Resizing a Java 3D canvas on Win95 crashes the application -- 1.2 JDK

travis.bryson@Eng 1998-08-26

Resizing a Java 3D canvas on Win95 crashes the application every time. This
doesn't happen on Windows NT or Solaris. There is an access violation generated in opengl32.dll.

I have included a simple sample program in the comments section that
reproduces this bug. The sample program does not use any Java 3D. The
sample program works on Windows NT but crashes on Win95 when a window
resize is attempted. I have also included commented out Solaris code
to run the program on Solaris, where it works fine. I have been using
JDK 1.2 Beta 4. The sample program only makes a single native call,
which sets the pixel format and creates and attaches an OpenGL context
to the window at startup. It brings up a blank Frame that will generate
an access violation when a resize is subsequently attempted.

Java 3D extends Canvas into a Canvas3D and renders into it using native
OpenGL. The sun.awt.Win32DrawingSurface interface is used to get the
window handle. The sample program does the same thing.

Java 3D on top of OpenGL/Win95 is not usable for real applications on the
Win95 platform until this problem is fixed. Many of our customers have
complained about this bug. The sample program uses a Frame, but the same
thing happens with appletviewer, also. I haven't tried it on Win98.

An alternate way to reproduce this bug is to download Java3D/OpenGL for
win32 and resize any example program on Win95.

The win95 stack trace looks like an uninformative kernel trap:
  ! OpenGL32
  ! Kernel32
  ! Kernel32