JApplet problem

I m having a JApplet which has the following needs,
import org.uhm.entities.Person;
import org.uhm.entities.DrawInfo;
import org.uhm.entities.Course;
import org.uhm.utils.*;
and the JApplet runs well on an IDE.. but in a browser, iftstarts and i m not seeing anything.. my HTML code is,
<html>
<applet code =" org.uhmath.gui.StudentGUIApplet.class" width =" 100%" height =" 100%">
</applet>
</html>
am not including Person.class, DrawInfo.class, Course.class.. in my HTML.. is that a problem?? if it is then what shall I do??

Am still working on it and this thing is killing me.
My code generates like 11 .class files:
StudentApplet.class
StudentApplet$1.class
StudentApplet$2.class
StudentApplet$3.class
StudentApplet$4.class
StudentApplet$5.class
StudentApplet$6.class
StudentApplet$7.class
StudentApplet$8.class
StudentApplet$DrawPanel.class
StudentApplet$Receiver.class
It works fine on an IDE (Eclipse) but when I try to run it on a browser, it says the applet has started but i m not seeing anything after that. When i open the java console both in IE and Firefox there is no error message.
This is my HTML source
<html>
<head>
<title>ABCD</title>
</head>
<body>
<applet code = "org.uhmath.gui.StudentApplet.class" width = "100%" height = "100%"
archive = "gui.jar">
</applet>
</body>
</html>gui.jar contains all the above .class files and a few images. My source is StudentApplet.java which contains two inner classes DrawPanel and Receiver. My source is like 900 lines thats why i could not post it here.
I would be extremely pleased if someone can help me with this,
Thanks in advance.

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Weird problem with JApplet

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My ids r
[email protected]
[email protected]
tks...
Jameel

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It had to be something simple, didn't it? (=
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</body>
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To quote from their document--------
Question:
I can't seem to debug Applets with JBuilder3 Standard. If I attempt to debug my Applet
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null

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crosspost http://forum.java.sun.com/thread.jsp?forum=31&thread=492978&tstart=0&trange=30

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Of course. Here is the original code. I have only removed 'imports' from other classes of the project used for localization and image loading.
If you want me to translate for you the Spanish comments to English, please tell me.
This is the code as is now. I have already tried 'requestFocus' and 'grabFocus' even inside a MouseListener attached to 'usuario' (user) and 'clave' (passwd), with no success.
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     marco.setVisible(true);
    * Devuelve el usuario introducido.
   public String getUser() {
     return usuario.getText();
    * Devuelve la contrase�a introducida.
   public String getPasswd() {
     return clave.getText();
    * Limpia el panel de acceso.
   public void limpiar() {
     clave.setText("");
     usuario.setText("");
    * A�ade un listiener a los eventos de
    * petici�n de acceso dado un usuario y
    * una contrase�a.
    * @throws TooManyListenersException si ya se ha a�adido un listener.
   public void addEntrarListener(ActionListener l) throws TooManyListenersException {
     if ((entrarActionListener != null) && (entrarActionListener != l))
       throw new TooManyListenersException("Solo se admite un listener");
     else
       entrarActionListener = l;
    * Borra un listener.
   public void removeEntrarListener(ActionListener l) {
     if (entrarActionListener == l)
       entrarActionListener = null;
     else
       throw new IllegalArgumentException("Intento de borrar un listener no a�adido");
    * Borra todos los listeners.
   public void removeEntrarListeners() {
     entrarActionListener = null;
    * Instancia privada de KeyListener para capturar
    * los 'enter' en los campos de usuario y passwd.
   private KeyListener keyListener = new KeyListener() {
      * Method to handle events for the KeyListener interface.
      * @param e KeyEvent
     public void keyPressed(KeyEvent e) {
       if (e.getKeyCode() != KeyEvent.VK_ENTER)
         return;
       if ((e.getSource() == usuario) )
         clave.requestFocus();
       else {
         requestFocus(); // Se evitan varias pulsaciones seguidas.
         if (entrarActionListener != null)
           entrarActionListener.actionPerformed(new ActionEvent(this, 0, ConstantesXigus.ACCION_ENTRAR));
     /** Method to handle events for the KeyListener interface. */
     public void keyReleased(KeyEvent e) {}
     /** Method to handle events for the KeyListener interface. */
     public void keyTyped(KeyEvent e) {}
    * Ajusta el borde del marco de controles para que aparezcan centrados.
   private void changeEmptyBorder() {
     Dimension dimMarco   = marco.getSize();
     Dimension dimInterno = controles.getPreferredSize();
     int altoBorde = dimMarco.height - dimInterno.height;
     int anchoBorde = (dimMarco.width - dimInterno.width)/2;
     marco.setBorder( new EmptyBorder( (int)(altoBorde * 0.75), anchoBorde, (int)(altoBorde * 0.25), anchoBorde));
}Thank you very much for your help

JApplet initialization problem

I am experiencing a problem with a JApplet that has me perplexed... I wrote the JApplet to act as a front end to a servlet. I am using the Jakarta Tomcat server to execute both the servlet and to serve the web page which contains the applet. The html page containing the applet has been configure to load the latest JRE plugin into a users browser, if need be, and that works OK. When I run the applet from a browser on my own system, I don't have any problems, but when I tried to load the applet over the internet, at a friends house, I get the following walkback... Seems to be complaining about a "no proxy"... Can anyone tell me what this means? The applet does use Swing components, but my understanding is that is OK so long as the latest JRE plugin is installed. My server is up an down a lot, as I develop this application, but you are free to give the applet a try and let me know what you see... The URL is http://www.marcchamberlin.com/control.htm and don't be surprised that it is slow to respond, that is done on purpose so give it a minute... Any help would be much appreciated... ;-)
Opening http://www.marcchamberlin.com/javax/swing/JApplet.class no proxy
load: class DisplayStarChart.class not found.
java.lang.ClassNotFoundException: DisplayStarChart
at sun.applet.AppletClassLoader.loadCode(AppletClassLoader.java:385)
at sun.applet.AppletPanel.createApplet(AppletPanel.java:462)
at sun.applet.AppletPanel.runLoader(AppletPanel.java:395)
at sun.applet.AppletPanel.run(Compiled Code)
at java.lang.Thread.run(Thread.java:474)
P.S. What are Duke Dollars???? Seems to be a lack of documentation about them ;-)

Seems to work OK for me. I got the applet, no problem, and the star-chart was a grey area with the text "star chart goes here". Eventually, the real star-chart appeared (and mighty cool iot looked, too ;-). Here's the output from my Java console:
Servlet URL = http://www.marcchamberlin.com/servlet/StarChartServlet
Servlet URL = http://www.marcchamberlin.com/servlet/StarChartServlet
Attempting to connect to Star Chart Servlet
Attempting to connect to Star Chart Servlet
Connection to servlet has succeeded!
Servlet URL = http://www.marcchamberlin.com/servlet/StarChartServlet?user=userIdent&move=RA%3A+19h30m00.00sDEC%3A+%2B0%B00%270.0%22FOV%3A%2B20%B000%2700%22&date=2001-6-1T10%3A54%3A11
Attempting to connect to Star Chart Servlet
Connection to servlet has succeeded!
Maybe the "no proxy" thing on your friend's system is because he/she is behind some kind of "difficult"' firewall, or the ISP has some strange proxy setup or something?? (I'm using a router as a firewall, and have no proxy set up). Anyway, I get the impression that it's the hardware, not your software, that is the problem. Maybe try it from somewhere else (the local library?!?)

JApplet focussing problem

I have a JApplet in which i have a JTabbedPane. My problem is that in Internet Explorer the focus does not stay on the applet and i have to click on the applet to activate it first and then i can use it. Can anyone tell me how to set the focus on the applet when it loads.

does using requestFocusInWindow have some pre conditions. It did not workNo.
post a sample program that we can compile and run
just the gui stuff, that way we can see how you're adding what to where
Message was edited by:
Michael_Dunn
I said no, but yes, the component has to be displayable/ visible etc
as per the api docs
the timer should overcome that, but if the timer didn't work,
then posting your code would quicken a solution

(Another) problem with custom painting using JApplet and JPanel

Hi all,
I posted regarding this sort of issue yesterday (http://forums.sun.com/message.jspa?messageID=10883107). I fixed the issue I was having, but have run into another issue. I've tried solving this myself to no avail.
Basically I'm working on creating the GUI for my JApplet and it has a few different JPanels which I will be painting to, hence I'm using custom painting. My problem is that the custom painting works fine on the mainGUI() class, but not on the rightGUI() class. My code is below:
import javax.swing.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.image.*;
import java.io.*;
import javax.imageio.*;
public class TetrisClone extends JApplet {
     public void init() {
          setSize( 450, 500 );
          Container content = getContentPane();
          content.add( new mainGUI(), BorderLayout.CENTER );
          content.add( new rightGUI() , BorderLayout.LINE_END );
class mainGUI extends JPanel {
     // Main bit where blocks fall
     public mainGUI() {
          setBackground( new Color(68,75,142) );
          setPreferredSize( new Dimension( 325, 500 ) );
          validate();
     public Dimension getPreferredSize() {
          return new Dimension( 450, 500 );
     public void paintComponent( Graphics g ) {
          super.paintComponent(g);
          // As a test. This shows up fine.
          g.setColor( Color.black );
          g.fillRect(10,10,100,100);
          g.setColor( Color.white );
          g.drawString("Main",45,55);
class rightGUI extends JPanel {
     BufferedImage img = null;
     int currentLevel = 0;
     int currentScore = 0;
     int currentLines = 0;
     public rightGUI() {
          // The right panel. Has quite a few bits. Starts here..
          FlowLayout flow = new FlowLayout();
          flow.setVgap( 20 );
          setLayout( flow );
          setPreferredSize( new Dimension( 125, 500 ) );
          setBackground( new Color(27,34,97) );
          setBorder( BorderFactory.createMatteBorder(0,2,0,0,Color.black) );
          // Next block bit
          JPanel rightNext = new JPanel();
          rightNext.setPreferredSize( new Dimension( 100, 100 ) );
          //rightNext.setBackground( new Color(130,136,189) );
          rightNext.setOpaque( false );
          rightNext.setBorder( BorderFactory.createEtchedBorder(EtchedBorder.LOWERED) );
          Font rightFont = new Font( "Courier", Font.BOLD, 18 );
          // The player's playing details
          JLabel rightLevel = new JLabel("Level: " + currentLevel, JLabel.LEFT );
          rightLevel.setFont( rightFont );
          rightLevel.setForeground( Color.white );
          JLabel rightScore = new JLabel("Score: " + currentScore, JLabel.LEFT );
          rightScore.setFont( rightFont );
          rightScore.setForeground( Color.white );
          JLabel rightLines = new JLabel("Lines: " + currentLines, JLabel.LEFT );
          rightLines.setFont( rightFont );
          rightLines.setForeground( Color.white );
          JPanel margin = new JPanel();
          margin.setPreferredSize( new Dimension( 100, 50 ) );
          margin.setBackground( new Color(27,34,97) );
          JButton rightPause = new JButton("Pause");
          try {
              img = ImageIO.read(new File("MadeBy.gif"));
          catch (IOException e) { }
          add( rightNext );
          add( rightLevel );
          add( rightScore );
          add( rightLines );
          add( margin );
          add( rightPause );
          validate();
     public Dimension getPreferredSize() {
               return new Dimension( 125, 500 );
     public void paintComponent( Graphics g ) {
          super.paintComponent(g);
          g.setColor( Color.black );
          g.drawString( "blah", 425, 475 ); // Doesn't show up
          g.drawImage( img, 400, 400, null ); // Nor this!
          System.out.println( "This bit gets called fine" );
}Any help would be greatly appreciated. I've read loads of swing and custom painting tutorials and code samples but am still running into problems.
Thanks,
Tristan Perry

Many thanks for reminding me about the error catching - I've added a System.out.println() call now. Anywhoo, the catch block never gets run; the image get call works fine.
My problem was/is:
"My problem is that the custom painting works fine on the mainGUI() class, but not on the rightGUI() class. My code is below:"
I guess I should have expanded on that. Basically whatever I try to output in the public void paintComponent( Graphics g ) method of the rightGUI class doesn't get output.
So this doesn't output anything:
g.drawString( "blah", 425, 475 ); // Doesn't show up
g.drawImage( img, 400, 400, null ); // Nor this!
I've checked and experimented with setOpaque(false), however this doesn't seem to be caused by any over-lapping JPanels or anything.
Let me know if I can expand on this :)
Many thanks,
Tristan Perry
Edited by: TristanPerry on Dec 10, 2009 8:40 AM

JApplet problem

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