137275176 100644
--- a/spring-test/src/main/java/org/springframework/test/context/support/DefaultTestContext.java
+++ b/spring-test/src/main/java/org/springframework/test/context/support/DefaultTestContext.java
@@ -40,6 +40,7 @@ import org.springframework.util.StringUtils;
  * @author Rob Harrop
  * @since 4.0
  */
+@SuppressWarnings("serial")
 public class DefaultTestContext implements TestContext {
 
 	private static final long serialVersionUID = -5827157174866681233L;
diff --git a/spring-web/src/main/java/org/springframework/http/HttpHeaders.java b/spring-web/src/main/java/org/springframework/http/HttpHeaders.java
index 8f508cf044..92e9cdec4e 100644
--- a/spring-web/src/main/java/org/springframework/http/HttpHeaders.java
+++ b/spring-web/src/main/java/org/springframework/http/HttpHeaders.java
@@ -420,6 +420,7 @@ public class HttpHeaders implements MultiValueMap<String, String>, Serializable
 	};
 
 
+	@SuppressWarnings("serial")
 	final MultiValueMap<String, String> headers;
 
 
diff --git a/spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java b/spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java
index 299ff406f9..2d95a9db16 100644
--- a/spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java
+++ b/spring-web/src/main/java/org/springframework/http/ReadOnlyHttpHeaders.java
@@ -43,6 +43,7 @@ class ReadOnlyHttpHeaders extends HttpHeaders {
 	private MediaType cachedContentType;
 
 	@Nullable
+	@SuppressWarnings("serial")
 	private List<MediaType> cachedAccept;
 
 
diff --git a/spring-web/src/main/java/org/springframework/web/client/RestClientResponseException.java b/spring-web/src/main/java/org/springframework/web/client/RestClientResponseException.java
index f8747f0d7f..d74e4e2279 100644
--- a/spring-web/src/main/java/org/springframework/web/client/RestClientResponseException.java
+++ b/spring-web/src/main/java/org/springframework/web/client/RestClientResponseException.java
@@ -54,6 +54,7 @@ public class RestClientResponseException extends RestClientException {
 	private final String responseCharset;
 
 	@Nullable
+	@SuppressWarnings("serial")
 	private Function<ResolvableType, ?> bodyConvertFunction;
 
 
diff --git a/spring-web/src/main/java/org/springframework/web/client/UnknownContentTypeException.java b/spring-web/src/main/java/org/springframework/web/client/UnknownContentTypeException.java
index ce47aedbd8..99fc367686 100644
--- a/spring-web/src/main/java/org/springframework/web/client/UnknownContentTypeException.java
+++ b/spring-web/src/main/java/org/springframework/web/client/UnknownContentTypeException.java
@@ -36,7 +36,7 @@ public class UnknownContentTypeException extends RestClientException {
 
 	private static final long serialVersionUID = 2759516676367274084L;
 
-
+	@SuppressWarnings("serial")
 	private final Type targetType;
 
 	private final MediaType contentType;
diff --git a/spring-web/src/test/java/org/springframework/protobuf/Msg.java b/spring-web/src/test/java/org/springframework/protobuf/Msg.java
index 878d8392c4..4ea6bdcb61 100644
--- a/spring-web/src/test/java/org/springframework/protobuf/Msg.java
+++ b/spring-web/src/test/java/org/springframework/protobuf/Msg.java
@@ -22,6 +22,7 @@ package org.springframework.protobuf;
 /**
  * Protobuf type {@code Msg}
  */
+@SuppressWarnings("serial")
 public  final class Msg extends
     com.google.protobuf.GeneratedMessage
     implements MsgOrBuilder {
diff --git a/spring-web/src/test/java/org/springframework/protobuf/SecondMsg.java b/spring-web/src/test/java/org/springframework/protobuf/SecondMsg.java
index efd418e346..dedeee4a55 100644
--- a/spring-web/src/test/java/org/springframework/protobuf/SecondMsg.java
+++ b/spring-web/src/test/java/org/springframework/protobuf/SecondMsg.java
@@ -6,6 +6,7 @@ package org.springframework.protobuf;
 /**
  * Protobuf type {@code SecondMsg}
  */
+@SuppressWarnings("serial")
 public  final class SecondMsg extends
     com.google.protobuf.GeneratedMessage
     implements SecondMsgOrBuilder {
diff --git a/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/WebClientResponseException.java b/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/WebClientResponseException.java
index 55a135bba0..f09d6d8edf 100644
--- a/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/WebClientResponseException.java
+++ b/spring-webflux/src/main/java/org/springframework/web/reactive/function/client/WebClientResponseException.java
@@ -52,6 +52,7 @@ public class WebClientResponseException extends WebClientException {
 	private final HttpHeaders headers;
 
 	@Nullable
+	@SuppressWarnings("serial")
 	private final Charset responseCharset;
 
 	@Nullable
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/protobuf/Msg.java b/spring-webflux/src/test/java/org/springframework/web/reactive/protobuf/Msg.java
index e6edc2648d..dd4d32df0b 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/protobuf/Msg.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/protobuf/Msg.java
@@ -22,6 +22,7 @@ package org.springframework.web.reactive.protobuf;
 /**
  * Protobuf type {@code Msg}
  */
+@SuppressWarnings("serial")
 public  final class Msg extends
     com.google.protobuf.GeneratedMessage
     implements MsgOrBuilder {
diff --git a/spring-webflux/src/test/java/org/springframework/web/reactive/protobuf/SecondMsg.java b/spring-webflux/src/test/java/org/springframework/web/reactive/protobuf/SecondMsg.java
index 98b91f4550..480798a0a2 100644
--- a/spring-webflux/src/test/java/org/springframework/web/reactive/protobuf/SecondMsg.java
+++ b/spring-webflux/src/test/java/org/springframework/web/reactive/protobuf/SecondMsg.java
@@ -6,6 +6,7 @@ package org.springframework.web.reactive.protobuf;
 /**
  * Protobuf type {@code SecondMsg}
  */
+@SuppressWarnings("serial")
 public  final class SecondMsg extends
     com.google.protobuf.GeneratedMessage
     implements SecondMsgOrBuilder {
diff --git a/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ServletAnnotationControllerHandlerMethodTests.java b/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ServletAnnotationControllerHandlerMethodTests.java
index 4b546a2a8f..6866eab072 100644
--- a/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ServletAnnotationControllerHandlerMethodTests.java
+++ b/spring-webmvc/src/test/java/org/springframework/web/servlet/mvc/method/annotation/ServletAnnotationControllerHandlerMethodTests.java
@@ -2765,6 +2765,7 @@ public class ServletAnnotationControllerHandlerMethodTests extends AbstractServl
 
 	@Controller
 	@RequestMapping("/myPath.do")
+	@SuppressWarnings("serial")
 	static class MyParameterDispatchingController implements Serializable {
 
 		private static final long serialVersionUID = 1L;