Name: rmT116609 Date: 11/04/2002


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 :
Windows NT Version 4.0

A DESCRIPTION OF THE PROBLEM :
Clicking on a JComboBox before the end of an event dispatch which will close its containing window will cause an IllegalComponentStateException. I expect there may be similar problems with other Swing components.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile and run source.
2. Click on "Cancel".
3. Click on the filter combo before the dialog closes.

EXPECTED VERSUS ACTUAL BEHAVIOR :
Expect nothing, get a stack dump.


ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
     at java.awt.Component.getLocationOnScreen_NoTreeLock
(Component.java:1507)
     at java.awt.Component.getLocationOnScreen(Component.java:1481)
     at javax.swing.JPopupMenu.show(JPopupMenu.java:906)
     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)^C
     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.*;

    public class JComboBoxBug2 {
       public static void main(String args[]) {
         JFileChooser fc =
                new JFileChooser() {
                   public void cancelSelection() {
                     try {
                        Thread.sleep(2000); }
                         catch(Exception e) {
                        }
                     super.cancelSelection();
                  }
               };
         fc.showOpenDialog(null);
      }
   }

---------- END SOURCE ----------

CUSTOMER WORKAROUND :
You can reduce the frequency of this bug by closing the containing window as soon as possible during event handling.
(Review ID: 166595)
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