Bug 15301 'show in packages view' - does not work fo java files not in source folders
20020502 open a java file that is in a resource folder (so it is not an ICompilationUnit - just a file with .java extension) 'show in packages view' is present in the context menu but it does nothing
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/viewsupport/BaseJavaElementContentProvider.java
/* (non-Javadoc)
	 *
	 * @see ITreeContentProvider
	 */
	public boolean hasChildren(Object element) {
		if (fProvideMembers) {
			
			if (element instanceof ICompilationUnit ||
				element instanceof IClassFile) {
				return true;
			}
		} else {
			
			if (element instanceof ICompilationUnit ||
				element instanceof IClassFile ||
				element instanceof IFile)
			return false;
		}
			
		if (element instanceof IJavaProject) {
			IJavaProject jp= (IJavaProject)element;
			if (!jp.getProject().isOpen()) {
				return false;
			}	
		}
		
		if (element instanceof IParent) {
			try {
				
				if (((IParent)element).hasChildren())