Cant add() a Canvas into a JPane

Question

Hello all!
i having problem to include canvas within a JPanel.
i subclass the Canvas with an image , i test it and its works :
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.event.*;
import java.util.*;
import java.net.*;
public class testImage extends JFrame{
  public testImage(){
    imageViewer m = new imageViewer();
    m.initImage("http://127.0.0.1/image/samifox.gif");
    getContentPane().add(m);
  public static void main(String[] args) {
    JFrame frame = new testImage();
    frame.addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
          System.exit(0);
      //frame.pack();
      frame.setSize(300,300);
      frame.setVisible(true);
class imageViewer extends Canvas{
  Image image;
  URL url;
  Toolkit tool;
  public void initImage(String path){
    try{
      url = new URL(path);
    }catch(Exception e){
      System.out.println(e.toString());
    image = Toolkit.getDefaultToolkit().getImage(url);
    setImage(image);
  void setImage(Image image){
    this.image = image ;
    repaint() ;
  public void paint(Graphics g){
    super.paint(g) ;
    try{
       g.drawImage(image,0,0,this) ;
       //g.drawString("ssss",25,25,this);
    } catch (NullPointerException e) {
          System.out.println(e.toString());
}but i cant include this canvas subclass into a JPane i tried :
//xxx
import javax.swing.*;
import javax.swing.text.*;
import java.awt.*;              //for layout managers
import java.awt.event.*;        //for action and window events
import com.borland.jbcl.layout.*;
public class testPanel extends JFrame{
  myJPane mypanel;
   public testPanel(){
    mypanel=new myJPane();
    getContentPane().add(mypanel);
  public static void main(String[] args) {
    JFrame frame = new testPanel();
    frame.addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
          System.exit(0);
      //frame.pack();
      frame.setSize(300,300);
      frame.setVisible(true);
class myJPane extends JPanel{
  imageViewer imgViewer;
  public myJPane(){
    imgViewer = new imageViewer();
    imgViewer.initImage("http://127.0.0.1/image/samifox.gif");
    add(imgViewer);
i add and remove from  JPanel lots of component but when i had the use canvas it seem like i dont understand someting that very basic...
any kind of help will be appriciated
Shay

Answer 1

hi Pual!
Are you getting error messages? no , i dont get any compiler or run-time error
Or does the program run and not do what you expect? yes , exectly , you see i extend Canvas and i draw in it an Image. now i have extended JPane , i need to add the extended canvas to JPane, like i said i dont recieve any error but the program doesnt show the canvas on the JPane like i except it.
the Canvas does show in a JFrame but when i try too add the Canvas to JPanel , i faild.
i hope its more understandable now!
thank you
Shay