JDK-6530871 : ClassCastException with JPopupMenu attached to TrayIcon
  • Type: Bug
  • Component: client-libs
  • Sub-Component: javax.swing
  • Affected Version: 6,7
  • Priority: P4
  • Status: Closed
  • Resolution: Duplicate
  • OS: generic,windows_xp
  • CPU: generic,x86
  • Submitted: 2007-03-05
  • Updated: 2011-01-19
  • Resolved: 2007-09-05
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Run the testcase below,
you'll see the messageBox and the green trayicon appear

Click on the green trayIcon ->
ava.lang.ClassCastException: java.awt.TrayIcon cannot be cast to java.awt.Component
	at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.eventDispatched(BasicPopupMenuUI.java:810)
	at java.awt.Toolkit$SelectiveAWTEventListener.eventDispatched(Toolkit.java:2376)

comes up

===Test case===

OS: Windows XP
JDK 6,7 

import javax.swing.*;
import java.awt.*;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;

public class bug {
    public static void main(String[] args) throws Exception {
        SystemTray tray = SystemTray.getSystemTray();
        TrayIcon ti = new TrayIcon(getImage(), "Hello");
        final JPopupMenu popup = new JPopupMenu("Menu");
        popup.add(new JMenuItem("Item"));
        ti.addMouseListener(new MouseAdapter() {
            public void mouseReleased(MouseEvent e) {
                popup.setLocation(e.getX(), e.getY());
        JOptionPane.showMessageDialog(null, "message");

    static Image getImage() {
        BufferedImage im = new BufferedImage(32, 35, BufferedImage.TYPE_INT_ARGB);
        Graphics2D g2 = (Graphics2D) im.getGraphics();
        g2.fillRect(0, 0, im.getWidth(), im.getHeight());
        return im;

SUGGESTED FIX add if (!(ev.getSource() instanceof Component)) { return; } to the BasicPopupMenuUI.MouseGrabber.eventDispatched or rewrite the Swing support for trayIcon see 6285881

EVALUATION The problematic casting happens in the BasicPopupMenu.MouseGrabber.eventDispatched() the mouseEvents comes from the trayIcon instance, so (Component)ev.getSource(); fails with the ClassCastException