From: dparsons@debian.org   
      
   Package: vtk9   
   Version: 9.5.2+dfsg3-8   
   Severity: normal   
   Control: forwarded -1 https://gitlab.kitware.com/vtk/vtk/-/issues/19960   
      
   Bug#1125167 has revealed an irregularity linking VTK python modules to python.   
   The Rendering::Matplotlib uses python (as matplotlib) via the   
   Wrapping::PythonCore module.   
      
   Accessing within python, Rendering::Matplotlib  loads fine   
   (vtkmodules.vtkRenderingMatplotlib imports successfully in python)   
      
   But loading VTK in java, libvtkRenderingMatplotlibJava cannot be loaded.   
      
   For instance VTK provides a sample java program, CylinderExample.java   
   at https://examples.vtk.org/site/Java/GeometricObjects/CylinderExample/   
   https://gitlab.kitware.com/vtk/vtk-examples/-/blob/master/src/Ja   
   a/GeometricObjects/CylinderExample.java   
      
   Running from java gets an error via the vtkRenderingMatplotlib module   
   because ibvtkWrappingPythonCore is missing a link to libpython   
      
   $ LD_LIBRARY_PATH=/usr/lib/jvm/java-21-openjdk-amd64/lib/:/usr/l   
   b/x86_64-linux-gnu/java/vtk-Linux-x86_64/ java -cp "/usr/share/java/vtk9.jar"    
   CylinderExample.java   
   java.lang.UnsatisfiedLinkError: /usr/lib/x86_64-linux-gnu/java/v   
   k-Linux-x86_64/libvtkRenderingMatplotlibJava.so: /usr/lib/x86_64   
   linux-gnu/java/vtk-Linux-x86_64/../../libvtkWrappingPythonCore3.13-9.5.so.1:   
   undefined symbol: PyExc_ValueError   
   	at java.base/jdk.internal.loader.NativeLibraries.load(Native Method)   
   	at java.base/jdk.internal.loader.NativeLibraries$NativeLibraryI   
   pl.open(NativeLibraries.java:331)   
   	at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(Na   
   iveLibraries.java:197)   
   	at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(Na   
   iveLibraries.java:139)   
   	at java.base/jdk.internal.loader.NativeLibraries.findFromPaths(   
   ativeLibraries.java:259)   
   	at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(Na   
   iveLibraries.java:251)   
   	at java.base/java.lang.ClassLoader.loadLibrary(ClassLoader.java:2451)   
   	at java.base/java.lang.Runtime.loadLibrary0(Runtime.java:916)   
   	at java.base/java.lang.System.loadLibrary(System.java:2063)   
   	at vtk.vtkNativeLibrary.LoadLibrary(vtkNativeLibrary.java:255)   
   	at vtk.vtkNativeLibrary.LoadAllNativeLibraries(vtkNativeLibrary.java:192)   
   	at CylinderExample.(CylinderExample.java:17)   
   	at java.base/java.lang.Class.forName0(Native Method)   
   	at java.base/java.lang.Class.forName(Class.java:536)   
   	at java.base/java.lang.Class.forName(Class.java:515)   
   	at jdk.compiler/com.sun.tools.javac.launcher.Main.execute(Main.java:432)   
   	at jdk.compiler/com.sun.tools.javac.launcher.Main.run(Main.java:208)   
   	at jdk.compiler/com.sun.tools.javac.launcher.Main.main(Main.java:135)   
   vtkRenderingMatplotlibJava not loaded   
      
   This java example does work successfully in the sense that the red   
   cylinder is displayed. But the python error means that java can't load   
   the matplotlib module compiled for java (vtkRenderingMatplotlibJava).   
      
   I imagine Rendering::Matplotlib would generate the same kind of error   
   from C++, but the triggering example at hand is in java.   
      
   Reported upstream,   
   https://gitlab.kitware.com/vtk/vtk/-/issues/19960   
      
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