[vtkusers] VTK+Java Crash while rendering

[Shyam Prakash]

Jeff,
	I completely agree with your reasoning. It is possible that a
paint call is generated while my underlying data is being changed. 

>>	One way to stop the problem is 
>>	to mutex while changing the data and also use the same mutex
when 
>>	rendering.  Basically, both actions require the same lock and so

>>	cannot conflict.  This should prevent a render while the data is

>>	changing.

Do you mean the Lock/UnLock methods of vtkPanel? 

Thanks
Shyam


-----Original Message-----
From: Jeff Lee [mailto:jeff at cdnorthamerica.com] 
Sent: Tuesday, October 28, 2003 5:27 PM
To: Shyam Prakash
Cc: 'vtkusers'
Subject: Re: [vtkusers] VTK+Java Crash while rendering

If you try to render while the underlying data is changing, it is still 
possible to get this type of behavior.  One way to stop the problem is 
to mutex while changing the data and also use the same mutex when 
rendering.  Basically, both actions require the same lock and so cannot 
conflict.  This should prevent a render while the data is changing.
-Jeff

Shyam Prakash wrote:

> Hi,
>
>             I have been facing this problem for quite some time. I am 
> developing an application using vtk 4.2.2 and jdk 1.4.1_02 on windows.
>
> The tool crashes some time with the following error message. However 
> this crash is not reproducible. This always happens in the JVM 
> generated paint() method call. Is there a workaround to stop this
crash?
>
>  
>
> An unexpected exception has been detected in native code outside the
VM.
>
> Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at
PC=0x27123331
>
> Function=vtkFileOutputWindow::NewInstance+0x1A906
>
> Library=C:\WINNT\System32\vtkCommon.dll
>
>  
>
> Current Java thread:
>
>             at vtk.vtkRenderWindow.Render_6(Native Method)
>
>             at vtk.vtkRenderWindow.Render(vtkRenderWindow.java:36)
>
>             at vtk.vtkPanel.Render(vtkPanel.java:137)
>
>             - locked <056CA5D8> (a com.gui.Viewer)
>
>             at vtk.vtkPanel.paint(vtkPanel.java:151)
>
>             at sun.awt.RepaintArea.paint(Unknown Source)
>
>             at sun.awt.windows.WComponentPeer.handleEvent(Unknown
Source)
>
>             at java.awt.Component.dispatchEventImpl(Unknown Source)
>
>             at java.awt.Component.dispatchEvent(Unknown Source)
>
>             at java.awt.EventQueue.dispatchEvent(Unknown Source)
>
>             at 
> java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)
>
>             at 
> java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
>
>             at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
>
>             at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
>
>             at java.awt.EventDispatchThread.run(Unknown Source)
>
>  
>
> Thanks and Regards
>
> Shyam
>
>  
>
>  
>