From which thread should System.exit() be called in a Swing-app?

Question

In a Swing-app is it okay to invoke System.exit() from any thread? (e.g. on the EDT?)

Answer 1

You should not be calling System.exit() if you can help it.

The best way to exit a java process is to let all threads exit normally. This will terminate the VM.

In your main JFrame, you should setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE).

Then you can call frame.dispose() to close the JFrame and exit the EDT.