queue = RenderQueue.getInstance();
queue = new RenderQueue();
    protected void init() {        queue = RenderQueue.getInstance();        documentListeners = new HashMap();        setBackground(Color.white);        super.setLayout(null);        layoutThread = new Thread(new LayoutLoop(this), "FlyingSaucer-Layout");        renderThread = new Thread(new RenderLoop(this), "FlyingSaucer-Render");        layoutThread.start();        renderThread.start();    }