Hey Sean, You're right about the message popping up from Windows. I did not try to run the jar on a java VM. Where should I enter the java -cp myJarFile.jar line? I tried in the jar directory on unix and got: Usage: gij [OPTION] ... CLASS [ARGS] ... to invoke CLASS.main, or gij -jar [OPTION] ... JARFILE [ARGS] ... to execute a jar file Try `gij --help' for more information. Furthermore, I never created a myJarFile.jar. From what your code looked like, I thought I was altering the mason.16.jar file. If I need to tweak the code to generate my own jar file if you think that would make a difference, let me know. -Steve