Bug 32224 [Show In]Back-linking doesn't work for .class files in jars
Build 20030218 1. Enable back-linking in Package Explorer 2. Open Object (in rt.jar) Observe: An editor on Object.class opens (it shows the attached source). However Object.class is not shown in Package Explorer Note that Alt-Shift-s->Package Explorer doesn't work either.
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/packageview/PackageExplorerPart.java
boolean showCUChildren= store.getBoolean(PreferenceConstants.SHOW_CU_CHILDREN);
		boolean reconcile= PreferenceConstants.UPDATE_WHILE_EDITING.equals(store.getString(PreferenceConstants.UPDATE_JAVA_VIEWS));
		return new PackageExplorerContentProvider(showCUChildren, reconcile);
	}
	
	private PackageExplorerLabelProvider createLabelProvider() {
		return new PackageExplorerLabelProvider(AppearanceAwareLabelProvider.DEFAULT_TEXTFLAGS | JavaElementLabels.P_COMPRESSED,
				AppearanceAwareLabelProvider.DEFAULT_IMAGEFLAGS | JavaElementImageProvider.SMALL_ICONS,
				fContentProvider);			
	}
	
	private void fillActionBars() {
		IActionBars actionBars= getViewSite().getActionBars();
		fActionSet.fillActionBars(actionBars);
	}
	
	private Object findInputElement() {
		Object input= getSite().getPage().getInput();
		if (input instanceof IWorkspace) { 
			return JavaCore.create(((IWorkspace)input).getRoot());
		} else if (input instanceof IContainer) {
			IJavaElement element= JavaCore.create((IContainer)input);
			if (element != null && element.exists())
				return element;
			return input;
		}
		
		
		
		return JavaCore.create(JavaPlugin.getWorkspace().getRoot());