Bug 114491 [refactoring] CCE in NullRefactoringHistory
3.2 M3 test pass I deleted some projects in (Java and Resource) working sets, but not quite sure what action triggered the exception. !ENTRY org.eclipse.core.resources 4 2 2005-11-01 11:29:35.216 !MESSAGE Problems occurred when invoking code from plug-in: "org.eclipse.core.resources". !STACK 0 java.lang.ClassCastException: org.eclipse.ltk.internal.core.refactoring.history.RefactoringHistoryService$NullRefactoringHistory at org.eclipse.ltk.internal.core.refactoring.history.RefactoringHistoryService$WorkspaceChangeListener.removeDescriptors(RefactoringHistoryService.java:410) at org.eclipse.ltk.internal.core.refactoring.history.RefactoringHistoryService$WorkspaceChangeListener.resourceChanged(RefactoringHistoryService.java:454) at org.eclipse.core.internal.events.NotificationManager$2.run(NotificationManager.java:276) at org.eclipse.core.internal.runtime.InternalPlatform.run(InternalPlatform.java:1044) at org.eclipse.core.runtime.Platform.run(Platform.java:783) at org.eclipse.core.internal.events.NotificationManager.notify(NotificationManager.java:270) at org.eclipse.core.internal.events.NotificationManager.handleEvent(NotificationManager.java:254) at org.eclipse.core.internal.resources.Workspace.broadcastEvent(Workspace.java:201) at org.eclipse.core.internal.resources.Resource.unprotectedDelete(Resource.java:1573) at org.eclipse.core.internal.resources.Resource.delete(Resource.java:670) at org.eclipse.core.internal.resources.Project.delete(Project.java:332) at org.eclipse.ui.actions.DeleteResourceAction.delete(DeleteResourceAction.java:419) at org.eclipse.ui.actions.DeleteResourceAction.delete(DeleteResourceAction.java:395) at org.eclipse.ui.actions.DeleteResourceAction.access$0(DeleteResourceAction.java:385) at org.eclipse.ui.actions.DeleteResourceAction$3.run(DeleteResourceAction.java:502) at org.eclipse.core.internal.resources.Workspace.run(Workspace.java:1705) at org.eclipse.ui.actions.DeleteResourceAction$2.run(DeleteResourceAction.java:500) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:76)
org.eclipse.ltk.core.refactoring/src/org/eclipse/ltk/internal/core/refactoring/history/RefactoringHistoryService.java
/**
		 * Pops the top descriptor off the stack.
		 * 
		 * @throws EmptyStackException
		 *             if the stack is empty
		 */
		void pop() throws EmptyStackException {
			try {
				final boolean pop= RefactoringCorePlugin.getDefault().getPluginPreferences().getBoolean(RefactoringPreferenceConstants.PREFERENCE_ENABLE_WORKSPACE_REFACTORING_HISTORY);
				if (pop) {
					final RefactoringDescriptor descriptor= (RefactoringDescriptor) fImplementation.getFirst();
					if (!descriptor.isUnknown()) {
						final long stamp= descriptor.getTimeStamp();
						if (stamp >= 0)
							fManager.removeDescriptor(stamp);
					}
				}
			} catch (CoreException exception) {
				RefactoringCorePlugin.log(exception);
			}
			if (!fImplementation.isEmpty()) {
				fImplementation.removeFirst();
				return;
			} else
				populateCache(new NullProgressMonitor());
			if (fImplementation.isEmpty())
				throw new EmptyStackException();
			fImplementation.removeFirst();
		}
		/**