Java ShutDownHook not being fired on Windows

Question

Ive got the following ShutdownHook to detect when the application is exited:

    Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
        public void run() {

            // Do what you want when the application is stopping
            sendMsg("", "goOfflineExit", "12");
        }
    }));

This works perfectly on Mac os but for some reason nothing gets fired on Windows.

Any ideas what im missing?

By what proof is it not getting triggered? Maybe it's just failing when it runs. — Marko Topolnik, Sep 01 '13 at 13:31
But more importantly, if you are using shutdown hooks for business logic, then that is your main problem. They are a last-resort mechanism with no helpful guarantees. — Marko Topolnik, Sep 01 '13 at 13:33
@Marko....No marko even in my case too the situation is same — Prateek, Sep 01 '13 at 13:35

score 3 · Accepted Answer · answered Sep 01 '13 at 13:26

I can think of two possible explanations:

The sendMsg(...) call may be happening too late; e.g. after streams have been closed or flushed.
The sendMsg(...) call may be throwing an exception. Uncaught exceptions thrown in a shutdown hook typically don't get reported.

If you showed us the code of sendMsg we might be able to figure out a more definite answer.

Java ShutDownHook not being fired on Windows

1 Answers1