Bug#1125167: SPAM: Bug#1125167: vtk9: libucs crashes the JVM

[Jean-Max Redonnet]

Hi Drew!

For the moment I do not have enough space on my disk to install a 
virtual machine running forky. Sorry.

Getting an example reproducing the problem is quite easy: Once vtk9 and 
libvtk9-java are properly installed with dependencies, just grab any 
java example from https://examples.vtk.org/site/Java/

Compile it, run it and admire the crash... At least if your computer 
acts exactly as mine.

As an example, you can try with:

import vtk.vtkActor;
import vtk.vtkCylinderSource;
import vtk.vtkNamedColors;
import vtk.vtkNativeLibrary;
import vtk.vtkPolyDataMapper;
import vtk.vtkRenderer;
import vtk.vtkRenderWindow;
import vtk.vtkRenderWindowInteractor;

// Then we define our class.
public class CylinderExample {
   private static final long serialVersionUID = 1L;

   // -----------------------------------------------------------------
   // Load VTK library and print which library was not properly loaded
   static {
     if (!vtkNativeLibrary.LoadAllNativeLibraries()) {
       for (vtkNativeLibrary lib : vtkNativeLibrary.values()) {
         if (!lib.IsLoaded()) {
           System.out.println(lib.GetLibraryName() + " not loaded");
         }
       }
     }
     vtkNativeLibrary.DisableOutputWindow(null);
   }
   // -----------------------------------------------------------------

   // now the main program
   public static void main(String args[]) {
     vtkNamedColors colors = new vtkNamedColors();

     // Here is how you create your own named color.
     double bkgColor[];
     bkgColor = new double[]{0.1, 0.2, 0.4, 1.0};
     // This corresponds to the unsigned char array
     // {26, 51, 102, 255} seen in C++ code for setting
     // colors not in vtkNamedColors.
     colors.SetColor("BkgColor", bkgColor);

     // Now we use our own named color.
     double bkg[] = new double[4];
     colors.GetColor("BkgColor", bkg);

     //For Actor Color
     double actorColor[] = new double[4];
     colors.GetColor("Tomato", actorColor);
     //Renderer Background Color

     // This creates a polygonal cylinder model with eight 
circumferential facets
     // (i.e, in practice an octagonal prism).
     vtkCylinderSource cylinder = new vtkCylinderSource();
     cylinder.SetResolution(8);

     // The actor is a grouping mechanism: besides the geometry (mapper), 
it
     // also has a property, transformation matrix, and/or texture map.
     // Here we set its color and rotate it around the X and Y axes.
     vtkPolyDataMapper cylinderMapper = new vtkPolyDataMapper();
     cylinderMapper.SetInputConnection(cylinder.GetOutputPort());

     vtkActor cylinderActor = new vtkActor();
     cylinderActor.SetMapper(cylinderMapper);
     cylinderActor.GetProperty().SetColor(actorColor);
     cylinderActor.RotateX(30.0);
     cylinderActor.RotateY(-45.0);

     // The renderer generates the image
     // which is then displayed on the render window.
     // It can be thought of as a scene to which the actor is added
     vtkRenderer ren = new vtkRenderer();
     ren.AddActor(cylinderActor);
     ren.ResetCamera();
     ren.GetActiveCamera().Zoom(1.5);
     ren.SetBackground(bkg);

     // The render window is the actual GUI window
     // that appears on the computer screen
     vtkRenderWindow renWin = new vtkRenderWindow();
     renWin.AddRenderer(ren);
     renWin.SetSize(300, 300);
     renWin.SetWindowName("Cylinder");


     // The render window interactor captures mouse events
     // and will perform appropriate camera or actor manipulation
     // depending on the nature of the events.
     vtkRenderWindowInteractor iren = new vtkRenderWindowInteractor();
     iren.SetRenderWindow(renWin);

     renWin.Render();

     iren.Initialize();
     // This starts the event loop and as a side effect causes an initial 
render.
     iren.Start();
   }
}

Hope this help.

Regards,

jMaxR