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I always wanted to make some JNI !

socket example

gcc -fPIC -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/linux" -shared -o src/main/c/libsocket.so src/main/c/generic.Socket.c
./gradlew socketExample

sudo $JAVA_HOME/bin/java -Djava.library.path=./src/main/c -jar build/libs/native-playground-socket-1.0-SNAPSHOT.jar

tun/tap example

In order to run tun/tap example you need to perform following steps (you need linux :/ ):

gcc -fPIC -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/linux" -shared -o src/main/c/libtuntap.so src/main/c/linux.TunTap.c

./gradlew tuntapExample

#yeah, you need sudo, setcap didn't work for me :) but you can try to do that.
sudo $JAVA_HOME/bin/java -Djava.library.path=./src/main/c -jar build/libs/native-playground-tuntap-1.0-SNAPSHOT.jar

sudo ip addr add 192.168.0.1/24 dev tun0
sudo ip link set up dev tun0

rescue

because we are working around virtual interfaces, it is possible that we will left mess there :D this is set of quite helpful commands (at least for me):

sudo ifconfig tun0 down
sudo ip link delete tun0