Bug 31683 Show In doesn't work for class file in rt.jar
I20030611 - create Test project that uses Jar container - open NumberFormat.class - activate Show In... and choose Package Explorer Observe: NumberFormat.class doesn't get revealed.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerContentProvider.java
private TreeViewer fViewer;
	private Object fInput;
	private boolean fIsFlatLayout;
	private PackageFragmentProvider fPackageFragmentProvider= new PackageFragmentProvider();
	
	private int fPendingChanges;
	private PackageExplorerPart fPart;
	/**
	 * Creates a new content provider for Java elements.
	 */
	public PackageExplorerContentProvider(PackageExplorerPart part, boolean provideMembers, boolean provideWorkingCopy) {
		super(provideMembers, provideWorkingCopy);	
		fPart= part;
	}
	
	/* (non-Javadoc)
	 * Method declared on IElementChangedListener.
	 */
	public void elementChanged(final ElementChangedEvent event) {
		try {
			processDelta(event.getDelta());
		} catch(JavaModelException e) {
			JavaPlugin.log(e);
		}
	}