B4J Question Stop a second instance of a non ui application?

[tuicemen]

As posted in another thread
Is there away to disallow multi instances from running?

For a release build you can use launch4j to prevent a non UI or even a UI program from loading a second instance.
However I was wondering if this could be accomplished someway in the code currently?

 

[Erel]

Are you implementing a server?

 

[tuicemen]

yes

 

[Erel]

The server should fail to start if there is already a running server that listens to the same port. You can use Try / Catch to catch the error and close the second instance.

 

[tuicemen]

Ok I had tried that but probably had it in the wrong place.