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

[Sebastien Jourdain]

Hi Clemens,

if you are using vtk 5.8, can you try to call Delete() on your
vtkPanel/vtkCanvas before the window get closed by using a window
observer or something like that,
and let me know if that solve your issue.

Thanks,

Seb

On Mon, Nov 28, 2011 at 2:09 PM, Luke Dodd <luke.dodd at gmail.com> wrote:
> Hi Clemens,
>
> I've had these errors before on Linux, and like you had difficulty
> ever producing a small example.
>
> Are you using vtkPanel or vtkCanvas? I have various theories, but I'm
> not 100% sure about any of them. I think it could be to do with
> vtkActors not being informed that the opengl context is no longer
> "good" but still attempting to clean up native resources. What I did
> conclude is that there is something "off" with vtkPanel/Canvas.
>
> To side step this I actually made my own vtkCanvas, it uses LWJGL to
> set up a opengl context painting to a java panel, and then get vtk to
> use that OpenGL context using a slightly tweaked
> vtkGenericRenderWindow class. This, so far (no crashes for a few
> weeks) has solved the issue.
>
> If you (or anyone else) are interested I could clean up this code a
> little and put it on github. I'd be very happy to do this since if it
> worked for you a) I would feel better about the stability of my own
> code and b) if what I've done does actually "fix" it we'd be closer to
> finding out the actual problem!
>
> (Sorry for the multiple emails Clemens, I forgot to hit reply all - I
> want the rest of this list to see this too)
>
> Best Regards,
> Luke Dodd
>
>
> On 25 November 2011 15:52, Clemens Müthing
> <clemens.muething at uni-konstanz.de> wrote:
>>
>> 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
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