🚀 go-pugleaf

I am using the code below to change the look and feel of my app using 3 
radio buttons for Metal, Motif and Windows.

The L & F changes alright.  But I get a null pointer exception along the 
way.  The stack trace is also shown below but I am unable to make much of 
it.  Any help would be appreciated.

TIA
George

------------------------------------------------------------------------------------------------
MY CODE

    int laf = userPreferences.getInt("LOOK_AND_FEEL", 
LookAndFeelPanel.METAL);
    switch (laf) {
     case LookAndFeelPanel.MOTIF:
       UIManager.setLookAndFeel("com.sun.java.swing.plaf.motif.MotifLookAndFeel");
       SwingUtilities.updateComponentTreeUI(this);
//       this.pack();
       return;
     case LookAndFeelPanel.WINDOWS:
       UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
       SwingUtilities.updateComponentTreeUI(this);
//       this.pack();

       return;
     default:
       UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
      SwingUtilities.updateComponentTreeUI(this);
//      this.pack();

----------------------------------------------------------------------------------------------
STACK TRACE

Exception occurred during event dispatching:

java.lang.NullPointerException

 at 
javax.swing.plaf.basic.BasicSplitPaneUI.getPreferredSize(BasicSplitPaneUI.java:1065)

 at javax.swing.JComponent.getPreferredSize(JComponent.java:1582)

 at java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:911)

 at java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:816)

 at java.awt.GridBagLayout.preferredLayoutSize(GridBagLayout.java:636)

 at java.awt.Container.preferredSize(Container.java:1558)

 at java.awt.Container.getPreferredSize(Container.java:1543)

 at javax.swing.JComponent.getPreferredSize(JComponent.java:1584)

 at java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:911)

 at java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:816)

 at java.awt.GridBagLayout.ArrangeGrid(GridBagLayout.java:1412)

 at java.awt.GridBagLayout.arrangeGrid(GridBagLayout.java:1372)

 at java.awt.GridBagLayout.layoutContainer(GridBagLayout.java:712)

 at java.awt.Container.layout(Container.java:1401)

 at java.awt.Container.doLayout(Container.java:1390)

 at java.awt.Container.validateTree(Container.java:1473)

 at java.awt.Container.validateTree(Container.java:1480)

 at java.awt.Container.validateTree(Container.java:1480)

 at java.awt.Container.validate(Container.java:1448)

 at 
javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:379)

 at 
javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:113)

 at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)

 at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)

 at 
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)

 at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)

 at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:153)

 at java.awt.Dialog$1.run(Dialog.java:515)

 at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)

 at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)

 at 
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:234)

 at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)

 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)

 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)

 at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)