Bug 208791 [Markers] NPE in ExtendedMarkersView
org.eclipse.swt.SWTException: Failed to execute runnable (java.lang.NullPointerException) at org.eclipse.swt.SWT.error(SWT.java:3706) at org.eclipse.swt.SWT.error(SWT.java:3624) [... snip ...] Caused by: java.lang.NullPointerException at org.eclipse.ui.internal.provisional.views.markers.ExtendedMarkersView$10.runInUIThread(ExtendedMarkersView.java:896) at org.eclipse.ui.progress.UIJob$1.run(UIJob.java:94) at org.eclipse.swt.widgets.RunnableLock.run(RunnableLock.java:35) at org.eclipse.swt.widgets.Synchronizer.runAsyncMessages(Synchronizer.java:130) ... 52 more This brought down testResourceMappings(), but you just need to check getCategories() can return null. PW
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/internal/provisional/views/markers/ExtendedMarkersView.java
StatusManager.getManager().handle(
							StatusUtil.newStatus(IStatus.ERROR, e.getMessage(),
									e), StatusManager.SHOW);
				else
					StatusManager.getManager().handle(status,
							StatusManager.SHOW);
			}
		}
	}
	private CachedMarkerBuilder builder;
	Collection categoriesToExpand = new HashSet();
	private Clipboard clipboard;
	Collection preservedSelection = new ArrayList();
	private Job updateJob;
	private TreeViewer viewer;
	private IPropertyChangeListener preferenceListener;
	private IMemento memento;
	/**
	 * Return a new instance of the receiver.
	 */
	public ExtendedMarkersView() {
		super();
		instanceCount++;
		preferenceListener = new IPropertyChangeListener() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.jface.util.IPropertyChangeListener#propertyChange(org.eclipse.jface.util.PropertyChangeEvent)
			 */
			public void propertyChange(PropertyChangeEvent event) {