[vtkusers] Lots of crashes when using VTK 4.2.2 from Java 1.3

[R K Shyamprakash]

hi,
	have you tried the test programs given with VTK 4.2 in the folder
Wrapping/Java. check if those programs work fine. also it is important that
you call the Render method given in vtkCanvas and should never call this
method directly. in vtkCanvas, this method takes care of mutex locks. else
can you send me a sample program where the error occurs, i'll check if i
face the same problem.

regards
shyam

-----Original Message-----
From: vtkusers-admin at public.kitware.com
[mailto:vtkusers-admin at public.kitware.com]On Behalf Of Zsolt Zsoldos
Sent: Wednesday, April 30, 2003 8:31 PM
To: vtkusers at public.kitware.com
Subject: [vtkusers] Lots of crashes when using VTK 4.2.2 from Java 1.3


Hi VTK users,

I'm wondering if anybody else is using a similar setup as myself
and whether you encountered the same problems as me. I've
been using VTK3.2 with JDK 1.1.6 on Linux for several years.
I have a Java control window and a separate VTK created 3D
window where I'm using interactor. With that old setup it all
worked fine, although I had to use a lot of "synchronize" statements
in Java without those I was experiencing crashes in X refresh
calls a lot, due to some code re-entrance problems.

Now, I have upgraded to VTK 4.2.2 and JDK 1.3. The problem
is that now I keep getting crashes for every refresh calls
and many other calls as well if I add/remove actors from Java
based on user actions on the Java control window.

So, basically the program starts up, 3D window appears, I get
the 3D scene rendered OK, I can rotate/zoom the 3D view.
But if there is any change orginating from a user action on the
Java control window (basically triggered by a Swing event,
which then makes some VTK calls), then the whole program
crashes. According to the Java runtime output, the problem
that occurs is:

An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : 11 occurred at PC=0x4f290bf8
Function name=glXGetCurrentContext
Library=/usr/X11R6/lib/libGL.so

I am running this on Linux, using the NVidia hardware accelerated
OpenGL library, version 1.0-3123, on XFree86 version 4.2.0.
It is important to note, that the same program was running OK
with VTK3.2 and JDK1.1.6 using the same OpenGL and X version.

I'd like to know if anybody has experienced similar problems and
what would be the solution or work-around for this.

--
Zsolt Zsoldos, zsolt at simbiosys.ca, http://www.simbiosys.ca/
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