Help get rid of nagging JList UI exception

Does anyone have an idea how to get rid of this nagging exception? By the way, my program continues to run just fine even when it's thrown. I suspect it's thrown because the JList UI is updated while the Listener event is fired...
But I just cannot figure out a work-around for this.
So, the culprit code snippet is:
-----------start code-------------------
oldlist.addListSelectionListener(new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
if(e.getValueIsAdjusting()){
Object selectedValue = oldlist.getSelectedValue();
newlistdata.add(selectedValue);
newlist.setListData(newlistdata);
newlist.updateUI();
//How to get rid of this nagging UI exception?
oldlistdata.remove(selectedValue);
oldlist.setListData(oldlistdata); // EXCEPTION THROWN HERE!
oldlist.updateUI();
------------end code------------------
And the stack trace is:
Optimization completed successfully.
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicListUI.updateLayoutState(BasicListUI.java:1312)
at javax.swing.plaf.basic.BasicListUI.maybeUpdateLayoutState(BasicListUI.java:1292)
at javax.swing.plaf.basic.BasicListUI$Handler.valueChanged(BasicListUI.java:2605)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:147)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:194)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:388)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:398)
at javax.swing.DefaultListSelectionModel.removeSelectionIntervalImpl(DefaultListSelectionModel.java:559)
at javax.swing.DefaultListSelectionModel.clearSelection(DefaultListSelectionModel.java:403)
at javax.swing.JList.clearSelection(JList.java:2013)
at javax.swing.JList.setModel(JList.java:1646)
at javax.swing.JList.setListData(JList.java:1687)
at panorama2flashtools.Main$1.valueChanged(Main.java:215)
at javax.swing.JList.fireSelectionValueChanged(JList.java:1765)
at javax.swing.JList$ListSelectionHandler.valueChanged(JList.java:1779)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:167)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:147)
at javax.swing.DefaultListSelectionModel.fireValueChanged(DefaultListSelectionModel.java:194)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:388)
at javax.swing.DefaultListSelectionModel.changeSelection(DefaultListSelectionModel.java:398)
at javax.swing.DefaultListSelectionModel.setSelectionInterval(DefaultListSelectionModel.java:442)
at javax.swing.JList.setSelectionInterval(JList.java:2035)
at javax.swing.plaf.basic.BasicListUI$Handler.adjustSelection(BasicListUI.java:2721)
at javax.swing.plaf.basic.BasicListUI$Handler.mousePressed(BasicListUI.java:2677)
at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:263)
at java.awt.Component.processMouseEvent(Component.java:6035)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3265)
at java.awt.Component.processEvent(Component.java:5803)
at java.awt.Container.processEvent(Container.java:2058)
at java.awt.Component.dispatchEventImpl(Component.java:4410)
at java.awt.Container.dispatchEventImpl(Container.java:2116)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4322)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:3983)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:3916)
at java.awt.Container.dispatchEventImpl(Container.java:2102)
at java.awt.Window.dispatchEventImpl(Window.java:2429)
at java.awt.Component.dispatchEvent(Component.java:4240)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
BUILD SUCCESSFUL (total time: 35 seconds)
Thanks!

jaarik wrote:
I suspect it's thrown because the JList UI is updated while the Listener event is fired...Quite likely. Are you executing that code in the event thread (the Swing thread) or in some other thread? If the latter, or if the answer is "Huh?" then read the Swing threading tutorial.
And by the way, there's a Swing forum (scroll down a bit) which is inhabited by people who know Swing a lot better than I do.

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Help get rid of nagging JList UI exception

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