This is Java SDK for Stateful.

The JavaDoc is here.

First, register an account at Stateful. Then, you can create a counter and increment it:

import co.stateful.Counter;
import co.stateful.Counters;
import co.stateful.Sttc;
import co.stateful.RtSttc;
import com.jcabi.urn.URN;
public class Main {
  public static void main(String... args) {
    Sttc sttc = new RtSttc(
      new URN("urn:github:526301"),
      "9FF3-41E0-73FB-F900"
    );
    String name = "test-123";
    Counters counters = sttc.counters();
    Counter counter = counters.create(name);
    long value = counter.incrementAndGet(1L);
    System.out.println("new value: " + value);
    counters.delete(name);
  }
}

Here is how you can use a lock:

Locks locks = sttc.locks();
Lock lock = locks.get("test-lock");
new Atomic(lock).call(
  new Callable<Void>() {
    @Override
    public void call() {
      // perfectly synchronized code
      return null;
    }
  }
);