12:29:01,716 PM [testsystem-akka.actor.default-dispatcher-5] [INFO] Slf4jLogger - Slf4jLogger started 12:29:02,4 PM [testsystem-akka.actor.default-dispatcher-6] [INFO] RepointableActorRef - akkaDeadLetter Message [java.lang.String] from Actor[akka://testsystem/system/testActor-30#-355957072] to Actor[akka://testsystem/user/pingpongactor#1164212800] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[akka://testsystem/user/pingpongactor#1164212800] 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'.