cmake .. -DJAVA_INCLUDE_PATH=/usr/lib/jvm/java-8-oracle/include/ -DJAVA_INCLUDE_PATH2=/usr/lib/jvm/java-8-oracle/include/linuxIt was not necessary to set BUILD_SHARED_LIBS to false as described on opencv.org. That would be rather undesirable to lose the ability to use shared libs just because you also want to use Java!
**HOWEVER**, because BUILD_SHARED_LIBS is set, libopencv_java310.so will have dependencies. It will be necessary to load libopencv_core.so.3.1 among others into the JVM at runtime, AND THEN to have libopencv_java310.so see those symbols. This is tricky in Java! If you don't want to go through this pain, you can go and unset BUILD_SHARED_LIBS; I won't judge you.
Essentially, what you need is a way to set RTLD_GLOBAL when loading the library. This can be accomplished using JNA:
NativeLibrary.getInstance(path);Then you should be able to use OpenCV.