[vtkusers] JVM Crashes while Call vtkGlobalJavaHash.DeleteAll() in Ubuntu...

[Sebastien Jourdain]

Hi Sathish,

after some digging on what was going on with your code, I've figured out
that the memory leak you were facing while using the VTK garbage collector
was mainly due to Java who keep a reference to any graphical components that
have been shown at some point.

And in your case, your graphical frame keep a reference to all your VTK
objects (readers, filters, renderers...). And because of that, VTK could
never release them.

In order to solve your specific issue you have to have some code like that
in your WindowClosed listener:

private void formWindowClosed(java.awt.event.WindowEvent evt) {
     this.myVtkObjectA = null;
     // [...]
     this.myVtkObjectZ = null;

     // but also remove the content of you renderer that will keep
     // the whole pipeline alive in the C++ layer if not cleared

     this.myVtkPanel.RemoveAllViewProps();
     this.myVtkPanel.GetRenderer().RemoveAllLights();

this.myVtkPanel.GetRenderWindow().RemoveRenderer(this.myVtkPanel.GetRenderer());
}

As you may see for vtkPanel we have a similar issue where its internal
component won't be released, and for now in order to reduce the memory leak
you need to execute the lines that I've put above with "myVtkPanel".

But in a near future, we will add a Delete() method on the vtkPanel to fully
release its internal objects so the code block could be reduced to
: this.myVtkPanel.Delete();

Moreover, Jeff and I are working of documenting the Java part of VTK and
providing some tools to help identifying the cause of memory leak in Java as
well as improving the concurrency support/management. So if some community
member has Java/VTK testing code that produce error/crash because of
concurrency or memory leak that could be used as test, please send them to
us so we can make sure that the improvement that we are making will solve
your issue.

Thanks,

Seb


On Wed, Apr 27, 2011 at 8:30 AM, Sebastien Jourdain <
sebastien.jourdain at kitware.com> wrote:

> Hi Sathish,
>
> Do you think you can share your source code (offlist) so I can give a look
> and understand why you are facing this issue.
>
> Thanks,
>
> Seb
>
> On Wed, Apr 27, 2011 at 2:07 AM, Sathish kumar <kingvsk at aol.com> wrote:
>
>>   Hi Sebastien,
>>
>> Thanks for your response.
>>
>>     I developed a simple application that loads a list of dicom images and
>> construct them as 3D.  It works fine. I call VTK from my Java Application.
>> If I press a button from main window, then the VTK output will load in
>> another Jframe window. Once I close the output window the VTK should release
>> all the memory. But i doesn't do that. It will be released only when I close
>> my main application. (Please refer the attachment).
>>
>> My Requirement is while I close the 3D window The VTK memory should be
>> released.
>>
>>   With Regards,
>>
>> Sathish Kumar V
>>
>>
>
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