[vtkusers] problems running a vtk java bindings example

[Sebastien Jourdain]

Hi Henry,

It is true that getting and understanding how to get your environment setup
is frustrating and the most complex part, specially for Java developers.
But once you figure it out, that's not a big deal anymore.

I guess you do something like that on your linux box to run your app:

$ export LD_LIBRARY_PATH=/usr/local/natives-Linux-x86_64
$ java -cp /path/to/vtk.jar:/your/jar/file.jar Cone

It seems that you've done what is require for the app to work. But as a
side note, it might be safer to use the dedicated enum to load the native
libraries.

  // -----------------------------------------------------------------
  // 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);
  }

You can also use that enum to make sure the Library that you try to load is
the correct one too.

Seb

On Wed, Oct 28, 2015 at 11:41 AM, Henry Blanco <henry.blanco at cbiomed.cu>
wrote:

> Hello Sebastien, thanks for your reply. Well, I have done what you
> suggested, but still the program does not find the proper native
> library, in this case: "libvtkCommonCoreJava.so".
>
> This library is placed at "/usr/local/natives-Linux-x86_64", and it is
> also packed into the jar file "vtk-6.1-natives-Linux-x86_64.jar". The
> environment variable $LD_LIBRARY_PATH is set to point to that directory
> (as you suggested). Moreover, I have specify those dependencies in my
> Eclipse IDE as well. You can check all these evidences attached to this
> email as small screenshots.
>
> This is the piece of code that is generating the link error. The linker
> stops when processing the statement:
>
> System.loadLibrary("libvtkCommonCoreJava");
>
> --------------------
> import vtk.*;
> public class Cone {
>
> // In the static constructor we load in the native code.
> // The libraries must be in your path to work.
> static {
>
> //      System.loadLibrary("vtkCommonJava");
> //      System.loadLibrary("vtkFilteringJava");
> //      System.loadLibrary("vtkIOJava");
> //      System.loadLibrary("vtkImagingJava");
> //      System.loadLibrary("vtkGraphicsJava");
> //      System.loadLibrary("vtkRenderingJava");
>
>         System.loadLibrary("libvtkCommonCoreJava");
>         System.loadLibrary("libvtkFiltersCoreJava");
>         System.loadLibrary("libvtkIOCoreJava");
>         System.loadLibrary("libvtkImagingCoreJava");
>         System.loadLibrary("libvtkRenderingCoreJava");
> }
> ...
> }// End of the class: Cone
>
> Failing to run such a simple example of this library it's a bit
> frustrating for me. I'm looking forward to overcome this issue just to
> start learning this attractive visualization library.
>
> Thanks in advance.
>
> Henry
> --------------------
> On lun, 2015-10-26 at 11:09 -0600, Sebastien Jourdain wrote:
> > Hi Henry,
> >
> >
> > As you noticed, you will need to unzip
> > the  vtk-6.1-natives-Linux-x86_64.jar file into a directory and add
> > that directory path to your LD_LIBRARY_PATH environment variable. Then
> > the rest, should follow.
> >
> >
> > Seb
> >
> > On Mon, Oct 26, 2015 at 9:48 AM, Henry Blanco
> > <henry.blanco at cbiomed.cu> wrote:
> >         Hello guys, I have set up and compiled VTK through cmake on a
> >         64-bits
> >         Ubuntu 14.04, just to get VTK Java bindings, but I have failed
> >         to run a
> >         simple "Cone.java" example. Specifically, when I try to
> >         execute the
> >         statement:
> >
> >         System.loadLibrary("vtkCommonJava");
> >
> >         The compiler throws the following error:
> >
> >         Exception in thread "main" java.lang.UnsatisfiedLinkError: no
> >         vtkCommonJava in java.library.path
> >                 at
> >         java.lang.ClassLoader.loadLibrary(ClassLoader.java:1886)
> >                 at java.lang.Runtime.loadLibrary0(Runtime.java:849)
> >                 at java.lang.System.loadLibrary(System.java:1088)
> >                 at Cone.<clinit>(Cone.java:17)
> >
> >         --------------------------------------
> >         To specify what my problem is, please, read these comments:
> >
> >         1- The VTK compilation process produced the following .jar
> >         files (both
> >         placed at /usr/local/ directory):
> >                 vtk-6.1.jar
> >                 vtk-6.1-natives-Linux-x86_64.jar
> >
> >         2- The library files "vtkCommonJava.o" is not among those
> >         produced by
> >         the compilation process.
> >         3- The most similar library file to "vtkCommonJava" that I
> >         have found is
> >         "libvtkCommonCoreJava.o", packed into the jar file
> >         "vtk-6.1-natives-Linux-x86_64.jar". I have included this file
> >         into the
> >         "Java Build Path" of my Eclipse IDE, as well as the jar file
> >         "vtk-6.1.jar", but still the program fails to run.
> >
> >         I will appreciate any suggestions on what is missing here to
> >         run the
> >         java example. Thanks in advance.
> >
> >         Henry
> >
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