问题 While akka has documentation regarding binary compatibility for drop in jar replacement, I can't find anything regarding protocol binary compatibility. At the basic level, the actor API is a mailbox of messages. Therefore as long as the messages stay binary compatible there's every possible that messages can be sent to other systems running different (jar-incompatible) versions of akka. So given: 2 applications with a fixed message set No Typed actors (only using actor ! message and actor ?