AppInstances

Not really.

But if you reduce the idle timeout from 1200 seconds (20 minutes) in the application.xml settingsfile you can let FMS remove empty instances after say 180 seconds (3 minutes). That's pretty fast. That's our current setting. It doesn't require an application.shutdown(). You could experiment with settings of say 60, 30 or even 10 seconds. See you own PDF docs or open your application.xml and look through the various very interesting settings that can be tweaked.

I 've solved it that way, too. But i thought there would be an diffrent solution.
Thank you, anyway.

Yup... that's been the case since version 1. I've found that GC tends to kill instances that have been idle for 20 minutes or more, but I've also found that sometimes GC misses instances.

What I like to do is have my SSAS take care of it by invoking application.shutdown when all of the clients are gone. Typically, I'd do this in the application.onDisconnect handler... something like this:

application.onDisconnect = function (){
if (application.clients.length < 1){
application.shutdown();
}
}
}