JDev throws NPE using Visual Editor

Hi,
I post this here for information.
Whilst trying to track down an intermittant JDev hang I ran the command line exe (jdev.exe) and saw this stack trace when using the Visual Ed to modify a panel layout.
java.lang.NullPointerException
at oracle.jdevimpl.uieditor.assistant.GridBagLayoutAssistant.prepareMouseMoveStatus(GridBagL
ayoutAssistant.java:2507)
at oracle.jdevimpl.uieditor.UIEditorController.mouseMoveNode(UIEditorController.java:767)
at oracle.jdevimpl.uieditor.uicanvas.UICanvas$GlassPane.processMouseMoved(UICanvas.java:2406
at oracle.jdevimpl.uieditor.uicanvas.UICanvas$GlassPane.processMouseMotionEvent(UICanvas.jav
a:1624)
at java.awt.Component.processEvent(Component.java:4901)
at java.awt.Container.processEvent(Container.java:1569)
at java.awt.Component.dispatchEventImpl(Component.java:3615)
at java.awt.Container.dispatchEventImpl(Container.java:1627)
at java.awt.Component.dispatchEvent(Component.java:3477)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:3483)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3211)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3128)
at java.awt.Container.dispatchEventImpl(Container.java:1613)
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)
Regards
Andy

The code on that line is doing this:
<pre>
2501: public String prepareMouseMoveStatus(CmtModelNode node,
2502: CmtModelNode toNode,
2503: Point location)
2504: {
2505: Container container = toNode.getSubcomponent().getAsContainer();
2506: GridBagLayout layout = (GridBagLayout) container.getLayout();
2507: Point cell = layout.location(location.x, location.y);
</pre>
So either layout or location is null. I don't otherwise know enough about this area to say specifically what might be the problem. Can you send me sample code that reproduces the problem?
Thanks,
Brian

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