CODEWITHSUNDEEP
javaswingjvm
MBU
MBU

Reputation: 5098

JVM not shutting down after swing application exits

I have a swing application with an exit button that calls a method which invokes System.exit(0); but the JVM doesn't shut down for some reason. Does anyone know what could cause the JVM to continue running?

Upvotes: 4

Views: 3046

Answers (2)

Dan R.
Dan R.

Reputation: 805

Non-daemon threads will not keep the program from terminating when you call System.exit() (and daemon threads certainly won't) but shutdown hooks† will, if they fail to terminate.

† See Design of the Shutdown Hooks API (the originally linked article is now only available at the wayback machine).

Swing probably uses shutdown hooks, but not in a way that would prevent your program from terminating. But if you (or some library you use) call Runtime.addShutdownHook(), you'd better make sure your shutdown hooks don't deadlock.

By the way, one work-around for this problem is to make add a shutdown hook that spins off another thread that waits for sixty seconds, then calls Runtime.halt(). (You have to spin off another thread because otherwise the shutdown hook, by waiting sixty seconds, will prevent the program from terminating for sixty seconds.)

Upvotes: 5

Hilydrow
Hilydrow

Reputation: 918

Maybe you have a Thread that is still running?

It's quite easy to find which threads are running and when. In Netbeans, start your project in Profile mode (Alt+F2) to have a snapshot in real-time. (Profiler -> View ->Threads)

Upvotes: 2

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