Akka: Cleanup of dynamically created actors necessary when they have finished?

Question

I have implemented an Actor system using Akka and its Java API UntypedActor. In it, one actor (type A) starts other actors (type B) dynamically on demand, using getContext

Answer 1

Actors by default do not consume much memory. If the application intends to use actor b later on, you can keep them alive. If not, you can shut them down via poisonpill. As long your actors are not holding resources, leaving an actor should be fine.