JVM does not shut down after shutting down the swing application

Question

I have a rotation application with an exit button that calls a method that calls System.exit (0); but the JVM is not closing for some reason. Does anyone know what might cause the JVM to continue working?

Answer 1

Non-daemon threads will not stop program execution when System.exit() called (and daemon threads will certainly not), but trailing hooks ^{& dagger;} will be if they are not completed.

^{& cross See Shutdown Hooks API Design (the originally linked article is now only available on the return path machine ).}

Swing probably uses interrupts, but not so that your program does not interrupt. But if you (or some library that you use) call Runtime.addShutdownHook() , you must make sure that your shutdowns are not blocked.

By the way, one problem for this problem is to add a disconnect hook that looses another thread that waits sixty seconds, then calls Runtime.halt() . (You will have to unscrew another thread, because otherwise the stop hook, waiting for sixty seconds, will not allow the program to shut down for sixty seconds.)

Answer 2

Perhaps you have Thread that still works?

It is very easy to find which threads work and when. In Netbeans, run your project in profile mode (Alt + F2) to have a real-time snapshot. (Profiler → Browse → Themes)