Clean up warnings

spring-beans/src/main/java/org/springframework/beans/factory/config/AutowiredPropertyMarker.java

@@ -34,6 +34,7 @@ import org.springframework.lang.Nullable;
  * @see BeanDefinition#getPropertyValues()
  * @see org.springframework.beans.factory.support.BeanDefinitionBuilder#addAutowiredProperty
  */
+@SuppressWarnings("serial")
 public final class AutowiredPropertyMarker implements Serializable {
 
 	/**

spring-beans/src/main/java/org/springframework/beans/factory/groovy/GroovyBeanDefinitionReader.java

@@ -244,6 +244,7 @@ public class GroovyBeanDefinitionReader extends AbstractBeanDefinitionReader imp
 			logger.trace("Loading Groovy bean definitions from " + encodedResource);
 		}
 
+		@SuppressWarnings("serial")
 		Closure beans = new Closure(this) {
 			@Override
 			public Object call(Object... args) {

spring-beans/src/main/java/org/springframework/beans/factory/support/BeanDefinitionOverrideException.java

@@ -30,6 +30,7 @@ import org.springframework.lang.NonNull;
  * @see DefaultListableBeanFactory#setAllowBeanDefinitionOverriding
  * @see DefaultListableBeanFactory#registerBeanDefinition
  */
+@SuppressWarnings("serial")
 public class BeanDefinitionOverrideException extends BeanDefinitionStoreException {
 
 	private final BeanDefinition beanDefinition;

spring-beans/src/test/java/org/springframework/beans/DirectFieldAccessorTests.java

@@ -41,7 +41,6 @@ public class DirectFieldAccessorTests extends AbstractPropertyAccessorTests {
 	public void withShadowedField() {
 		final StringBuilder sb = new StringBuilder();
 
-		@SuppressWarnings("serial")
 		TestBean target = new TestBean() {
 			@SuppressWarnings("unused")
 			StringBuilder name = sb;

spring-beans/src/test/java/org/springframework/tests/sample/beans/Colour.java

@@ -20,7 +20,6 @@ package org.springframework.tests.sample.beans;
  * @author Rob Harrop
  * @author Juergen Hoeller
  */
-@SuppressWarnings("serial")
 public class Colour {
 
 	public static final Colour RED = new Colour("RED");