Hello there, I'm having some trouble implementing DoubleBuffer into my program. Before you faint from the wall of text, you should know that a lot of it is there just in case you need to know. The actual place where I think I'm having problems is in one method.

I've recently looked up a tutorial on the gpwiki about double buffering, and decided to try and implement the code they had into the code I have that I'm trying to implement doublebuffer in. I get the following error: "java.lang.IllegalStateException: Component must have a valid peer".

I don't know if it makes any difference if you know it or not, but the following is the code with the main method. This is just a Frame that displays the ChronosDisplay class inside it. I omitted irrelevant code with "..."

public class CDM extends JFrame
{
    public CDM(String str)
    {
        super("CD:M - "+str);
        try
        {
            ...
            ChronosDisplay theGame = new ChronosDisplay(str);
            ((Component)theGame).setFocusable(true);
            add(theGame);
        }
        catch(Exception e)
        {
            System.out.println("CDM ERROR: " +e);
        }
    }
    public static void main( String args[] )
    {
        CDM run = new CDM("DP_Mini");
    }
}

Here is the code where I think the problem resides (I think the problem is in the paint() method). This class is displayed in the CDM class

public class ChronosDisplay extends Canvas implements  Runnable
{
    String mapName;
    public ChronosDisplay (String str)
    {
        mapName = str;
        new Thread(this).start();
        setVisible(true);
        createBufferStrategy(2);
    }
    public void paint( Graphics window )
 {
        BufferStrategy b = getBufferStrategy();
        Graphics g = null; 
        window.setColor(Color.white);
        try
        {
             g = b.getDrawGraphics();
            paintMap(g);
            paintUnits(g);
            paintBullets(g);
        }
        finally
        { g.dispose(); }
        b.show();
        Toolkit.getDefaultToolkit().sync(); 
    }
    public void paintMap( Graphics window )
    {
        TowerMap m = new TowerMap();
        try
        {
            m = new TowerMap(mapName);
            for(int x=0; x<m.getRows()*50; x+=50)
            {
                for(int y = 0; y<m.getCols()*50; y+=50)
                    {
                        int tileType = m.getLocation(x/50,y/50);
                        Image img;
                        if(tileType == 0)
                        {
                            Tile0 t = new Tile0(x,y);
                            t.draw(window);
                        }
                        ...// More similar if statements for other integers
            }
            catch(Exception e) ...
 }

    ...// Additional methods not shown here

    public void run()
    {
        try
        {
            while(true)
            {
                Thread.currentThread().sleep(20);
                repaint();
            }
        }
        catch(Exception e) ...
    }
}

If you're curious (I doubt it matters), the draw() method in the Tile0 class is:

public void draw( Graphics window )
{
    window.drawImage(img,getX(),getY(),50,50,null);
}

Any pointers, tips, or solutions are greatly appreciated. Thanks for your time! :D