Name: rmT116609			Date: 01/06/2003


FULL PRODUCT VERSION :
java version "1.4.1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.1-b21)
Java HotSpot(TM) Client VM (build 1.4.1-b21, mixed mode)

FULL OPERATING SYSTEM VERSION : Microsoft Windows 2000 [Version 5.00.2195]


A DESCRIPTION OF THE PROBLEM :
Add a JComboBox into a popup menu and attach the popup menu to a frame. Click the frame so that the popup menu show up with the combobox. At this time, if you click the combobox, exceptions occur.

I found this bug in the latest Java 1.4.1_01 JRE also. But 1.3.1 seems OK.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.NullPointerException
        at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.grabContainer
(BasicPopupMenuUI.java:344)
        at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.requestAddGrab
(BasicPopupMenuUI.java:227)
        at javax.swing.plaf.basic.BasicPopupMenuUI$MouseGrabber.stateChanged
(BasicPopupMenuUI.java:273)
        at javax.swing.MenuSelectionManager.fireStateChanged
(MenuSelectionManager.java:158)
        at javax.swing.MenuSelectionManager.setSelectedPath
(MenuSelectionManager.java:86)
        at javax.swing.JPopupMenu.setVisible(JPopupMenu.java:741)
        at javax.swing.JPopupMenu.show(JPopupMenu.java:912)
        at javax.swing.plaf.basic.BasicComboPopup.show(BasicComboPopup.java:177)
        at javax.swing.plaf.basic.BasicComboPopup.togglePopup
(BasicComboPopup.java:982)
        at
javax.swing.plaf.basic.BasicComboPopup$InvocationMouseHandler.mousePressed
(BasicComboPopup.java:632)
        at java.awt.AWTEventMulticaster.mousePressed
(AWTEventMulticaster.java:218)
        at java.awt.Component.processMouseEvent(Component.java:5090)
        at java.awt.Component.processEvent(Component.java:4890)
        at java.awt.Container.processEvent(Container.java:1566)
        at java.awt.Component.dispatchEventImpl(Component.java:3598)
        at java.awt.Container.dispatchEventImpl(Container.java:1623)
        at java.awt.Component.dispatchEvent(Component.java:3439)
        at java.awt.LightweightDispatcher.retargetMouseEvent
(Container.java:3450)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3162)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3095)
        at java.awt.Container.dispatchEventImpl(Container.java:1609)
        at java.awt.Window.dispatchEventImpl(Window.java:1585)
        at java.awt.Component.dispatchEvent(Component.java:3439)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:450)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy
(EventDispatchThread.java:197)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy
(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:144)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class Test
{
	public static void main(String[] args)
	{
		JFrame frame = new JFrame();

		frame.setSize(400, 400);
		frame.setVisible(true);

		String[] list = {"1", "2", "3", "4",};
		JComboBox comb = new JComboBox(list);
		final JPopupMenu pop = new JPopupMenu();
		pop.add(comb);

		frame.addMouseListener (new MouseAdapter() {
			public void mousePressed(MouseEvent e)
			{
				System.out.println("mousePressed");
					pop.show(e.getComponent(), e.getX(), e.getY());
			}

		});
	}
}
---------- END SOURCE ----------

Release Regression From : 1.3.1_06
The above release value was the last known release where this 
bug was known to work. Since then there has been a regression.

(Review ID: 179650) 
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