If you want to show that the JVM can do that, a better link is probably Akka: http://akka.io/ Your link appears to be a guy's personal project, which is great, but akka is from what I gather an industrial-strength implementation.

Though as the Node people occasionally point out, it is advantageous to have this sort of thing baked into the language, so that everything done in the language supports the concepts, rather than having a relatively small corner support it. Plus you get Go, instead of Java, which I for one would find an improvement.