06:58:52,178 PM [testsystem-akka.actor.default-dispatcher-4] [INFO] Slf4jLogger - Slf4jLogger started
06:58:52,485 PM [testsystem-akka.actor.default-dispatcher-5] [INFO] RepointableActorRef -  akkaDeadLetter Message [java.lang.String] from Actor[akka://testsystem/system/testActor-1#966124008] to Actor[akka://testsystem/user/pingpongactor#1970933308] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[akka://testsystem/user/pingpongactor#1970933308] 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'.
06:58:52,506 PM [testsystem-akka.actor.default-dispatcher-4] [INFO] CoordinatedShutdown - Running CoordinatedShutdown with reason [ActorSystemTerminateReason]