01:47:43,935 PM [testsystem-akka.actor.default-dispatcher-5] [INFO] Slf4jLogger - Slf4jLogger started
01:47:44,163 PM [testsystem-akka.actor.default-dispatcher-5] [INFO] RepointableActorRef - Message [java.lang.String] from Actor[akka://testsystem/system/testActor-30#2144944174] to Actor[akka://testsystem/user/pingpongactor#-439899524] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[akka://testsystem/user/pingpongactor#-439899524] 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'.
01:47:44,168 PM [testsystem-akka.actor.default-dispatcher-8] [INFO] CoordinatedShutdown - Running CoordinatedShutdown with reason [ActorSystemTerminateReason]