NPE thrown when calling SwingUtilities.updateComponentTreeUI.
.I am trying to make a testcase for JFormattedTextField, I am having an array of all the four LAF, and calling runtest after setting each of them and calling SwingUtilities.updateComponentTreeUI(this). And when the programme calls the runtest for GTK LAF then this erros occurs.

Steps to reproduce:
-------------------
1) Compile and Run the attached code.
2) This exception is random in nature.

It is observed on Linux RH , win2k-prof and Solaris.

The stacktrace is :
-------------------
java.lang.NullPointerException
        at javax.swing.plaf.synth.SynthContext.getPainter(SynthContext.java:181)
        at javax.swing.plaf.synth.SynthRootPaneUI.update(SynthRootPaneUI.java:77
)
        at javax.swing.JComponent.paintComponent(JComponent.java:685)
        at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4739)
        at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4688)
        at javax.swing.JComponent.paint(JComponent.java:937)
        at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
        at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:
60)
        at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97
)
        at java.awt.Container.paint(Container.java:1647)
        at javax.swing.JFrame.update(JFrame.java:390)
        at sun.awt.RepaintArea.updateComponent(RepaintArea.java:192)
        at sun.awt.RepaintArea.paint(RepaintArea.java:169)
        at sun.awt.motif.MComponentPeer.handleEvent(MComponentPeer.java:406)
        at java.awt.Component.dispatchEventImpl(Component.java:3975)
        at java.awt.Container.dispatchEventImpl(Container.java:1962)
        at java.awt.Window.dispatchEventImpl(Window.java:1621)
        at java.awt.Component.dispatchEvent(Component.java:3750)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:214)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.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)
java.lang.NullPointerException
        at javax.swing.plaf.synth.SynthLookAndFeel.paintRegion(SynthLookAndFeel.
java:345)
        at javax.swing.plaf.synth.SynthLookAndFeel.update(SynthLookAndFeel.java:
309)
        at javax.swing.plaf.synth.SynthPanelUI.update(SynthPanelUI.java:93)
        at javax.swing.JComponent.paintComponent(JComponent.java:685)
        at javax.swing.JComponent.paint(JComponent.java:947)
        at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4735)
        at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4688)
        at javax.swing.JComponent._paintImmediately(JComponent.java:4631)
        at javax.swing.JComponent.paintImmediately(JComponent.java:4438)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(System
EventQueueUtilities.java:117)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:188)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:459)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:214)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.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)
java.lang.NullPointerException
        at javax.swing.plaf.synth.SynthLookAndFeel.paintRegion(SynthLookAndFeel.
java:345)
        at javax.swing.plaf.synth.SynthLookAndFeel.update(SynthLookAndFeel.java:
309)
        at javax.swing.plaf.synth.SynthTextFieldUI.update(SynthTextFieldUI.java:
143)
        at javax.swing.JComponent.paintComponent(JComponent.java:685)
        at javax.swing.JComponent.paint(JComponent.java:947)
        at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4735)
        at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4688)
        at javax.swing.JComponent._paintImmediately(JComponent.java:4631)
        at javax.swing.JComponent.paintImmediately(JComponent.java:4438)
        at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:410)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(System
EventQueueUtilities.java:117)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:188)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:459)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:214)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.java:163)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
java.lang.NullPointerException
        at javax.swing.plaf.synth.SynthLabelUI.getPreferredSize(SynthLabelUI.jav
a:133)
        at javax.swing.JComponent.getPreferredSize(JComponent.java:1422)
        at java.awt.GridBagLayout.GetLayoutInfo(GridBagLayout.java:895)
        at java.awt.GridBagLayout.getLayoutInfo(GridBagLayout.java:806)
        at java.awt.GridBagLayout.ArrangeGrid(GridBagLayout.java:1386)
        at java.awt.GridBagLayout.arrangeGrid(GridBagLayout.java:1346)
        at java.awt.GridBagLayout.layoutContainer(GridBagLayout.java:706)
        at java.awt.Container.layout(Container.java:1356)
        at java.awt.Container.doLayout(Container.java:1346)
        at java.awt.Container.validateTree(Container.java:1428)
        at java.awt.Container.validateTree(Container.java:1435)
        at java.awt.Container.validateTree(Container.java:1435)
        at java.awt.Container.validate(Container.java:1403)
        at javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.j
ava:353)
        at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(System
EventQueueUtilities.java:116)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:188)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:459)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:214)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThre
ad.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)


I also get this stack trace sometime:
java.lang.NullPointerException
        at javax.swing.plaf.synth.SynthContext.getPainter(SynthContext.java:181)
        at javax.swing.plaf.synth.SynthRootPaneUI.update(SynthRootPaneUI.java:77)
        at javax.swing.JComponent.paintComponent(JComponent.java:685)
        at javax.swing.JComponent.paintWithOffscreenBuffer(JComponent.java:4739)
        at javax.swing.JComponent.paintDoubleBuffered(JComponent.java:4688)
        at javax.swing.JComponent.paint(JComponent.java:937)
        at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:21)
        at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:60)
        at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:97)
        at java.awt.Container.paint(Container.java:1647)
        at javax.swing.JFrame.update(JFrame.java:390)
        at sun.awt.RepaintArea.updateComponent(RepaintArea.java:192)
        at sun.awt.X11.XRepaintArea.updateComponent(XRepaintArea.java:43)
        at sun.awt.RepaintArea.paint(RepaintArea.java:169)
        at sun.awt.X11.XComponentPeer.handleEvent(XComponentPeer.java:648)
        at java.awt.Component.dispatchEventImpl(Component.java:3975)
        at java.awt.Container.dispatchEventImpl(Container.java:1962)
        at java.awt.Window.dispatchEventImpl(Window.java:1621)
        at java.awt.Component.dispatchEvent(Component.java:3750)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:214)
        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)