ive ran into some trouble configuring java3D to work with my IDE environment...
I have downloaded j3d-1_5_2-linux-i586.zip, and unpacked j3dcore.jar, j3dutils.jar, v
I had this exact problem and the solution for me (I use eclipse) was to download the 32-bit (i586) (from https://java3d.java.net/binary-builds.html) archive and use those natives.