Problem
-------
Swing components not transmitable through conferencing tools
such as Microsoft's NetMeeting or Sun's Sunforum which conform
to H.323.

I am logging the bug against netmeeting as that is what the client
is running. This is distributed free with Windows 95, 98 and NT
and therefore is widely used.

Windows NetMeeting 3 is a collaborative tool that lets you:
"Text chat" with eight other people*.
 Draw or work with images on a shared whiteboard with eight other people*.
 Share an application (only NetMeeting 3 is required on other clients) with eight other people*.
Send files to up to eight other people at one time.
Do "Internet Telephony" with one other person (free telephone calls anywhere on the Internet).
Do "videoconferencing" with one other person (the long-promised videophone is finally here -- you'll need a video capture card and camera or some way to get video images into your compute.



Code Example
------------
Swing example that does not work

// SimpleApplet.java
//
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.beans.*;

public class SimpleApplet extends JApplet {
public static int INITIAL_HEIGHT =300;
public static int INITIAL_WIDTH =200;

  protected JOptionPane optPane;

  public SimpleApplet() {

    // supress warning message
    getRootPane().putClientProperty("defeatSystemEventQueueCheck",
    Boolean.TRUE);
  }

  public void start() {
    SwingUtilities.invokeLater(new Runnable() {
      public void run() { // run in the event thread . . .

        final int msgType = JOptionPane.QUESTION_MESSAGE;
final int optType = JOptionPane.OK_CANCEL_OPTION;
final String message = "This is a message";
final String title = "Title";

        JPanel p = new JPanel();
        p.setLayout(new GridLayout(1,1));
        p.add(new JLabel("Test Different Dialog Types") );

        final Container content = getContentPane();

        JMenuBar mb = new JMenuBar();
setJMenuBar(mb);
JMenu menu = new JMenu("Dialog");
JMenu imenu = new JMenu("Internal");
mb.add(menu);
mb.add(imenu);
final JMenuItem construct = new JMenuItem("Constructor");
final JMenuItem stat = new JMenuItem("Static Method");
final JMenuItem iconstruct = new JMenuItem("Constructor");
final JMenuItem istat = new JMenuItem("Static Method");
menu.add(construct);
menu.add(stat);
imenu.add(iconstruct);
imenu.add(istat);
optPane = new JOptionPane(message, msgType, optType);
optPane.setWantsInput(true);

construct.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {

// Create and display the dialog
JDialog d = optPane.createDialog(content, message);
d.setVisible(true);

respond(getOptionPaneValue());
}
});

stat.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
String s = JOptionPane.showInputDialog
(content, message, title, msgType);
respond(s);
}
});


iconstruct.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {

// Create and display the dialog
JInternalFrame f = optPane.createInternalFrame(content, title);
f.setVisible(true);

// Listen for the frame to close before getting the value from it.
f.addPropertyChangeListener(new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent ev) {
if ((ev.getPropertyName().equals
(JInternalFrame.IS_CLOSED_PROPERTY))
&& (ev.getNewValue() == Boolean.TRUE)) {
respond(getOptionPaneValue());
}
}
});
}
});

istat.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent ev) {
String s = JOptionPane.showInternalInputDialog
(content, message, title, msgType);
respond(s);
}
});


        
        content.setLayout(new GridBagLayout()); // used to center the panel
        content.add(p);
        validate();
      }
    });
  }

  protected String getOptionPaneValue() {

    // Get the result . . .
    Object o = optPane.getInputValue();
    String s = "<Unknown>";
    if (o != null)
      s = (String)o;

    Object val = optPane.getValue(); // which button?

    // Check for cancel button or closed option
    if (val != null) {
      if (val instanceof Integer) {
        int intVal = ((Integer)val).intValue();
        if((intVal == JOptionPane.CANCEL_OPTION) ||
           (intVal == JOptionPane.CLOSED_OPTION))
          s = "<Cancel>";
      }
    }

    optPane.setInitialValue("X");
    optPane.setInitialValue("");

    return s;
  }

  protected void respond(String s) {
    if (s == null)
      System.out.println("Never mind.");
    else
      System.out.println("You entered: " + s);
  }

  public static void main(String[] args) {
   
    JFrame frame = new JFrame("Test Dialog Application");

   
    Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
    frame.setLocation(screenSize.width/2 - INITIAL_WIDTH/2,
                      screenSize.height/2 - INITIAL_HEIGHT/2);

    SimpleApplet sa = new SimpleApplet();
    sa.start();
   
    JRootPane root = frame.getRootPane();
    Container content = root.getContentPane();
    content.add(sa);

    frame.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {
        System.exit(0);
      }
    });
    frame.setSize(300, 200);
    frame.setVisible(true);
  }
}

Awt example that works
// Test1.java
//
import java.awt.*;
import java.awt.event.*;
import java.applet.* ;


public class Test1 extends Applet
{

  public Test1() {};
  public void paint(Graphics g) {
    g.drawString("Hello World",25,25);
  }


  public static void main(String args[]) {
   System.out.println("Test1 running \n");
   Test1 h = new Test1();
   Frame f = new Frame();
   f.setSize(200,200);
   f.add("Center",h);
   f.setVisible(true);

  }
}


To Reproduce
------------
1. Compile code using jdk 1.2.1

2. Run swing app
   java SimpleApplet

3. Start netmeeting conference and try shareing the java swing app.

4. A large proportion of the text/graphics will be missing at the
   remote end.

5. Run awt app
   java Test1

6. Start netmeeting conference , this will work fine.
   

Circumstance/Expectations
-------------------------


Other Related Information
-------------------------

If the above tests are performed with sun's SunForum,
the Xserver will die at the point the swing app is shared.

I believe the problem to be associated with a lack of heavy-weight
peer components in swing , which is a design feature.