Exception thrown when creating an Akka router following upgrade to Kamon 0.4.0

[Nick Ebbitt]

I've just upgraded from Kamon 0.3 to 0.4 and have hit an issue.

I have a router actor that is created based on config in my application.conf file. On creation of the router the following exception is thrown:

akka.ConfigurationException: configuration problem while creating [akka://ia/user/CoreCoordinator/EvaluationSupervisor/DocumentPropertyEvaluatorManager/DocumentPropertyEvaluator] with router dispatcher [akka.actor.default-dispatcher] and mailbox [akka.actor.default-mailbox] and routee dispatcher [akka.actor.default-dispatcher] and mailbox [akka.actor.default-mailbox]
 at akka.actor.LocalActorRefProvider.actorOf(ActorRefProvider.scala:752) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.dungeon.Children$class.makeChild(Children.scala:206) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.dungeon.Children$class.actorOf(Children.scala:37) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.ActorCell.actorOf(ActorCell.scala:369) [akka-actor_2.10-2.3.9.jar:na]
 at uk.co.datasys.core.actor.evaluation.evaluators.documentproperty.DocumentPropertyEvaluatorManager.updateDocumentPropertyEvaluator(DocumentPropertyEvaluatorManager.java:110) ~[DocumentPropertyEvaluatorManager.class:na]
 at uk.co.datasys.core.actor.evaluation.evaluators.documentproperty.DocumentPropertyEvaluatorManager.processEvaluatorRules(DocumentPropertyEvaluatorManager.java:92) ~[DocumentPropertyEvaluatorManager.class:na]
 at uk.co.datasys.core.actor.evaluation.evaluators.documentproperty.DocumentPropertyEvaluatorManager$$Lambda$179/1850206261.apply(Unknown Source) ~[na:na]
 at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:26) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.japi.pf.UnitCaseStatement.apply(CaseStatements.scala:21) ~[akka-actor_2.10-2.3.9.jar:na]
 at scala.PartialFunction$class.applyOrElse(PartialFunction.scala:118) ~[scala-library-2.10.5.jar:na]
 at akka.japi.pf.UnitCaseStatement.applyOrElse(CaseStatements.scala:21) ~[akka-actor_2.10-2.3.9.jar:na]
 at scala.PartialFunction$OrElse.applyOrElse(PartialFunction.scala:165) ~[scala-library-2.10.5.jar:na]
 at akka.actor.Actor$class.aroundReceive(Actor.scala:465) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.UntypedActor.aroundReceive(UntypedActor.scala:97) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.ActorCell.receiveMessage(ActorCell.scala:516) [akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.ActorCell.invoke_aroundBody0(ActorCell.scala:487) [akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.ActorCell$AjcClosure1.run(ActorCell.scala:1) [na:na]
 at org.aspectj.runtime.reflect.JoinPointImpl.proceed(JoinPointImpl.java:149) [aspectjweaver.jar:1.8.4]
 at akka.kamon.instrumentation.ActorCellInstrumentation$$anonfun$aroundBehaviourInvoke$1.apply(ActorCellInstrumentation.scala:62) [kamon-akka_2.10-0.4.0.jar:0.4.0]
 at kamon.trace.Tracer$.withContext(TracerModule.scala:57) [kamon-core_2.10-0.4.0.jar:0.4.0]
 at akka.kamon.instrumentation.ActorCellInstrumentation.aroundBehaviourInvoke(ActorCellInstrumentation.scala:61) [kamon-akka_2.10-0.4.0.jar:0.4.0]
 at akka.actor.ActorCell.invoke(ActorCell.scala:483) [akka-actor_2.10-2.3.9.jar:na]
 at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:254) [akka-actor_2.10-2.3.9.jar:na]
 at akka.dispatch.Mailbox.run(Mailbox.scala:221) [akka-actor_2.10-2.3.9.jar:na]
 at akka.dispatch.Mailbox.exec(Mailbox.scala:231) [akka-actor_2.10-2.3.9.jar:na]
 at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) [scala-library-2.10.5.jar:na]
 at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) [scala-library-2.10.5.jar:na]
 at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) [scala-library-2.10.5.jar:na]
 at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) [scala-library-2.10.5.jar:na]
Caused by: java.lang.NullPointerException: null
 at akka.kamon.instrumentation.DispatcherInstrumentation.afterCreateExecutorService(DispatcherInstrumentation.scala:101) ~[kamon-akka_2.10-0.4.0.jar:0.4.0]
 at akka.dispatch.ForkJoinExecutorConfigurator$ForkJoinExecutorServiceFactory.createExecutorService(AbstractDispatcher.scala:426) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.dispatch.Dispatcher$LazyExecutorServiceDelegate.executor$lzycompute(Dispatcher.scala:44) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.dispatch.Dispatcher$LazyExecutorServiceDelegate.executor(Dispatcher.scala:44) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.dispatch.ExecutorServiceDelegate$class.execute(ThreadPoolBuilder.scala:212) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.dispatch.Dispatcher$LazyExecutorServiceDelegate.execute(Dispatcher.scala:43) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.dispatch.Dispatcher.registerForExecution(Dispatcher.scala:118) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.dispatch.MessageDispatcher.attach(AbstractDispatcher.scala:133) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.dungeon.Dispatch$class.start(Dispatch.scala:87) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.ActorCell.start(ActorCell.scala:369) [akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.LocalActorRef.start(ActorRef.scala:321) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.dungeon.Children$class.makeChild(Children.scala:220) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.dungeon.Children$class.actorOf(Children.scala:35) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.ActorCell.actorOf(ActorCell.scala:369) [akka-actor_2.10-2.3.9.jar:na]
 at akka.routing.BalancingPool.newRoutee(Balancing.scala:121) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.routing.RoutedActorCell$$anonfun$start$3.apply(RoutedActorCell.scala:116) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.routing.RoutedActorCell$$anonfun$start$3.apply(RoutedActorCell.scala:116) ~[akka-actor_2.10-2.3.9.jar:na]
 at scala.collection.generic.GenTraversableFactory.fill(GenTraversableFactory.scala:91) ~[scala-library-2.10.5.jar:na]
 at akka.routing.RoutedActorCell.start(RoutedActorCell.scala:116) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.routing.RoutedActorCell.start(RoutedActorCell.scala:41) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.RepointableActorRef.point_aroundBody0(RepointableActorRef.scala:105) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.RepointableActorRef$AjcClosure1.run(RepointableActorRef.scala:1) ~[na:na]
 at org.aspectj.runtime.reflect.JoinPointImpl.proceed(JoinPointImpl.java:149) [aspectjweaver.jar:1.8.4]
 at akka.kamon.instrumentation.TraceContextIntoRepointableActorRefMixin$$anonfun$afterRepointableActorRefCreation$1.apply(ActorSystemMessageInstrumentation.scala:77) ~[kamon-akka_2.10-0.4.0.jar:0.4.0]
 at kamon.trace.Tracer$.withContext(TracerModule.scala:57) [kamon-core_2.10-0.4.0.jar:0.4.0]
 at akka.kamon.instrumentation.TraceContextIntoRepointableActorRefMixin.afterRepointableActorRefCreation(ActorSystemMessageInstrumentation.scala:76) ~[kamon-akka_2.10-0.4.0.jar:0.4.0]
 at akka.actor.RepointableActorRef.point(RepointableActorRef.scala:94) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.RepointableActorRef.initialize(RepointableActorRef.scala:82) ~[akka-actor_2.10-2.3.9.jar:na]
 at akka.actor.LocalActorRefProvider.actorOf(ActorRefProvider.scala:750) ~[akka-actor_2.10-2.3.9.jar:na]
 ... 28 common frames omitted

This worked fine previously, does anyone have any ideas what might be causing the problem? Let me know if more details are required.

Cheers

Nick

[Ivan Topolnjak]

Hello Nick,

Thanks for reporting this issue! I just created a ticket for that [1].. while trying to reproduce it, it seems like it only happens if using a balancing-pool router, will fix that as soon as possible and keep you updated, regards!

[1] https://github.com/kamon-io/Kamon/issues/199

[Nick Ebbitt]

Great, look forward to receiving the fix. I'll switch the router to an alternative type for the short-term.

Cheers