Drag and Drop of TextField and JTextField throws "NullPointerException"

When the TextField and JTextField is Dragged and Dropped, an "NullPointerException" is thrown. The bug happens on Merlin build 49, it did not happen on build 48. The bug is reproducible on all windows, Solaris and Linux platforms.

How to produce the Bug:
-----------------------
Complie all the attached java files.
Run SampleCode.java file.
Try Drag and Drop of TextField.
If you find the following Exception,the bug is reprodued.

Exception:
Exception : java.lang.NullPointerException
java.lang.NullPointerException
        at sun.awt.datatransfer.DataTransferer$CharsetComparator.compareCharsets
(DataTransferer.java:1635)
        at sun.awt.datatransfer.DataTransferer$DataFlavorComparator.compare(Data
Transferer.java:1867)
        at java.awt.datatransfer.DataFlavor$TextFlavorComparator.compare(DataFla
vor.java:568)
        at java.util.Collections.max(../../../src/share/classes/java/util/Collec
tions.java:649)
        at java.awt.datatransfer.DataFlavor.selectBestTextFlavor(DataFlavor.java
:526)
        at dndTextFieldTarget.drop(dndTextFieldTarget.java:136)
        at java.awt.dnd.DropTarget.drop(DropTarget.java:400)
        at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTarget
ContextPeer.java:584)
        at sun.awt.dnd.SunDropTargetContextPeer.access$800(SunDropTargetContextP
eer.java:58)
        at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEven
t(SunDropTargetContextPeer.java:838)
        at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(Su
nDropTargetContextPeer.java:776)
        at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:32)
        at java.awt.Component.dispatchEventImpl(Component.java:3345)
        at java.awt.Component.dispatchEvent(Component.java:3327)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:14
0)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:126)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:121)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)
java.lang.NullPointerException
        at dndTextFieldTarget.drop(dndTextFieldTarget.java:157)
        at java.awt.dnd.DropTarget.drop(DropTarget.java:400)
        at sun.awt.dnd.SunDropTargetContextPeer.processDropMessage(SunDropTarget
ContextPeer.java:584)
        at sun.awt.dnd.SunDropTargetContextPeer.access$800(SunDropTargetContextP
eer.java:58)
        at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchDropEven
t(SunDropTargetContextPeer.java:838)
        at sun.awt.dnd.SunDropTargetContextPeer$EventDispatcher.dispatchEvent(Su
nDropTargetContextPeer.java:776)
        at sun.awt.dnd.SunDropTargetEvent.dispatch(SunDropTargetEvent.java:32)
        at java.awt.Component.dispatchEventImpl(Component.java:3345)
        at java.awt.Component.dispatchEvent(Component.java:3327)
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:437)
        at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:14
0)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:126)

        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:121)

        at java.awt.EventDispatchThread.run(EventDispatchThread.java:99)

-----------------------------