FULL PRODUCT VERSION :
java version "1.6.0_10"
Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
Java HotSpot(TM) Server VM (build 11.0-b15, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux unixdev 2.6.23.1-49.fc8 #1 SMP Thu Nov 8 22:14:09 EST 2007 x86_64 x86_64 x86_64 GNU/Linux

A DESCRIPTION OF THE PROBLEM :
JComboBox doesn't fire a MOUSE_CLICKED event if the event opens or closes the combo box's dropdown list. This leads, among other things, to an inability to successfully listen for double-click events with the left mouse button on JComboBoxes because the clickCount for all mouse events is never greater than 1 in this case.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Compile and run the sample code provided. Perform a double-click with the left mouse button on the displayed combo box.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
I would expect the following events to be received and printed by the toolkit listener:

1. MOUSE_PRESSED (clickCount: 1)
2. MOUSE_RELEASED (clickCount: 1)
3. MOUSE_CLICKED (clickCount: 1)
4. MOUSE_PRESSED (clickCount: 2)
5. MOUSE_RELEASED (clickCount: 2)
6. MOUSE_CLICKED (clickCount: 2)
ACTUAL -
4 events are received and printed by the toolkit listener:

1. MOUSE_PRESSED (clickCount: 1)
1. MOUSE_RELEASED (clickCount: 1)
1. MOUSE_PRESSED (clickCount: 1)
1. MOUSE_RELEASED (clickCount: 1)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.awt.AWTEvent;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.MouseEvent;

import javax.swing.JComboBox;
import javax.swing.JFrame;

public class JComboBoxClickTest {

    public static void main(String[] args) {

        String [] comboItems = new String [] {"1", "2", "3"};
                
        
        JFrame frame = new JFrame();
        frame.setTitle("JComboBox click test");

        JComboBox combo =
            new JComboBox(comboItems);
        combo.setEditable(false);
        combo.setPreferredSize(
                new Dimension(100, 50));
        frame.getContentPane().add(combo);

        Toolkit.getDefaultToolkit().addAWTEventListener(new AWTEventListener() {

            public void eventDispatched(AWTEvent event) {
                if (event instanceof MouseEvent
                        && ((MouseEvent)event).getClickCount() > 0) {

                    System.out.println(event);
                }
            }
            
        }, AWTEvent.MOUSE_EVENT_MASK);

        frame.pack();
        frame.setVisible(true);
    }

}
---------- END SOURCE ----------