03:48:02,434 PM [testsystem-akka.actor.default-dispatcher-5] [INFO] Slf4jLogger - Slf4jLogger started
03:48:02,763 PM [testsystem-akka.actor.default-dispatcher-5] [INFO] RepointableActorRef - Message [java.lang.String] from Actor[akka://testsystem/system/testActor-1#-662069122] to Actor[akka://testsystem/user/pingpongactor#-24621493] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[akka://testsystem/user/pingpongactor#-24621493] 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'.
03:48:02,770 PM [testsystem-akka.actor.default-dispatcher-6] [INFO] CoordinatedShutdown - Running CoordinatedShutdown with reason [ActorSystemTerminateReason]