Bug 176441 [Markers] NPE while refreshing the problem view
I got this exception using I20070228-0930. No steps to reproduce. It seems to happen when refreshing the problem view. java.lang.NullPointerException at org.eclipse.ui.views.markers.internal.MarkerAdapter.buildAllMarkers(MarkerAdapter.java:251) at org.eclipse.ui.views.markers.internal.MarkerView.updateForContentsRefresh(MarkerView.java:570) at org.eclipse.ui.views.markers.internal.MarkerView$MarkerProcessJob.run(MarkerView.java:151) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:58)
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/ProblemView.java
}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.internal.MarkerView#getTableSorter()
	 */
	public TableComparator getTableSorter() {
		return ((CategoryComparator) getViewer().getComparator()).innerSorter;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.internal.MarkerView#createPartControl(org.eclipse.swt.widgets.Composite)
	 */
	public void createPartControl(Composite parent) {
		super.createPartControl(parent);
		createActivityManagerListener();
		PlatformUI.getWorkbench().getActivitySupport().getActivityManager()
				.addActivityManagerListener(activityManagerListener);
	}
	/**
	 * Create a new listener for activity changes.
	 */
	private void createActivityManagerListener() {
		activityManagerListener = new IActivityManagerListener() {
			/*
			 * (non-Javadoc)
			 * 
			 * @see org.eclipse.ui.activities.IActivityManagerListener#activityManagerChanged(org.eclipse.ui.activities.ActivityManagerEvent)
			 */