Problem:getAppletContext().showDocument

I try to set my applet go to the specific URL but applet does not go to the new web page
It seems getAppletContext().showDocument did not work

Code :

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package dicegame;
 
 
import java.awt.*;
import java.net.MalformedURLException;
import java.net.URL;
 
import javax.swing.JApplet;
 
 
 
import javax.swing.*;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
 
 
 
 
public class game extends JApplet {
 
	private JLabel appletScoreLabel;
 
   public void init() {
      try {
 
         javax.swing.SwingUtilities.invokeAndWait(new Runnable() {
            public void run() {
               createGUI();
            }
         });
      }
      catch (Exception e) {
         System.err.println("createGUI didn't successfully complete");
      }
   }
 
   private void createGUI() {
	   this.setSize(240, 300);
      final roll gamepanel = new roll();
 
      appletScoreLabel = new JLabel(""+gamepanel.score, SwingConstants.CENTER);
 
      gamepanel.addChangeListener(new ChangeListener() {
          public void stateChanged(ChangeEvent e) {
 
int score = gamepanel.score;
 
 
                         appletScoreLabel.setText(String.valueOf(score));
             gameover(score);
 
          }
          });
 
 
 
 
      JPanel statusPanel = new JPanel();
      statusPanel.add(new JLabel("Score (in the Applet):  "));
      statusPanel.add(appletScoreLabel);
 
      getContentPane().add(gamepanel, BorderLayout.CENTER);
      getContentPane().add(statusPanel, BorderLayout.SOUTH);
 
 
 
 
 
 
   }
   public void gameover(int s){
	   System.out.println(s);
	   if(s<=0)
	      {
	    	  try {
	    		  System.out.println("hello");
				this.getAppletContext().showDocument
				  (new URL(getCodeBase()+"test.php"),"_self");
			} catch (MalformedURLException e1) {
				  System.out.println("error");
				e1.printStackTrace();
			}
	      }
   }

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