Compile a native library

Generate a header file

cd <PROJECT_ROOT>/src/main/java

javac -h ../../../native/ dev/nhayashida/liberty/jni/sample/JNISample.java

Compile C code

cd <PROJECT_ROOT>/native

- Mac
gcc -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/darwin/" -o libjnisample.jnilib -shared JNISample.c

- Linux
gcc -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/linux/" -o libjnisample.so -shared JNISample.c

Configure a server

cd <PROJECT_ROOT>

mvn install

Set the path to the native library as a JVM option

echo "-Djava.library.path=<PROJECT_ROOT>/native" > \
target/liberty/wlp/usr/servers/nfnavi-api/jvm.options

Run the server

mvn liberty:run-server

Open http://localhost:9080/sample/message with your browser, then a message from C code is shown.