This is a special Serializer that Serializes and deserializes byte arrays only, (just returns the byte array unchanged/uncopied)
Java API for creating a Serializer: make sure to include a constructor which takes exactly one argument of type akka.actor.ExtendedActorSystem, because that is the preferred constructor which will be invoked when reflectively instantiating the JSerializer (also possible with empty constructor).
This Serializer uses standard Java Serialization
This is a special Serializer that Serializes and deserializes nulls only
A Serializer represents a bimap between an object and an array of bytes representing that object.