Bug 137356 [Markers] marker grouping not working as expected via markerSupport
N20060418-0010 The Java tooling now warns when a buildpath references an execution environment for which there is no exact match in the workspace (warning support is in HEAD as of today - org.eclipse.jdt.launching and org.eclipse.jdt.debug.ui plugins). The marker created should be categorized as a buildpath problem with other JDT build path problems. To do this, I create a marker support extension as follows (in jdt.debug.ui). <extension point="org.eclipse.ui.ide.markerSupport"> <markerAttributeGrouping defaultGroupingEntry="org.eclipse.jdt.ui.category.buildpath" markerType="org.eclipse.jdt.launching.jreContainerMarker"/> </extension> My understanding is that this should group all markers of type "org.eclipse.jdt.launching.jreContainerMarker" as buildpath problems. JUI has a corresponding grouping entry: <markerGroupingEntry id="org.eclipse.jdt.ui.category.buildpath" markerGrouping="org.eclipse.jdt.ui.java_marker_category" label="%MarkerCategory.buildpath" priority="100"/> I get the following error in the log: Reference to invalid markerGroupingEntry org.eclipse.jdt.ui.category.buildpath
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerSupportRegistry.java
if (sorter == null) {
			return new TableSorter(new IField[0], new int[0], new int[0]);
		}
		return sorter;
	}
	/**
	 * Return the list of root marker types.
	 * 
	 * @return List of MarkerType.
	 */
	private MarkerType getRootType() {
		if (rootType == null) {
			rootType = (MarkerTypesModel.getInstance())
					.getType(IMarker.PROBLEM);
		}
		return rootType;
	}
	/**
	 * Find the best match sorter for typeName in the children. If it cannot be
	 * found then return <code>null</code>.
	 * 
	 * @param typeName
	 * @param type
	 * @return TableSorter or <code>null</code>.
	 */
	private TableSorter findSorterInChildren(String typeName, MarkerType type) {
		MarkerType[] types = type.getAllSubTypes();
		TableSorter defaultSorter = null;
		if (hierarchyOrders.containsKey(type.getId())) {
			defaultSorter = (TableSorter) hierarchyOrders.get(type.getId());