jboner/akka — comment on commit 65a9eddbdac3423aa041898e0c73d9252499da00
File: akka-remote/src/main/scala/akka/remote/RemoteExtension.scala line 29
By patriknw:

"But extensions should be loaded at ActorSystem start, not on demand."
I don't agree. ActorSystem should not know about all extensions, not even remoting. That would cause wrong akka-actor dependencies.

It is possible to load them on startup, by defining them in config property "akka.extensions", but that is something that must be done by users, to register their own extensions (and if they prefer to load built in extensions at startup instead of on demand).