NullPointerException Problem...

Hi Guys,

lets get straight to the point. I have this problem:

Exception in thread "Thread-2" java.lang.NullPointerException
   at javax.swing.JComponent.getComponentGraphics(Unknown Source)
   at javax.swing.JComponent.paint(Unknown Source)
   at Display.Display.run(Display.java:39)
   at java.lang.Thread.run(Unknown Source)

So.. here is my code for one class:

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package Display;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;

import javax.swing.JPanel;

public class Display extends JPanel implements Runnable {

   private Graphics g;
   private Thread gameThread;
   private boolean running = false;

   public Display() {
      gameThread = new Thread();
   }

   public void init() {
      running = true;
      gameThread = new Thread(this);
      gameThread.start();

   }

   public void update() {

   }

   public void draw(Graphics g){
      
   }

   @Override
   public void run() {
      while (running) {
         update();
         paint(g);
      }
   }

}

and the other class:

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package fullscreen;

import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;

import javax.swing.JFrame;

import Display.Display;

public class MainFrame extends JFrame {

   private static final long serialVersionUID = -485903859773002276L;
   private GraphicsDevice device;
   private boolean isFullScreen = false;
   private Display display = new Display();

   public MainFrame(GraphicsDevice device) {
      setTitle("SeemRang Fullscreen API");
      setDefaultCloseOperation(EXIT_ON_CLOSE);

      this.device = device;

      add(display);
      display.init();
   }

   public void begin() {
      isFullScreen = device.isFullScreenSupported();
      setUndecorated(isFullScreen);
      setResizable(!isFullScreen);

      if (isFullScreen) {
         // Full-screen mode
         device.setFullScreenWindow(this);
      } else {
         // Windowed mode
         pack();
         setVisible(true);
      }
   }

   public static void main(String[] args) {
      GraphicsEnvironment env = GraphicsEnvironment
            .getLocalGraphicsEnvironment();
      GraphicsDevice[] devices = env.getScreenDevices();

      for (int i = 0; i < 1; i++) {
         MainFrame test = new MainFrame(devices[i]);
         test.begin();
      }
   }
}

and the last.

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package fullscreen;

import java.awt.DisplayMode;

public class FullscreenInit {
   private DisplayMode modes;

   public FullscreenInit(DisplayMode modes) {
      this.modes = modes;
   }

   public DisplayMode getDisplayMode() {
      return modes;
   }

}

any solutions??? Any help will be appreciated.

Thnx,

LucaSeem Grin

package Display;

import java.awt.Canvas;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferStrategy;

import javax.swing.JPanel;

public class Display extends JPanel implements Runnable {

private Thread gameThread;
private boolean running = false;

public Display() {
}

public void init() {
running = true;
gameThread = new Thread(this);
gameThread.start();
}

public void update() {
// Do Game Logic before you Render o,O
draw();
}

public void paint(Graphics g) {
super.paint(g);
}

public void draw() {
repaint();
}

@Override
public void run() {
while (running) {
update();
}
}

}