Which version are you running? Are you doing an eclipse build or a maven build of your project? Did you build the 0.9 release yourself, checked it out from the repository, or are you using the files that sometimes get mailed out with the purchase of the manual? I used the latter for a while and I had no problems with the regular eclipse build, but the maven build was tricky to figure out. Eventually we got that working by NOT using the jogl or gluegen jars that shipped with jzy3d. You can get those directly from their respective maven repositories and it works just fine. Even then, however, we still had to decompress the platform specific jar that contained the DLL's to a local folder, then add that folder to the windows path so we could execute our JAR outside eclipse. If you're forever within eclipse, that last step is not necessary it seems.