About classloading error(sun.awt.DrawingSurface)

Hello all,

I have confronted with above error message.
This was result of running "AnchoredPoint" in 
http://www.ssec.wisc.edu/~curtis/examples/.
I suppose that my JDK has no class DrawingSurface.
==========java 
-version=============================================================
java version "1.4.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

==========message=================================================================
java.lang.NoClassDefFoundError: sun/awt/DrawingSurface
 at 
javax.media.j3d.DrawingSurfaceObjectDSI.getDrawingSurfaceObjectInfo(DrawingSurfaceObjectDSI.java:75)
 at javax.media.j3d.Canvas3D.paint(Canvas3D.java:968)
 at sun.awt.RepaintArea.paint(RepaintArea.java:180)
 at sun.awt.windows.WComponentPeer.handleEvent(WComponentPeer.java:260)
 at java.awt.Component.dispatchEventImpl(Component.java:3586)
 at java.awt.Component.dispatchEvent(Component.java:3367)
 at java.awt.EventQueue.dispatchEvent(EventQueue.java:445)
 at 
java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:190)
 at 
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:144)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:138)
 at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:130)
 at java.awt.EventDispatchThread.run(EventDispatchThread.java:98)

Is there any one who knows what's problem ?
thanks in advance.

Kim
===================================================

 Mr. Kim, Seong-Han
 김 성 한, 金 城 漢
 BCDE Team, Weathernews Korea Inc.
 http://www.weather.co.kr
 http://www.wni.com
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