Не создается поток

/*
/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
 
package hello;
 
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
//import javax.microedition.lcdui.game.GameCanvas;
//import javax.microedition.
public class Midlet extends MIDlet {
    private MIDPCanvas gameCanvas;
    private Thread t;
    private Display d;
    public void startApp() {
        this.gameCanvas = new MIDPCanvas();
        this.t = new Thread(gameCanvas);
        t.start();
        d = Display.getDisplay(this);
        d.setCurrent(gameCanvas);
    }
 
    public void pauseApp() {
    }
 
    public void destroyApp(boolean unconditional) {
    }
}

package demo;
 
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
 
/**
 * Demo MIDlet creates, runs and displays DemoGameCanvas.
 *
 * @author  Karel Herink
 * @version 1.0
 */
public class GameMidlet extends MIDlet {
 
    private DemoGameCanvas gameCanvas;
    private Thread t;
    private Display d;
 
    public void startApp() {
        this.gameCanvas = new DemoGameCanvas();
        this.t = new Thread(gameCanvas);
        t.start();
        d = Display.getDisplay(this);
        d.setCurrent(gameCanvas);
    }
 
    public void pauseApp() {
    }
 
    public void destroyApp(boolean unconditional) {
        this.gameCanvas.stop();
    }
}

package demo;