04:57:12,903 PM [testsystem-akka.actor.default-dispatcher-5] [INFO] Slf4jLogger - Slf4jLogger started
04:57:13,131 PM [testsystem-akka.actor.default-dispatcher-5] [INFO] RepointableActorRef - Message [java.lang.String] from Actor[akka://testsystem/system/testActor-30#-938800210] to Actor[akka://testsystem/user/pingpongactor#1212831613] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[akka://testsystem/user/pingpongactor#1212831613] 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'.
04:57:13,131 PM [testsystem-akka.actor.default-dispatcher-5] [INFO] CoordinatedShutdown - Running CoordinatedShutdown with reason [ActorSystemTerminateReason]