01:52:13,603 PM [testsystem-akka.actor.default-dispatcher-6] [INFO] Slf4jLogger - Slf4jLogger started
01:52:13,827 PM [testsystem-akka.actor.default-dispatcher-6] [INFO] RepointableActorRef - Message [java.lang.String] from Actor[akka://testsystem/system/testActor-30#885076824] to Actor[akka://testsystem/user/pingpongactor#-1742199725] was not delivered. [1] dead letters encountered. If this is not an expected behavior then Actor[akka://testsystem/user/pingpongactor#-1742199725] 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'.