Steve, I couldn't fathom a guess as to what's going on without actually seeing the jar file.

"A Java Exception has occurred" is not something a Java VM would say.  This sounds like some kind of pop-up dialog box made by OS X or Windows or whatnot.  What happens when you say 

	java -cp myJarFile.jar



On Apr 1, 2013, at 6:58 PM, Steve Kraska wrote:

> Hey Sean, 
> Thanks for all of the help. You answer was very thorough and informative. I tried 
> running those four steps that you have listed but   when I tried to run the newly 
> updated jar file, it simply tells me that "A Java Exception has occurred." 
> This does not happen with the jar file that exists initially in the mason folder, so I 
> was wondering if there was something missing in the fourth step you listed. Do I 
> need to include the external libraries you mentioned that were not added in order 
> to get around this exception? Is it a potential problem with using Mason version 
> 16? I can't quite figure out what is wrong.
> Thank you again,
> Steve