I found this bug when testing the testcase for 5036570. So you can find the testcase from bug 5036570. When I type some japanese characters in the forst textfield and close the applet, you will see the following exceptions.

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: component
 argument pData
        at sun.java2d.windows.Win32SurfaceData.initOps(Native Method)
        at sun.java2d.windows.Win32SurfaceData.<init>(Win32SurfaceData.java:450)

        at sun.java2d.windows.Win32SurfaceData.createData(Win32SurfaceData.java:
317)
        at sun.awt.Win32GraphicsConfig.createSurfaceData(Win32GraphicsConfig.jav
a:358)
        at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java
:332)
        at sun.awt.windows.WComponentPeer.replaceSurfaceData(WComponentPeer.java
:313)
        at sun.awt.windows.WComponentPeer$2.run(WComponentPeer.java:353)
        at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:589)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchTh
read.java:234)
        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)

This bug can be reproduced only on Mustang build. It can't be reproduced on Tiger. 

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