reintroduced "removeAllListeners()" method since Spring DM uses it

org.springframework.context/src/main/java/org/springframework/context/event/AbstractApplicationEventMulticaster.java

@@ -68,6 +68,11 @@ public abstract class AbstractApplicationEventMulticaster
 		this.defaultRetriever.applicationListenerBeans.add(listenerBeanName);
 	}
 
+	public void removeAllListeners() {
+		this.defaultRetriever.applicationListeners.clear();
+		this.defaultRetriever.applicationListenerBeans.clear();
+	}
+
 	public final void setBeanFactory(BeanFactory beanFactory) {
 		this.beanFactory = beanFactory;
 	}

org.springframework.context/src/main/java/org/springframework/context/event/ApplicationEventMulticaster.java

@@ -43,6 +43,13 @@ public interface ApplicationEventMulticaster {
 	 */
 	void addApplicationListenerBean(String listenerBeanName);
 
+	/**
+	 * Remove all listeners registered with this multicaster.
+	 * <p>After a remove call, the multicaster will perform no action
+	 * on event notification until new listeners are being registered.
+	 */
+	void removeAllListeners();
+
 	/**
 	 * Multicast the given application event to appropriate listeners.
 	 * @param event the event to multicast