review comments (Viktor), see #2376

akka-actor/src/main/resources/reference.conf

@@ -51,7 +51,7 @@ akka {
     provider = "akka.actor.LocalActorRefProvider"
     
     # The guardian "/user" will use this subclass of akka.actor.SupervisorStrategyConfigurator
-    # to obtain its supervisorstrategy. Besides the default there is
+    # to obtain its supervisorStrategy. Besides the default there is
     # akka.actor.StoppingSupervisorStrategy
     guardian-supervisor-strategy = "akka.actor.DefaultSupervisorStrategy"
 

akka-actor/src/main/scala/akka/actor/ActorRefProvider.scala

@@ -411,7 +411,7 @@ class LocalActorRefProvider(
    */
   def registerExtraNames(_extras: Map[String, InternalActorRef]): Unit = extraNames ++= _extras
 
-  private lazy val guardianSupervisorStrategyConfigurator =
+  private def guardianSupervisorStrategyConfigurator =
     dynamicAccess.createInstanceFor[SupervisorStrategyConfigurator](settings.SupervisorStrategyClass, Seq()).fold(throw _, x ⇒ x)
 
   /**

akka-actor/src/main/scala/akka/actor/FaultHandling.scala

@@ -70,11 +70,11 @@ trait SupervisorStrategyConfigurator {
   def create(): SupervisorStrategy
 }
 
-class DefaultSupervisorStrategy extends SupervisorStrategyConfigurator {
+final class DefaultSupervisorStrategy extends SupervisorStrategyConfigurator {
   override def create(): SupervisorStrategy = SupervisorStrategy.defaultStrategy
 }
 
-class StoppingSupervisorStrategy extends SupervisorStrategyConfigurator {
+final class StoppingSupervisorStrategy extends SupervisorStrategyConfigurator {
   override def create(): SupervisorStrategy = SupervisorStrategy.stoppingStrategy
 }
 
@@ -156,7 +156,7 @@ object SupervisorStrategy extends SupervisorStrategyLowPriorityImplicits {
 
   /**
    * This strategy resembles Erlang in that failing children are always
-   * terminated.
+   * terminated (one-for-one).
    */
   final val stoppingStrategy: SupervisorStrategy = {
     def stoppingDecider: Decider = {