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You don't need to put the class files in a jar file to execute them.

Open a command prompt window,
cd to the directory with the class file
enter the command: java TheClassName

If the class...

How many different variables are there to the problem? One is the java program. What are the others?
When and where does the java program work or not work? Is time of day a factor? Is load on the...

I haven't worked with any of the components involved with your problem and have no idea what could be wrong.

The problem sounds like a configuration problem, not a java programming problem.

Are you saying the desktop (where it fails) is wired to the network and the laptop (where it works) is using wifi to connect to the network?

Why is VMware needed?

And executes and shows the problem for testing.

If it requires VMware for testing that will be a problem.
What do you mean by Wifi?

Without an error message, I can't guess what is wrong.

Can you make a small, complete program that compiles, executes and shows the problem?

It's hard to locate a problem without some error messages. Does the code have printStackTrace() calls in the catch blocks?

Are there any error messages that can help showing what the problem is?