[vtkusers] Crashes in Java wrapped vtk on linux because of xcb problems

[Clemens Müthing]

Hello everyone,

I am currently developing a Viewer for Volume Renderings using the Java  
Wrappers of vtk.
To complicate things a bit, the Viewer is a plugin for KNIME  
(www.knime.org, a tool to
perform data mining and other tasks using a node based approach) which in  
term is an
extension for eclipse.

Now, the problem is the following: Everytime I run the programm, I can  
easily display
the data, manipulate it etc without a crash as long as the window  
containing the
vtkPanel is open. But when I close the window, at random intervals a crash  
will
occur, giving me only one of the following error messages:

java: ../../src/xcb_io.c:140: dequeue_pending_request: Assertion `req ==  
dpy->xcb->pending_requests failed.
java: ../../src/xcb_io.c:571: _XReply: Assertion `(((long) (req->sequence)  
- (long) (dpy->request)) <= 0)' failed.
java: ../../src/xcb_io.c:515: _XReply: Assertion `!dpy->xcb->reply_data'  
failed.

To ease the problem, I tried to build a minimum example, but this didn't  
help, as that one is not
crashing at all.

So my question would be: Has anyone else have had a similar problem and  
could maybe give me
a hint to where the problem may be? Or, as I don't have a clue how to  
debug this any
further, any tips what I might do to get a little bit more output?

Thanks in advance