Unexpected Behaviors of Mouse Event in Look And Feel

Question

import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class Test{
     public static void main(String[] args){
          try {
              // Set System L&F
             UIManager.setLookAndFeel(
                 UIManager.getSystemLookAndFeelClassName());
         catch (UnsupportedLookAndFeelException e) {
            // handle exception
         catch (ClassNotFoundException e) {
            // handle exception
         catch (InstantiationException e) {
            // handle exception
         catch (IllegalAccessException e) {
            // handle exception
          JFrame frame = new JFrame();
          frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          frame.setSize(400,400);
          final JPopupMenu popup = new JPopupMenu();
          popup.add(new JMenuItem("Test"));
          JPanel panel = new JPanel();
          panel.addMouseListener(new MouseAdapter(){
               public void mousePressed(MouseEvent e){
                    System.out.println("Mouse Pressed!");
                    if(e.isPopupTrigger())
                         popup.show(e.getComponent(), e.getX(), e.getY());
               public void mouseReleased(MouseEvent e){
                    System.out.println("Mouse Released!");
                    if(e.isPopupTrigger())
                         popup.show(e.getComponent(), e.getX(), e.getY());
          frame.add(panel);
          frame.setVisible(true);
}When I right click, the popup menu shows up and prints:
Mouse Pressed!
Mouse Released!
Then I click on another position, it will print:
Mouse Pressed!
Mouse Released!
The problem is when I set the LookAndFeel to SystemLookAndFeel (which is Windows XP), it only prints:
Mouse Released!
after the pop up menu shows up.
I wonder what happened to the Mouse Pressed Event?

Answer 1

Late to the party, but I'd like to add that I came across this same problem when we recently upgraded from 1.6_02 to 1.6_11. I have a JTable where a right-click produces a JPopupMenu, but a double right-click is a shortcut to one of the popup menu functions. Popup shows up fine on the single-click in both, but the double-click function didn't work in the later version.
As hinted in this thread, it happens when you are reacting to the mousePressed event and you've install the System L&F (at least on Windows XP). I printed out PopupMenu.consumeEventOnClose after setting the L&F, and it reported true. So all I did was override that property to false after setting the L&F, and everything was back to normal.
Not sure why that changed between those two updates. There were bug fixes 6539458 in u4 and 6217905 in u10 that are both related to JPopupMenu, so maybe one of those accounts for the difference. Hopefully I'm not breaking something by overriding the property.