docs: protected static IPackageFragmentRoot[] findRootsForClasspath(IPath entry, IJavaProject[] searchOrder) {
  		for (int i= 0; i < searchOrder.length; i++) {
  			IPackageFragmentRoot[] elements= findRootsInProject(entry, searchOrder[i]);
  			if (elements.length != 0) {
  				return elements;
  			}
  		}
  		return null;
  	}