Bug 178394 NPE in marker adapter buildAll markers
This shows up occasionally in the test suite logs. Probably happening during shutdown !STACK 0 java.lang.NullPointerException at org.eclipse.ui.views.markers.internal.MarkerAdapter.buildAllMarkers(MarkerAdapter.java:262) 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/TableView.java
public void setFocus() {
		Viewer viewer = getViewer();
		if (viewer != null && !viewer.getControl().isDisposed()) {
			viewer.getControl().setFocus();
		}
	}
	/**
	 * Build a comparator from the default settings.
	 * 
	 * @return ViewerComparator
	 */
	protected ViewerComparator buildComparator() {
		return createTableComparator();
	}
	/**
	 * Create a TableComparator for the receiver.
	 * 
	 * @return TableComparator
	 */
	TableComparator createTableComparator() {
		TableComparator sorter = TableComparator
				.createTableSorter(getSortingFields());
		sorter.restoreState(getDialogSettings());
		return sorter;
	}
	
	protected abstract IField[] getSortingFields();
	protected abstract IField[] getAllFields();
	protected abstract IDialogSettings getDialogSettings();
	/**