akka.actor.provider setting in config, can be
Construct an ActorSystemSetup with this setup combined with another one.
If no ClassLoader is given, it obtains the current ClassLoader by first inspecting the current threads' getContextClassLoader, then tries to walk the stack to find the callers class loader, then falls back to the ClassLoader associated with the ActorSystem class.
Configuration to use for the actor system.
If defined the ExecutionContext will be used as the default executor inside this ActorSystem.