Using threads (SwingWorker) to update JTree component

Hi,
Im having a problem trying to update a JTree component (adding child nodes to an existing node) using threads. Im using the SwingWorker3 class (http://java.sun.com/docs/books/tutorial/uiswing/misc/threads.html) for threading.
When the user selects a node for expansion, the logic for fetching the children of the selected node is executed under the construct() method of SwingWorker.
Once this data is obtained, the job of adding the children to the selected node is done in the finished() method which runs on the event-dispatch thread as per documentation of SwingWorker3.
The problem Im facing is that even though the data for the children is obtained and the finished() method executes and adds the children to the selected node, they are not visible in the UI.
If anybody knows how this can be resolved, please let me know. Any help/pointers would be greatly appreciated.
Rgds
Sridhar

I added the tree.updateUI() method call in the finished() method. This renders the children (Yipee!).
But now I have a new problem. If I collapse and again expand a node, I get a NPE. (I see all the child nodes but a exception is still thrown) The exception happens after my treeWillExpand() and treeExpanded() method implementations. So no probs in my code.
If you know of a solution, pleeease let me know.
TIA
Sridhar
Exception occurred during event dispatching:
java.lang.NullPointerException
at javax.swing.plaf.basic.BasicTreeUI.updateSize(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(Unknown Source)
at javax.swing.plaf.basic.BasicTreeUI$MouseHandler.mousePressed(Unknown Source)
at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
at java.awt.Component.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

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Message was edited by:
Sergey.Chunayev

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jagruti..
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Message was edited by:
Sascha Dingeldey

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