consistent use of JDK 1.5's ThreadLocal.remove() over ThreadLocal.set(null), preventing leaks (SPR-7441)

git-svn-id: https://src.springframework.org/svn/spring-framework/trunk@3627 50f2f4bb-b051-0410-bef5-90022cba6387

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

@@ -904,13 +904,13 @@ public abstract class AbstractBeanFactory extends FactoryBeanRegistrySupport imp
 	protected void afterPrototypeCreation(String beanName) {
 		Object curVal = this.prototypesCurrentlyInCreation.get();
 		if (curVal instanceof String) {
-			this.prototypesCurrentlyInCreation.set(null);
+			this.prototypesCurrentlyInCreation.remove();
 		}
 		else if (curVal instanceof Set) {
 			Set<String> beanNameSet = (Set<String>) curVal;
 			beanNameSet.remove(beanName);
 			if (beanNameSet.isEmpty()) {
-				this.prototypesCurrentlyInCreation.set(null);
+				this.prototypesCurrentlyInCreation.remove();
 			}
 		}
 	}

org.springframework.beans/src/main/java/org/springframework/beans/factory/xml/XmlBeanDefinitionReader.java

@@ -344,7 +344,7 @@ public class XmlBeanDefinitionReader extends AbstractBeanDefinitionReader {
 		finally {
 			currentResources.remove(encodedResource);
 			if (currentResources.isEmpty()) {
-				this.resourcesCurrentlyBeingLoaded.set(null);
+				this.resourcesCurrentlyBeingLoaded.remove();
 			}
 		}
 	}