OSX: stuck in full-screen after java exception

OpenGL Development
#1

Usually, when running full-screen on OSX, it is always possible to leave the app by using cmd-Q.

The problem is when some uncaught Java exception occurs: cmd-Q is not working anymore and the only possibility I found to leave was to shut-down the machine.

Any clues?

Thanks,
Ariel
http://chronotext.org

#2

Catch your exceptions so that the execution of your program doesn’t halt, or do something in your main method like:


// setup windows/fullscreen - which should also check for exceptions, but I won't go into that
try {
   while(true) {
      // do game, if quit requested break out of loop
   }
} finally {
  // tear down fullscreen
}
#3

The point here is not how to protect users from uncaught exception. It is more like: how to make a developer’s life easier, in a world where unpredictable exceptions occur on a daily basis, while developing…

But I see your point: you mean that by putting the “main loop” inside try/catch should catch most of the exceptions and exit gracefully?
Ok, I accept it, but still I wonder what would happen if some exception take place inside another thread (e.g. some http stuff…)

And from a Jogl developer standpoint, it is strange at the first place that cmd-Q cease to work at some point.

Could it be related to the way LWJGL treats full-screen windows on OSX? (and to the point that no “system overlays” appear on top of the screen, e.g. when changing the Mac’s volume?..)

#4

I also had the problem a couple of times and just couldn’t figure out how to get back to my desktop.
So I’m also looking for a keyboard-combo or something to close the Game. Maybe somebody has an Idea?

And since it also happens with Games from other people I can’t change the code, so I’m looking for a way to close the Game without changing the Code. :slight_smile:

#5

There is a lot of weird things going on with Mac’s and windowing. When using LWJGL, I do not remember Cmd-Q ever working, I thought it was something that AWT added. In my experience, most fullscreen games in Mac (such as WoW) don’t respond to Cmd-Q when in fullscreen mode.

Writing just a bit of code to exit gracefully will help with development and will be nicer for users at the same time, although stopping the exceptions would be best :slight_smile:

#6

Actually, Apple provides an API for manually overriding what Command Q does. Take a look at http://developer.apple.com/library/mac/#documentation/Java/Reference/JavaSE6_AppleExtensionsRef/api/index.html . So you can just exit fullscreen mode when handling the quit event.

#7

Thanks, Mr. Gol, for the info but I’m not sure it is relevant.

Right now, the situation with LWJGL on OSX is that the application exits automatically when cmd-Q is pressed.
You don’t have to code anything fancy for that, it behaves just like Alt-F4 on Windows…

The problem is when some uncaught exception occurs: cmd-Q is not working anymore.
I was hoping I could bring Eclipse’s window to the front by using Alt-Tab, but no: I’m stuck in full-screen and the only way out is to turn off the Mac.

Right now, it seems like there is no magic-trick to solve that situation (i.e. without the need to do some preemptive exception catching…)

#8

When an uncaught exception occurs it’s probably the case you accidentally leave your Cmd-Q processing loop and never actually leave the JVM. Not sure though, my Mac’s dead so can’t test :confused:
Remember in LWJGL, Cmd-Q is actually processed by you not by anything else. You have to explicitly detect it and call System.exit()

Cas :slight_smile:

#9

Thanks, and well, it looks like I was not totally aware of this fact…
Part of digesting the LWJGL pill I guess :slight_smile: