Sending a null message will not work, but we can avoid that match error. I
created an issue https://github.com/akka/akka/issues/23215
/Patrik
On Sat, Jun 17, 2017 at 7:25 AM, Konrad “ktoso” Malawski <
konrad.malaw...@lightbend.com> wrote:
> Why are you sending null messages? That’s illegal - end of topic on that
> point.
> Regarding the other one - no idea without you providing more details what
> your system actually is.
>
> — Konrad
>
>
> On June 16, 2017 at 11:47:00 PM, prateek singhal (prateek.itm...@gmail.com)
> wrote:
>
> Hi,
>
> I am getting following exception when I send null message to cluster
> receptionist.
>
> *final ActorRef actor =
> system.actorOf(ClusterClient.props(ClusterClientSettings.create(system)),
> "client");*
> *actor.tell(new ClusterClient.Send("/user/worker", null),
> ActorRef.noSender());*
>
> Moreover any further (non-null) messages send to cluster will pass to
> *dead-letters.*
> *actor.tell(new ClusterClient.Send("/user/worker", "non-null message"),
> ActorRef.noSender());*
>
> Please help me in preventing the same?
>
> Thanks in advance.
>
> Exception:
> [info] [ERROR] [06/14/2017 21:55:18.433]
> [ClusterSystem-akka.actor.default-dispatcher-3]
> [akka://ClusterSystem/system/distributedPubSubMediator] null
> [info] scala.MatchError: null
> [info] at akka.cluster.pubsub.DistributedPubSubMediator$Internal$$
> anonfun$wrapIfNeeded$1.apply(DistributedPubSubMediator.scala:400)
> [info] at akka.cluster.pubsub.DistributedPubSubMediator$$anonfun$
> receive$1.applyOrElse(DistributedPubSubMediator.scala:550)
> [info] at akka.actor.Actor$class.aroundReceive(Actor.scala:497)
> [info] at akka.cluster.pubsub.DistributedPubSubMediator.aroundReceive(
> DistributedPubSubMediator.scala:479)
> [info] at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
> [info] at akka.actor.ActorCell.invoke(ActorCell.scala:495)
> [info] at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
> [info] at akka.dispatch.Mailbox.run(Mailbox.scala:224)
> [info] at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
> [info] at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.
> java:260)
> [info] at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(
> ForkJoinPool.java:1339)
> [info] at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPoo
> l.java:1979)
> [info] at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinW
> orkerThread.java:107)
> [info]
> [info] [INFO] [06/14/2017 21:55:28.418]
> [ClusterSystem-akka.actor.default-dispatcher-2]
> [akka://ClusterSystem/system/distributedPubSubMediator] Message
> [java.lang.String] from Actor[akka://ClusterSystem/sys
> tem/receptionist/akka.tcp%3A%2F%2FClusterClientSystem%40127
> .0.0.1%3A57123%2FdeadLetters#1581143769] to Actor[akka://Cluste
> rSystem/system/distributedPubSubMediator#1686240614] was not delivered.
> [6] dead letters encountered. This logging can be turned off or adjusted
> with configuration
> settings 'akka.log-dead-letters' and 'akka.log-dead-letters-during-
> shutdown'.
> --
> >>>>>>>>>> Read the docs: http://akka.io/docs/
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--
Patrik Nordwall
Akka Tech Lead
Lightbend <http://www.lightbend.com/> - Reactive apps on the JVM
Twitter: @patriknw
--
>>>>>>>>>> Read the docs: http://akka.io/docs/
>>>>>>>>>> Check the FAQ:
>>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html
>>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user
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