This looks like a class path problem.
Could you verify that j3d-core-utils.jar is present in the classpath?
Could you please submit a short test class?
Any help? This is a quite important feature to add to my project, which is gearing toward release soon.
I have reinstalled Java and Java3D, and am sure my classpaths are set as specified in the installation instructions. The error has not changed for my test SceneGraphIO program. All my other programs work fine, just as before.
My classpath includes three .jar files, the only ones that were in my j3d 1.5.2 download:
j3dcore.jar, j3dutils.jar, vecmath.jar
I don't think there is a file named j3d-core-utils.jar that came with my download.
I'm not sure if you want a test class for the SceneGraphIO or just a general one, but for example, the tutorial programs at http://www.java3d.org/tutorial.html work perfectly fine for me.
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