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
SOLVED - JonnyO answer is right.
I am using java 8 on linux, and downloaded from https://java3d.java.net/binary-builds.html (take the linux-amd64 version for an intel 64 bit system).
After unzipping the downloaded file, and then unzipping the contained j3d-jre.zip and adding the jar files to project and the libj3dcore-ogl.so to the jar, it still did not work. I had to add the libj3dcore-ogl.so to the library path. (Lazy as I am, I just copied it to /usr/lib, what is sufficient.)
Now it is working.
PS: Make sure to remove any other j3dcore.jar and j3dutils.jar beforehand.