[vtkusers] Re: problems with VTK and Java / is vtk thread safe

[Jeff Lee]

Peter,
vtkPanel loads all the libraries in a static block, so you don't need 
the load in your Test.java.
-Jeff

Peter J. Carr wrote:

> I solved my problem but am still open to answers to my questions.
>
> My code looked like the following:
>
>    class Test {
>          public static void main(String args[]) {
>              //load all of the vtk libraries
>              System.loadLibrary("vtkCommonJava");
>
>
>             // put a vtkPanel in a frame
>             vtkPanel p = new vtkPanel();
>             Frame f = new Frame();
>             f.add(p);
>             f.pack();
>             f.show();
>          }
>    }
>
> After  removing  the loadLibrary statements the program runs without 
> crashing.
> So the new question:
>    Why would loading the library in my main program cause me to have 
> problems interactive with the vtkPanel?
>
> The answer isn't urgent since my code is now working.
>
>
>
> Peter J. Carr wrote:
>
>> I am having problems running vtk code from a java application on my 
>> linux machine.
>> I am still trying to identify the cause of the problem.
>> The symptom is the java program crashes with the following message:
>>
>> An unexpected exception has been detected in native code outside the VM.
>> Unexpected Signal : 11 occurred at PC=0x4ac5f197
>> Function name=Azimuth__9vtkCamerad
>> Library=/home/pcarr/Projects/vtk/VTK/lib/libvtkRendering.so
>>
>> Current Java thread:
>>   at vtk.vtkCamera.Azimuth_23(Native Method)
>>   at vtk.vtkCamera.Azimuth(vtkCamera.java:104)
>>   at vtkPanel.mouseDragged(vtkPanel.java:178)
>>   at java.awt.Component.processMouseMotionEvent(Component.java:3759)
>>   at java.awt.Component.processEvent(Component.java:3548)
>>   at java.awt.Component.dispatchEventImpl(Component.java:2593)
>>   at java.awt.Component.dispatchEvent(Component.java:2497)
>>   at java.awt.EventQueue.dispatchEvent(EventQueue.java:339)
>>   at 
>> java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:131) 
>>
>>   at 
>> java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:98) 
>>
>>   at 
>> java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
>>   at java.awt.EventDispatchThread.run(EventDispatchThread.java:85)
>>
>> I suspect it has something to do with X/Motif - Java - VTK threads. 
>> But I am not sure how to narrow it down.
>>
>> Questions:
>>   1. Has anyone else seen this type of error? How did you get around it?
>>   2. How do I find out more about threads in X libraries, 
>> specifically how do I make sure that threads are enabled when I start x.
>>   3. Is vtk thread safe by default. I have noticed on some marginally 
>> related news groups mention of the -D_REENTRANT flag being used 
>> during compilation of C and C++ libraries. Is this something that is 
>> needed to build the VTK Java shared libraries?
>>   4. Is there something I need to do from my java application to 
>> prevent this kind of bug?
>>
>> Thanks,
>> Peter Carr
>>
>>
>>
>>
>>
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>
>
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