FULL PRODUCT VERSION :


A DESCRIPTION OF THE PROBLEM :
The action on a PopupMenu's MenuItem is not fired if the PopupMenu is shown from a JWindow.

REGRESSION.  Last worked in version 7u40

REGRESSION : Additional Information
I know JDK6 works.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Just run the code in the description, click on the "Click me' Button, a window will show, click the "Button" button again, a popup menu will show up. Clicking on the only MenuItem, nothing happens.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The correct behavior is to see a message box.
ACTUAL -
Nothing happened. The registered action for the MenuItem is not triggered

ERROR MESSAGES/STACK TRACES THAT OCCUR :
/**
 * Copyright (c) 2007 NoMagic, Inc. All Rights Reserved.
 */

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class PopupMouseEventDemo extends JFrame {

    public PopupMouseEventDemo() {
        JButton button = new JButton("Click me");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                createMenu();
            }
        });

        setMinimumSize(new Dimension(300, 300));
        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);

        JPanel panel = new JPanel(new BorderLayout());
        panel.add(button, BorderLayout.NORTH);


        add(panel);
        setVisible(true);
    }

    private void createMenu() {
        final JWindow popup = new JWindow();
        popup.getContentPane().setLayout(new BorderLayout());

        final JButton button = new JButton("Button");
        button.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                JPopupMenu popupMenu = new JPopupMenu();
                JMenuItem menuItem = new JMenuItem(new AbstractAction("MenuItem") {
                    @Override
                    public void actionPerformed(ActionEvent e) {
                        JOptionPane.showMessageDialog(null, "Clicked");

                    }
                });
                popupMenu.add(menuItem);
                popupMenu.show(button, 0, popup.getPreferredSize().height);
            }
        });

        popup.getContentPane().add(button);
        popup.pack();
        popup.setLocationRelativeTo(PopupMouseEventDemo.this);
        popup.setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                new PopupMouseEventDemo();
            }
        });
    }
}


REPRODUCIBILITY :
This bug can be reproduced always.