This sample is meant to be used by studying the code; it does not perform any astounding functions when running it. If you want to run it, check out the akka sources on your local hard drive, follow the instructions for setting up Akka with SBT. When you start SBT within the checked-out akka source directory, you can run this sample by typing
akka-sample-hello/run
You can read more in the Akka docs.