Skip init/destroy method check for null beans

Issue: SPR-16063

Author: jhoeller

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

@@ -1764,7 +1764,7 @@ protected void invokeInitMethods(String beanName, final Object bean, @Nullable R
 			}
 		}
 
-		if (mbd != null) {
+		if (mbd != null && bean.getClass() != NullBean.class) {
 			String initMethodName = mbd.getInitMethodName();
 			if (StringUtils.hasLength(initMethodName) &&
 					!(isInitializingBean && "afterPropertiesSet".equals(initMethodName)) &&

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

@@ -1662,8 +1662,8 @@ public boolean isBeanNameInUse(String beanName) {
 	 * @see AbstractBeanDefinition#getDestroyMethodName()
 	 * @see org.springframework.beans.factory.config.DestructionAwareBeanPostProcessor
 	 */
-	protected boolean requiresDestruction(@Nullable Object bean, RootBeanDefinition mbd) {
-		return (bean != null &&
+	protected boolean requiresDestruction(Object bean, RootBeanDefinition mbd) {
+		return (bean.getClass() != NullBean.class &&
 				(DisposableBeanAdapter.hasDestroyMethod(bean, mbd) || (hasDestructionAwareBeanPostProcessors() &&
 						DisposableBeanAdapter.hasApplicableProcessors(bean, getBeanPostProcessors()))));
 	}

spring-beans/src/test/resources/org/springframework/beans/factory/xml/factory-methods.xml

@@ -27,7 +27,7 @@
 	</bean>
 
 	<bean id="null" class="org.springframework.beans.factory.xml.FactoryMethods"
-			factory-method="nullInstance"/>
+			factory-method="nullInstance" init-method="getName"/>
 
 	<bean id="nullWithProperty" class="org.springframework.beans.factory.xml.FactoryMethods"
 			factory-method="nullInstance" init-method="getName" scope="prototype">