+sam #13890 Add Akka Main Activator template for Java 8

akka-samples/akka-sample-main-java-lambda/src/main/java/sample/hello/Main2.java

@@ -0,0 +1,28 @@
+package sample.hello;
+
+import akka.actor.*;
+import akka.japi.pf.ReceiveBuilder;
+
+public class Main2 {
+
+  public static void main(String[] args) {
+    ActorSystem system = ActorSystem.create("Hello");
+    ActorRef a = system.actorOf(Props.create(HelloWorld.class), "helloWorld");
+    system.actorOf(Props.create(Terminator.class, a), "terminator");
+  }
+
+  public static class Terminator extends AbstractLoggingActor {
+
+    private final ActorRef ref;
+
+    public Terminator(ActorRef ref) {
+      this.ref = ref;
+      getContext().watch(ref);
+      receive(ReceiveBuilder.
+        match(Terminated.class, t -> {
+          log().info("{} has terminated, shutting down system", ref.path());
+          context().system().shutdown();
+        }).build());
+    }
+  }
+}