Re: [gl4java-usergroup] GLCanvas Dispose on NT

[Kenneth B. R. <kbr...@al...>]

> My application needs to swap a GLCanvas and a JPanel in and out of a GUI
> Container(JSplitPane). Currently I am destroying a GLCanvas with cvsDispose
> () and then rebuilding by recalling the constructor with each swap.
>
> ...
>
> On a WinNT machine this call causes a EXCEPTION_ACCESS_VIOLATION outside of
> the Java VM. It is happening in the gljDestroyNative() method in
> OpenGL_Win32_jawt.c when the native disp_wglDeleteContext(gc) call is
> made(Line 713).

There is pretty clearly something wrong in that code, as that
line is executing entirely inside a block guarded by "if (gc ==
0)".

Please spend some time and debug it if you can, then send in a
patch. Otherwise we'll look at it after JavaOne. BTW, Sven is in
San Francisco this week and he and I are giving a talk on OpenGL
for Java this Thursday morning at 11. If any of you are at the
conference we hope to see you there.