Mouse enter and mouse exit messages are ignored

FULL PRODUCT VERSION :
 SE Runtime Environment (build 1.6.0_02-b06)

A DESCRIPTION OF THE PROBLEM :
No mouse enter and mouse exit messages are shown. Only clicks work.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
run the given code and move the mouse over the tray icon.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
"Tray Icon - Mouse entered!" and "Tray Icon - Mouse exited!" should be printed to System.out
ACTUAL -
nothing is printed to System.out

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package test;

import java.awt.AWTException;
import java.awt.Image;
import java.awt.MenuItem;
import java.awt.PopupMenu;
import java.awt.SystemTray;
import java.awt.Toolkit;
import java.awt.TrayIcon;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.JFrame;

public class TestTrayIcon extends JFrame{
private static final long serialVersionUID = 5136100386969955560L;

public TestTrayIcon(){
System.out.println("<DB>TestTrayIcon.java.TestTrayIcon:1");
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 Performed!",
TrayIcon.MessageType.INFO);
}
};

trayIcon.setImageAutoSize(true);
trayIcon.addActionListener(actionListener);
trayIcon.addMouseListener(mouseListener);

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

} else {

// System Tray is not supported
}
}

public static void main(String[] args) {
new TestTrayIcon().setVisible(true);
}
}

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