FULL PRODUCT VERSION :
java version "1.6.0_02-b05" (amd64)
java version "1.6.0_02-b05" (i686)


ADDITIONAL OS VERSION INFORMATION :
Linux 2.6.20-16-generic #2 SMP Thu Jun 7 19:00:28 UTC 2007 x86_64 GNU/Linux (Ubuntu Feisty)
Linux 2.6.21-2-686 #1 SMP Wed Jul 11 03:53:02 UTC 2007 i686 GNU/Linux (Debian unstable)


EXTRA RELEVANT SYSTEM CONFIGURATION :
Server X: X.org
Window managers : Gnome & KDE


A DESCRIPTION OF THE PROBLEM :
A call to TrayIcon.displayMessage() just after JOptionPane.showInputDialog() makes the program crashes.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Call JOptionPane.showInputDialog() for whatever you want, and next call TrayIcon.displayMessage() for whatever you want.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Prompt the user with a nice popup telling him "everything is ok" or "wrong input, your computer will burn".

ACTUAL -
Sudden crash : The swing applications is fully stoped immediatly with an error message from X in the terminal (No exception to catch or anything else ; probably because the X server simply disconnected the java app).


ERROR MESSAGES/STACK TRACES THAT OCCUR :
The program '<unknown>' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
  (Details: serial 802 error_code 3 request_code 20 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.SystemTray;
import java.awt.TrayIcon;
import javax.swing.ImageIcon;

import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JButton;

import javax.swing.JOptionPane;

public class Test {

public Test() {
try {
javax.swing.UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
//javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.gtk.GTKLookAndFeel");
} catch(Exception e) {
System.out.println("Exception while loading the theme : "+e.toString());
return;
}

JFrame frame = new JFrame("plop");

frame.getContentPane().setLayout(new java.awt.GridLayout(1, 1));
frame.getContentPane().add(new JLabel("plop", JLabel.CENTER));

frame.setSize(200, 200);
frame.setVisible(true);


SystemTray systray = SystemTray.getSystemTray();
TrayIcon icon = new TrayIcon(new ImageIcon("blueBunny.png").getImage());

try {
systray.add(icon);
} catch(java.awt.AWTException e) {
System.out.println("Hm, not the expected crash : "+e.toString());
return;
}

try { Thread.sleep(3000); } catch(InterruptedException e) { /* \_o< */ }

String toto = JOptionPane.showInputDialog(frame,
"test",
"test",
JOptionPane.QUESTION_MESSAGE);

icon.displayMessage("test", "test", TrayIcon.MessageType.valueOf("ERROR"));

try { Thread.sleep(5000); } catch(InterruptedException e) { /* \_o< */ }

System.exit(0);
}



public static void main(String[] args) {
new Test();
}

}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
- Use the GTK look and feel.
- Put a Thread.sleep() between the JOptionPane.showInputDialog() and the TrayIcon.displayMessage()