Java3D is working but it doesn't export into a jar properly it seems.?

I tried the HelloJava3Da tutorial, chapter one in the link, and the example program runs fine in Eclipse (ever since I imported the java3d jars into a library) but when I export into a jar I get “A Java exception has occurred” from the Java Virtual Machine Launcher.

http://java.sun.com/developer/onlineTraining/java3d/

I would greatly appreciate any input on how to fix this… or at least on how to figure out what caused it.