How start an api from one JVM and stop it from another ?

Hi all,
I want just one instance of a program. Thus I need constroled if an instance of this tools already exists. But from an other JVM, how can I do this ?

The question in your title doesn't match the one in the body of the post. I'm guessing you want to prevent multiple copies of your application from running concurrently on the same box.
Create a ServerSocket on a specific port upon start up. If it's successful, you have effectively locked a Mutex for your application. If it's unsuccessful, you can make the assumption that another instance of your application is already running so you should exit.
-S

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