Is there any way to load just ONE java application at the same time?

I'm using 'jnlp' to load java applications and I want to load just one application at the same time.
Is there any way to do that?
I have been trying to use 'findLoadedClass' but it doesn't work.
Also I've tried to make a file when a application is loading and delete when the application exits.
but it has a problem when the user terminates the application.
(the file can't be deleted...)
The applications are using socket to receive data, all of them uses same port. That's why I want to load just one application at a time, otherwise they work wrong way.

Do you actually mean you want to make sure that only one instance of a GIVEN Java program is running at one time? If so then search this forum becuse this question comes up frequently.

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Is there any way to load just ONE java application at the same time?

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