Bug 22164 Referencing JavaPlugin class in earlyStartup causes invalid thread access [misc]
It is possible that this is not a bug, either because it's known & not supported to because it's internal API, but it was rather unexpected, bizzare behavor. I have a plugin which depends on JDT-UI. This plugin also happens to implement IStartup. If at anypoint, I load the org.eclipse.jdt.internal.ui.JavaPlugin class from earlyStartup(), the Plugin loader attempts to load JDT-UI, which then promptly bombs out with invalid thread access and fails to load. This only happens if no JDT UI perspectives are loaded (in other words, on a fresh workspace). I will attach a simple plugin that demonstrates the problem. Just run it on a fresh workspace. The line it fails on seems to be "manager.registerAdapters(new JavaElementAdapterFactory(), IJavaElement.class);" in the startup() method. Thanks, Andrew
org.eclipse.jdt.ui/ui/org/eclipse/jdt/internal/ui/viewsupport/JavaElementImageProvider.java
JavaPlugin.log(e);
			}
			return JavaPluginImages.DESC_OBJS_GHOST;
		}
	}
	
	protected ImageDescriptor getPackageFragmentIcon(IJavaElement element, int renderFlags) throws JavaModelException {
		IPackageFragment fragment= (IPackageFragment)element;
		boolean containsJavaElements= false;
		try {
			containsJavaElements= fragment.hasChildren();
		} catch(JavaModelException e) {
			
		}
		if(!containsJavaElements && (fragment.getNonJavaResources().length > 0))
			return JavaPluginImages.DESC_OBJS_EMPTY_PACKAGE_RESOURCES;
		else if (!containsJavaElements)
			return JavaPluginImages.DESC_OBJS_EMPTY_PACKAGE;
		return JavaPluginImages.DESC_OBJS_PACKAGE;
	}
	
	public void dispose() {
	}	
	
	
	private int computeJavaAdornmentFlags(IJavaElement element, int renderFlags) {
		int flags= 0;
		if (showOverlayIcons(renderFlags) && element instanceof IMember) {
			try {
				IMember member= (IMember) element;