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
builder.updateFrom(dialog);
		}
	}
	/**
	 * Open the selected markers
	 */
	void openSelectedMarkers() {
		IMarker[] markers = getSelectedMarkers();
		for (int i = 0; i < markers.length; i++) {
			IMarker marker = markers[i];
			IWorkbenchPage page = getSite().getPage();
			openMarkerInEditor(marker, page);
		}
	}
	/**
	 * Register the context menu for the receiver so that commands may be added
	 * to it.
	 */
	private void registerContextMenu() {
		MenuManager contextMenu = new MenuManager();
		contextMenu.setRemoveAllWhenShown(true);
		getSite().registerContextMenu(contextMenu, viewer);
		
		if (!getSite().getId().equals(MarkerSupportRegistry.MARKERS_ID))
			getSite().registerContextMenu(MarkerSupportRegistry.MARKERS_ID,
					contextMenu, viewer);
		Control control = viewer.getControl();
		Menu menu = contextMenu.createContextMenu(control);
		control.setMenu(menu);
	}