FULL PRODUCT VERSION :
java version "1.5.0_02"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_02-b09)
Java HotSpot(TM) Client VM (build 1.5.0_02-b09, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows XP [Version 5.1.2600]
(SP2)


A DESCRIPTION OF THE PROBLEM :
The Windows LAF has a problem with empty JMenuBars, in that pressing Alt+Tab to move away from the application throws an unhandled exception.


STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile and launch the attached test.
2. Press Alt+Tab; observe how an ArrayIndexOutOfBoundsException is thrown ("No such child: 0").


EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No exception should be thrown.
ACTUAL -
ArrayIndexOutOfBoundsException ("No such child: 0").

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.ArrayIndexOutOfBoundsException: No such child: 0
at java.awt.Container.getComponent(Container.java:237)
at javax.swing.JMenuBar.getComponentAtIndex(JMenuBar.java:233)
at javax.swing.JMenuBar.getMenu(JMenuBar.java:188)
at com.sun.java.swing.plaf.windows.WindowsRootPaneUI$AltProcessor.altPressed(WindowsRootPaneUI.java:113)
at com.sun.java.swing.plaf.windows.WindowsRootPaneUI$AltProcessor.postProcessKeyEvent(WindowsRootPaneUI.java:164)
at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:637)
at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:831)
at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:741)
at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:592)
at java.awt.Component.dispatchEventImpl(Component.java:3506)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Window.dispatchEventImpl(Window.java:1606)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:456)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:201)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:151)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:145)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:137)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:100)


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import javax.swing.JFrame;
import javax.swing.JMenuBar;
import javax.swing.UIManager;
import javax.swing.WindowConstants;

public class EmptyJMenuBar
{
   public static void main( String[] args )
   {
      try
      {
         UIManager.setLookAndFeel( UIManager.getSystemLookAndFeelClassName() );
      }
      catch ( Exception e )
      {
         e.printStackTrace();
      }
      
      JFrame f = new JFrame();
      f.setSize( 400, 300 );
      f.setLocationRelativeTo( null );
      f.setJMenuBar( new JMenuBar() );
      f.setDefaultCloseOperation( WindowConstants.EXIT_ON_CLOSE );
      f.setVisible( true );
      // once the frame is showing on your desktop, try to Alt+Tab away from it
   }
}

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

CUSTOMER SUBMITTED WORKAROUND :
add a dummy menu(item), and setVisible( false ) on that item.
###@###.### 2005-04-15 20:42:38 GMT