Pytorch C++ with Java Native Interface (JNI) linking error

Hi, I am running into a linking problem when running Torch with JNI. I am not sure if this is the right forum as it might not be directly related to torch but maybe someone might be able to help me:

I have a java program that has native functions declared which are implemented in torchJNI.cpp and defined in torchJNI.h. Of course, for this to work I also load torchJNI with System.loadLibrary("torchJNI");
This works when I create tensors in the native functions and print them etc. The problem comes, when I do more complex things (loss.backward() and optim.step()). In particular, functions that depend on the MKL shared library where the .so files are in /opt/intel/…/.
I implemented a main function in torchJNI.cpp which does training. When compiling and running the torchJNI.cpp file this all of this works perfectly fine. However, when I make a shared library out of torchJNI.cpp/torchJNI.h which gets loaded with JNI and4 I try to run the native method that “has the exact same code” as the main function I get the following error:

INTEL MKL ERROR: /opt/intel/mkl/lib/intel64/ undefined symbol: mkl_lapack_dspevd.    
Intel MKL FATAL ERROR: cannot load or

now I though okay I have to do the same thing to load this shared library, so I added the following lines to the java file:


Now, when I try to run the java file I get:

Exception in thread "main" java.lang.UnsatisfiedLinkError: /opt/intel/mkl/lib/intel64/ /opt/intel/mkl/lib/intel64/ undefined symbol: mkl_lapack_dspevd ....

note, that I run Java with -Djava.library.path=:./path/to/torchJNI/:/opt/intel/mkl/lib/intel64
I looked, and both and are present in /opt/intel/mkl/lib/intel64.

To summarize:

  1. Everything seems to work fine (compilation and runnning) as long as I stay completely in C++.

  2. When I invoke a native function from java that only does simple Torch things that do not require mkl everything also works.

  3. When I invoke a native function from java that uses the torch function backward (for example) I get an INTEL MKL ERROR … undefined symbol: mkl_lapack_dspevd

  4. Trying to fix 3. I tried loading or in Java manually then the error messages changes to a java exception.

Can anyone help me out or take a guess what the problem may be?