This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Now the problem is not with all that code. The problem is with your script.
CLASSPATH is probably the problem. The client, server and RMI Registry all need access to the classes.
For local testing it is easiest to have every class on the CLASSPATH.
Then when all is working, you can separate classes.