return new Status(IStatus.WARNING, JavaPlugin.getPluginId(), 0, "The selected system sources file doesn't exist", null);
return new Status(IStatus.WARNING, JavaPlugin.getPluginId(), 0, "The selected JRE sources file doesn't exist", null);
	protected IStatus validateSystemLibrarySource() {		if (!fUseCustomLibrary.getSelection())			return null;		File f= new File(fSystemLibrarySource.getText());		if (!f.isFile())			return new Status(IStatus.WARNING, JavaPlugin.getPluginId(), 0, "The selected system sources file doesn't exist", null);		if (determinePackagePrefix(f) == null)			return new Status(IStatus.WARNING, JavaPlugin.getPluginId(), 0, "Could not find Object.java in the selected sources file", null);		return null;	}