Getting Exceptions while navigating menu through Keybaord e.g. Alt + F

When i operate menu through Mnemonics i am gettig following exceptions

at javax.swing.JList.getNextMatch(JList.java:977)
        at javax.swing.plaf.basic.BasicListUI$KeyHandler.keyTyped(BasicListUI.java:1613)
        at java.awt.AWTEventMulticaster.keyTyped(AWTEventMulticaster.java:180)
        at java.awt.Component.processKeyEvent(Component.java:4821)
        at javax.swing.JComponent.processKeyEvent(JComponent.java:2230)
        at java.awt.Component.processEvent(Component.java:4700)
        at java.awt.Container.processEvent(Container.java:1308)
        at java.awt.Component.dispatchEventImpl(Component.java:3460)
        at java.awt.Container.dispatchEventImpl(Container.java:1370)
        at java.awt.Component.dispatchEvent(Component.java:3327)
        at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1510)
        at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:576)
        at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:693)
        at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:631)
        at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:548)
        at java.awt.Component.dispatchEventImpl(Component.java:3351)
        at java.awt.Container.dispatchEventImpl(Container.java:1370)
        at java.awt.Window.dispatchEventImpl(Window.java:1338)
        at java.awt.Component.dispatchEvent(Component.java:3327)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:439)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:140)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:126)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:121)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)


UPDATING THIS BUG AFTER GETTING MAILS FROM JAWS ENGINEERS
Here is the configuration

> >Hi Andy/Scott,
> >
> >
> >This is to inform again the platform specific and JRE related info
> >
> >JRE 1.4.0-beta-build-54
> >JaWS1.0.1-ea-build-07
> >Solaris Sparc 8 , 64 bit
> >
> >
> >
> >Thanks,
> >Viney
> >


viney.verma@India 2001-03-14