10:18:12,28 AM [testsystem-akka.actor.default-dispatcher-5] [INFO] Slf4jLogger - Slf4jLogger started
10:18:12,257 AM [testsystem-akka.actor.default-dispatcher-5] [INFO] RepointableActorRef - Message [java.lang.String] from Actor[akka://testsystem/system/testActor-51#1751097110] to Actor[akka://testsystem/user/pingpongactor#-1888801550] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[akka://testsystem/user/pingpongactor#-1888801550] may have terminated unexpectedly. This logging can be turned off or adjusted with configuration settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-shutdown'.
10:18:12,258 AM [testsystem-akka.actor.default-dispatcher-5] [INFO] CoordinatedShutdown - Running CoordinatedShutdown with reason [ActorSystemTerminateReason]