OPERATING SYSTEM(S):
--------------------
Red Hat Enterprise Linux Server release 5

FULL JDK VERSION(S):
-------------------
java version "1.6.0_02"
Java(TM) SE Runtime Environment (build 1.6.0_02-b05)
Java HotSpot(TM) 64-Bit Server VM (build 1.6.0_02-b05, mixed mode)

DESCRIPTION:
------------
Abstract: Throws AWTException if add system tray on SLES9 Gnome Desktop.

How to reproduce the problem:
1. Login SLES9 wiht Gnome Desktop
2. Run test case: "java SystemTrayTest".
   <--PROBLEM: Print out exception:
         image sun.awt.image.ToolkitImage@6b4da8f4
TrayIcon could not be added.
java.awt.AWTException: TrayIcon couldn't be displayed.
        at sun.awt.X11.XSystemTrayPeer.addTrayIcon(XSystemTrayPeer.java:54)
        at sun.awt.X11.XTrayIconPeer.<init>(XTrayIconPeer.java:179)
        at sun.awt.X11.XToolkit.createTrayIcon(XToolkit.java:849)
        at java.awt.TrayIcon.addNotify(TrayIcon.java:662)
        at java.awt.SystemTray.add(SystemTray.java:240)
        at SystemTrayTest.<init>(SystemTrayTest.java:69)
        at SystemTrayTest.main(SystemTrayTest.java:85)


TestCase:

import java.awt.*;
import java.awt.event.*;

public class SystemTrayTest
{
    
    public SystemTrayTest()
    {
        
        final TrayIcon trayIcon;

        if (SystemTray.isSupported()) {

            SystemTray tray = SystemTray.getSystemTray();
            Image image = Toolkit.getDefaultToolkit().getImage("tray.gif");

            MouseListener mouseListener = new MouseListener() {
                
                public void mouseClicked(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse clicked!");
                }
                public void mouseEntered(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse entered!");
                }
                public void mouseExited(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse exited!");
                }
                public void mousePressed(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse pressed!");
                }
                public void mouseReleased(MouseEvent e) {
                    System.out.println("Tray Icon - Mouse released!");
                }

            };

            ActionListener exitListener = new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    System.out.println("Exiting...");
                    System.exit(0);
                }
            };
            
            PopupMenu popup = new PopupMenu();
            MenuItem defaultItem = new MenuItem("Exit");
            defaultItem.addActionListener(exitListener);
            popup.add(defaultItem);

            trayIcon = new TrayIcon(image, "Tray Demo", popup);

            ActionListener actionListener = new ActionListener() {
                public void actionPerformed(ActionEvent e) {
                    trayIcon.displayMessage("Action Event",
                        "An Action Event Has Been Peformed!",
                        TrayIcon.MessageType.INFO);
                }
            };
            
            trayIcon.setImageAutoSize(true);
            trayIcon.addActionListener(actionListener);
            trayIcon.addMouseListener(mouseListener);

            // Depending on which Mustang build you have, you may need to uncomment
            // out the following code to check for an AWTException when you add
            // an image to the system tray.

            // try {
                      tray.add(trayIcon);
            // } catch (AWTException e) {
            // System.err.println("TrayIcon could not be added.");
            // }

        } else {
            System.err.println("System tray is currently not supported.");
        }
    }
    
    /**
     * @param args the command line arguments
     */
    public static void main(String[] args)
    {
        SystemTrayTest main = new SystemTrayTest();
    }
    
}