Help!! Native Errors

Java 2D
#1

Hi can someone help me?

I have started programming a game in Java - its seems ok although im not too happy with the framerate.

Anyway more to the point, my game works fine except sometimes i get native errors when the game finishes (by sometimes i mean inconsistently; sometimes the same code doesnt produce errors)

A stack trace reveals that the error occurs when the VM tries to dispose of images.

I am using BufferStrategy for rendering and getImage to get gifs to draw.

Please help if you can!

Thanks a lot

#2

Hello! What version of the JVM are you using? The latest official release is 1.4.1_02 and there is a 1.4.2 beta out. Both of those have relatively few issues with crashing on exit. As for performance, try taking a look at the following two libraries for examples of high speed Java2D:

GAGE - http://java.dnsalias.com (My own)
Planetation - http://www.scottshaver2000.com/template/template.php?page=planetation_main (ZParticle’s)

#3

also, more directly relating to the crashes…

how are you closing down the application?

I’ve experienced similar improper closing down of the render pipeline when calling System.exit();

the solution, is to get the awt Thread to die naturally. By that I mean release all windows/frames etc from their native resources (by calling dispose()), and wait for the awt Thread to terminate itself.

I don’t know how this differs from an System.exit() call, but it seems a much cleaner way of disposing of the awt Thread (and Objects).

(1 problem I have noticed with this technique however, is that if u use the null parent constructor of a JWindow/JDialog, the awt thread will never terminate.
This is because a new anonymous Frame is created to act as the parent, and there is no way of disposing of this parent.)

#4

Well, that and any sound contexts you might have opened. Once you start using JavaSound, you’re kind of SOL on automatic thread death. What I usually do is to dispose of everything I can (including the JFrame and all sound Lines), then make a call to System.exit(). If you did your cleanup correctly, you should exit cleanly. If you failed, then you crash. Seems to work pretty well. :slight_smile: