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I don't mean to be rude or disrespectful, but the project you've described includes skills learned in chapters 9 and beyond of most Java books while running a Java program from the command line...

Try running your program from the command line.

How are you running the program? If you're running from a command shell, you should be seeing error messages when the program stops working. Or, run the program using a debugger or profiler to see...