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Stopping multiple launches of application

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Hi all,

I have a Windows batch file(.bat) which launches my GUI(Swing) application. I want to make sure only one copy of my application should be running at any time.
For example, assume that I have launched my application by running the batch file. Now if i try to execute the batch file it should not launch application and it should say something like "Application already running".

Please let me know how to achieve this.

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The application could open a ServerSocket on a particular port (say, 5000). If the second instance tries to do the same, it will get an exception, something like "port already in use".
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You may also write a temp file, there is a way to turn a �delete on exit flag� so your file will erase itself when your program exits. Every time you start your process you can try to find the file, if it exists you show your message and exit else you continue the normal way.
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