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/Java/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/lib/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/vtk-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$NativeLibraryImpl.open(NativeLibraries.java:331) at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:197) at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.java:139) at java.base/jdk.internal.loader.NativeLibraries.findFromPaths(NativeLibraries.java:259) at java.base/jdk.internal.loader.NativeLibraries.loadLibrary(NativeLibraries.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.<clinit>(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
