[vtkusers] crash: EXCEPTION_ACCESS_VIOLATION error in native code outside th e Java VM
jeff at cdnorthamerica.com
Fri Sep 20 06:56:07 EDT 2002
Are you using vtk4.0 release or vtk4.x? There are a couple of possible
solutions to your problem. The first rule is to NEVER call
vtkRenderWindow.Render() directly from java. You should always use
vtkPanel's Render() method which does the appropriate mutex locking of
the awt drawing surface. The problem stems from the fact that X is not
thread safe and that attempts to modify the drawing surface from
different threads can cause this behavior. The most rigorous way to
ensure this never happens is to place mutex locks around all methods
which can possibly modify the drawing surface. vtkRenderWindow.Render()
is one of these methods. Any method that calls glxMakeCurrent() is also
a candidate for locking. vtkPanel tries to do this locking for you in
places where problems are known to exist. First try using
vtkPanel.Render() directly instead of vtkRenderWindow.Render(). If the
problem still occurs, then expose two public methods on vtkPanel called
lock() and unlock() which just call Lock() and UnLock() respectively.
Now you can place a lock/unlock around your button press event and see
if it fixes the problem. Please let me know if this fixes your problem.
Lichan.Hong at parc.com wrote:
>I have been building my application using the VTK Java interface. Recently, my
>system crashes frequently, resulting in the following error message:
>An unexpected exception has been detected in native code outside the VM.
>Unexpected Signal : EXCEPTION_ACCESS_VIOLATION occurred at PC=0x23A73EFD
>NOTE: We are unable to locate the function name symbol for the error
> just occurred. Please refer to release documentation for possible
> reason and solutions.
>Current Java thread:
> at vtk.vtkPointSet.GetPoints_13(Native Method)
> at vtk.vtkPointSet.GetPoints(vtkPointSet.java:64)
> at MyFilter.executeMethod(MyFilter.java:81)
> at vtkPanel.RenderInternal(Native Method)
> at vtkPanel.render(vtkPanel.java:157)
> - locked <02F4E1D0> (a vtkPanel)
> at java.awt.Button.processActionEvent(Button.java:381)
>Essentially, what I try to do is: when a certain button is pressed, it triggers an animation. During
>this animation, class "MyFilter" deforms a piece of geometry and then I call render() of vtkPanel
>to generate a new frame. "MyFilter", a subclass of vtkPragrammableFilter, is a simple class
>that I wrote. Its method "executeMethod()" preforms the geometry deformation.
>Since my animation is running in a sequential manner:
> geometry update
> geometry update
>I am deeply puzzled by the above error message.
>Any helps will be greatly appreciated.
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