The Scala typed actor documentation is incomplete, it doesn't show you the most important part, how to implement an actor.

http://doc.akka.io/docs/akka/2.2.1/scala/typed-actors.html

The section on creating typed actors shows you how define the interface, but forgets to give an implementation example.

Actually, the interface section shows an empty trait, and the implementation section shows a trait with 4 methods instead of the implementation.