How to prevent an application for running multiple times

I have to prevent launching my java application more than once. i.e. if the application is launched and the user tries to launch again, it should simply display an error msg and quit.
I tried using java.util.Prefs but it does not help the cleanup does not occur in case of an abnormal termination. (The Runtime.addShutdownHook does not help as well). Please help asap.

Sir,
Have you tried forum search feature?
"One Application instance" problem has been asked and answered many many time here - and he is easily solved.
Simple solution is to use resource which is cleaned up my operating system for you when application terminates.
This way, resource is released whether application terminates nicely or from nasty crash.
Mr ServerSocket is someone who could help you out here.
When application starts, attempt to listen on a ServerSocket on a well-known port (e.g either hard coded in to, or configured for your app).
Leave ServerSocket listening for duration of application.
If another application instance tries to start on same box, it will not be able to listen on same ServerSocket port - and you can close the app.
In general, try searching before posting: Most questions have been answered many times before - and you'll probably get an answer quicker by searching first than by posting straight out.

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