[vtkusers] Bug in vtk java wrapper

[Ali -]

Hi,

Running the following java code causes an error detected by hotspot virtual 
machine:

vtkPointSet obj = new vtkPointSet();
obj.GetMTime();

The reason is that vtkJavaGetPointerFromObject() in vtkJavaUtil returns NULL 
and the generated JNI wrapper does not validate the pointer. This error 
happens when the class and/or at least one of the cuper classes are 
abstract. I understand that the user does not need to create an abstract 
class, but, this bug is annoying.

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