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
*/
	MarkerFilter[] getAllFilters() {
		MarkerFilter[] userFilters = super.getAllFilters();
		Collection declaredFilters = MarkerSupportRegistry.getInstance()
				.getRegisteredFilters();
		Iterator iterator = declaredFilters.iterator();
		MarkerFilter[] allFilters = new MarkerFilter[userFilters.length
				+ declaredFilters.size()];
		System.arraycopy(userFilters, 0, allFilters, 0, userFilters.length);
		int index = userFilters.length;
		while (iterator.hasNext()) {
			allFilters[index] = (MarkerFilter) iterator.next();
			index++;
		}
		return allFilters;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.views.markers.internal.MarkerView#addDropDownContributions(org.eclipse.jface.action.IMenuManager)
	 */
	void addDropDownContributions(IMenuManager menu) {
		MenuManager groupByMenu = new MenuManager(
				MarkerMessages.ProblemView_GroupByMenu);
		groupByMenu.add(new GroupingAction(MarkerMessages.ProblemView_Type,
				new FieldCategory(), this));
		Iterator definedGroups = MarkerSupportRegistry.getInstance()
				.getMarkerGroups().iterator();
		while (definedGroups.hasNext()) {
			FieldMarkerGroup group = (FieldMarkerGroup) definedGroups.next();