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  Shutdown Hook Errors  (Read 2758 times)
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Offline FoMo

Junior Newbie

Java games rock!

« Posted 2004-04-05 21:40:29 »

Hi everyone,

I recently started work on incorporating JOAL into my engine. Things were going really well until they went horribly wrong  Smiley

The problem is that sound gets loaded as an engine module on startup (along with other things like graphics and networking). When startup is complete I register a shutdown hook to make sure that all modules are closed properly.

When shutting down I get the following:

java.lang.IllegalMonitorStateException: Not Owner 

The JVM needs to then be manually killed off as the mutex waits indefinately for the original thread to come back. This is obviously not ideal when I'm just trying to shut the system down cleanly.

Any help or thoughts are much appreciated.
Offline Athomas Goldberg

Junior Devvie


« Reply #1 - Posted 2004-04-09 11:01:19 »

This should be a relaitvely easy fix. I'll take a look at it today.

Athomas Goldberg
Project Lead / Wildcard
Game Technologies Group
Sun Microsystems, Inc.
Offline FoMo

Junior Newbie

Java games rock!

« Reply #2 - Posted 2004-04-09 19:34:52 »

Thank you very much, looking forward to it
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Offline FoMo

Junior Newbie

Java games rock!

« Reply #3 - Posted 2004-04-21 08:45:04 »


Any progress on this?

Offline rinschwinder

Senior Newbie

« Reply #4 - Posted 2005-06-16 12:10:07 »


I have exactly the same Error in my Sound Engine and have no idea how to fix this...  Did someone had success fixing it?
Offline rinschwinder

Senior Newbie

« Reply #5 - Posted 2005-06-23 13:50:46 »

Ok, lets get more detailed! My Sound-Engine ist of course a part of game... At startup an instance of this engine will be created, on which an "INIT"-Method is started, which looks like that:

   public void init() {
        try {
            al = ALFactory.getAL();
        } catch (OpenALException e) {
        if(loadALData() == AL.AL_FALSE) {   

now the game is running until someone presses the "QUIT" button. Beneath other shutdowns in other parts of the game, the Method "destroy" is called on the SoundEngine which looks like this:

 public void destroy() {
        al.alDeleteBuffers(NUM_BUFFERS, buffers);
        al.alDeleteSources(NUM_SOURCES, sources);

The result is the postet Error-Message, instead of a shutdown.... what could there be wrong???
Offline rinschwinder

Senior Newbie

« Reply #6 - Posted 2005-06-26 18:11:22 »

A Friend of mine has fixed the problem! It was quite simple: The Thread which initialised OpenAL is the one who has to destroy the context. Anther Thread isnt allowed to do this, which causes the error!
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