Thanks for solving this I was beginning to pull my hair out.by stephen george - RepRap Host
For the love of god please please please change the instructions on >from The j3d.org 3D utility library There is an additional 3D utility library needed to be able to open and work with STL files. Download it from here (right-mouse-click on the Download link in your web browser), and save it in your home directory. Then install it along with the Java3D .jar files (via sudo again): toby stephen george - RepRap Host