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Asked: 2026-06-18T11:12:07+00:00

I have 2 general questions here: Firstly, say I have 2 java programs running.

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I have 2 general questions here:

Firstly, say I have 2 java programs running. Almost like a responder and an executor.

The executor can issues commands, requests and the such from the responder. I know it is possible to have them both packed as one program through multi-threading, but necessarily there might not be just 1 responder, there could be 3, maybe even 0 responders.

What is the best way for the 2 programs to ‘communicate’ such as a stream, implying I have no access to the other adapters?

The second question:

Is there a way to check to see if a Java program is open already? So if I run a program, I can’t run it a second time if the first is still running.

Thanks

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1 Answer

  1. Editorial Team

    1. You must explicitly code a socket-based solution. Today I guess REST would be the most obvious choice. A more heavyweight solution would be something JMS-based (involving a standalone message queue, also socked-based).

    2. Yes, there is a way, but nothing out of the box. It usually involves creating temporary files that are checked for existence. There are some handy methods provided, like createTemporaryFile and deleteOnExit that take care of the low-level work.

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