Use static C++ library in Eclipse for Java

Question

I would like to use an existing static C++ library in my Java program. I read that it should be possible . And the steps would be (nearly) the same as for linking dynamic libraries . Unfortunately if I try to load the library with:

static { 
    System.loadLibrary("mylibrary");    
}

I get an exception:

Exception in thread "main" java.lang.UnsatisfiedLinkError: no mylibrary in java.library.path

I tried setting the java.library.path before the System.loadLibrary call manually, but it does not help:

System.setProperty("java.library.path", "/workspace/LibraryTest/lib/");

Setting LD_LIBRARY_PATH in run configurations for the project does also not fix the problem. I get the same error. For shared libraries it works fine though. Currently I'm using Oracle Java8 in Eclipse Mars on Debian Jessie. Does the library need to hava a JNI_OnLoad_mylibrary method? Anyone experienced similar problems?

EDIT

tried /usr/lib directory and added JNI_OnLoad_mylibrary . No success.

Answer 1

Perhaps your code isn't relocatable? That seems like it might upset the JVM. Recompile with -fPIC and see what happens.

From the answer to the other question, you need JNI_OnLoad_name-of-your-library to be defined in the binary for this to work. Did C++ name mangling ruin your day? You'll probably need to extern "C" that function for it to be findable to the JVM.