jni-example
compile
gcc -shared -fPIC -I/usr/lib/jvm/java-8-oracle/include/ -I/usr/lib/jvm/java-8-oracle/include/linux/ -o libhelloworld.so HelloJNIWorld.c
exec
java -Djava.library.path=./ HelloJNIWorld
gcc -shared -fPIC -I/usr/lib/jvm/java-8-oracle/include/ -I/usr/lib/jvm/java-8-oracle/include/linux/ -o libhelloworld.so HelloJNIWorld.c
java -Djava.library.path=./ HelloJNIWorld