Bug 62401 [Actions] ReferenceCleanerThread in ActionContributionItem cause application can not exit normally.
When the standalone application exit, the display disposed, will call ReferenceCleanerThread.stopCleaning() method, it simply set the running field to false, but "reference = referenceQueue.remove();" in line 196 still blocking. And you must call System.exit() explicitlly to terminate the currently running Java Virtual Machine. so I think it is a bug. My env: XP home edition, jdk 1.4.2_04, and eclipse-SDK-I20040514-win32 Regards, Eric
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ActionContributionItem.java
}
						}
					}
				}
			}
			
			
			if (action.isEnabled()) {
				boolean trace = Policy.TRACE_ACTIONS;
				
				long ms = System.currentTimeMillis();
				if (trace)
					System.out.println("Running action: " + action.getText()); 
				action.runWithEvent(e);
				if (trace)
					System.out.println((System.currentTimeMillis() - ms) + " ms to run action: " + action.getText()); 
			}
		}
	}
	/* (non-Javadoc)
	 * Method declared on Object.
	 */
	public int hashCode() {
		return action.hashCode();
	}
	/**
	 * Returns whether the given action has any images.
	 * 
	 * @param actionToCheck the action
	 * @return <code>true</code> if the action has any images, <code>false</code> if not