When SwingSet2 demo is launched on sparc and IA platforms with Ferret Accessibility test suite, I got the NullPointerException when JEditorPane HTML Demo is checked.

STEP TO REPRODUCE:
- Launch SwingSet2 demo with Ferret Accessibility test suite.
- On Ferret window, choose Setting -> Track Mouse option.
- Go to JEditorPane HTML Demo in SwingSet2 demo and go to any of the text link to do the text accessible checking.
- The following excption message will be displayed in the console/terminal:
java.lang.NullPointerException
        at javax.swing.text.html.AccessibleHTML$AccessibleHTMLContext.getLocationOnScreen(AccessibleHTML.java:625)
        at Ferret.updateAccessibleAtMouse(Ferret.java:271)
        at Ferret.timerTimeout(Ferret.java:179)
        at Ferret.actionPerformed(Ferret.java:173)
        at javax.swing.Timer.fireActionPerformed(Timer.java:256)
        at javax.swing.Timer$DoPostEvent.run(Timer.java:190)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:167)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:150)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:136)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:131)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

- In the Ferret window, all data under the Interface Accessible Text is 0 and null.

Note: When I verified the problem with sparc8, there's no problem initially; but when I changed other text link, the same problem happened. I tested the case on sparc 7, 8, 9, IA 9. When I verified the same problem with Ladybird 1.3.1 on IA9, there's no such problem. The data under Interface Accessible Text was accurate in Ferret window and no exceptions were thrown.