Name: jl125535			Date: 07/19/2004


FULL PRODUCT VERSION :
java version "1.5.0-beta3"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta3-b57)
Java HotSpot(TM) Client VM (build 1.5.0-beta3-b57, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]

EXTRA RELEVANT SYSTEM CONFIGURATION :
This bug only occurs when using the windows XP look and feel.

A DESCRIPTION OF THE PROBLEM :
With java 1.5.0 when a tab in a JTabbedPane is closed, _while the mouse is over that tab_, a NullPointerException is thrown. This is a regression from java 1.4.2.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run the program, below,  on windows with the windows XP look and feel (not windows classic).


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No exception should be thrown.
ACTUAL -
An exception is thrown, see below.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
The full traceback is:

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException:
 1
        at javax.swing.plaf.basic.BasicTabbedPaneUI.getTabBounds(BasicTabbedPaneUI.java:1313)
        at javax.swing.plaf.basic.BasicTabbedPaneUI.getTabBounds(BasicTabbedPaneUI.java:1248)
        at com.sun.java.swing.plaf.windows.WindowsTabbedPaneUI.setRolloverTab(WindowsTabbedPaneUI.java:82)
        at javax.swing.plaf.basic.BasicTabbedPaneUI$TabbedPaneLayout.layoutContainer(BasicTabbedPaneUI.java:2149)
        at java.awt.Container.layout(Container.java:1401)
        at java.awt.Container.doLayout(Container.java:1390)
        at java.awt.Container.validateTree(Container.java:1473)
        at java.awt.Container.validateTree(Container.java:1480)
        at java.awt.Container.validateTree(Container.java:1480)
        at java.awt.Container.validate(Container.java:1448)
        at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:379)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:113)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)



REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

import java.awt.*;
import javax.swing.*;

public class BugReport
{  
   public static void main(String[] args) throws Exception
   {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());

      final JTabbedPane tabs = new JTabbedPane();
      tabs.addTab("Tab 1",new JPanel());
      tabs.addTab("Tab 2",new JPanel());
      JFrame frame = new JFrame("Bug Report");
      frame.setContentPane(tabs);
      frame.setDefaultCloseOperation(frame.EXIT_ON_CLOSE);
      frame.pack();
      frame.show();
      
      Thread.sleep(2000);
      
      Rectangle d = tabs.getBoundsAt(1);
      Point p = new Point(d.x+d.width/2,d.y+d.height/2);
      SwingUtilities.convertPointToScreen(p,tabs);
      Robot robot = new Robot();
      robot.mouseMove(p.x,p.y);
      
      Thread.sleep(2000);
      
      Runnable run = new Runnable()
      {
         public void run()
         {
            tabs.removeTabAt(1);
            tabs.revalidate();
            tabs.repaint();
         }
      };
      SwingUtilities.invokeAndWait(run);
   }
}

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

Release Regression From : 1.4.2
The above release value was the last known release where this 
bug was known to work. Since then there has been a regression.

(Incident Review ID: 286223) 
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