Thanks Patrick.
Yes it is. During recovery - One of the event persisted in (possibly)
having a null field.
This thread can be closed.
On Thu, Nov 2, 2017 at 2:37 PM, Patrik Nordwall <patrik.nordw...@gmail.com>
wrote:
> Isn’t it thrown from PersistentDeviceActor.scala:183 ?
>
> /Patrik
>
> tis 31 okt. 2017 kl. 20:34 skrev <prashanth.ayy...@gmail.com>:
>
>> Hi Akka gurus,
>>
>> 1. We use Akka in a production setup
>> 2. We use Cassandra as a back up for akka-persistence.
>> 3. One of the PersistentActors throwed NullPointerException during
>> startup.
>>
>> *The Akka libraries used :*
>>
>> "com.typesafe.akka" %% "akka-actor" % "2.4.17",
>> "com.typesafe.akka" %% "akka-slf4j" % "2.4.17",
>> "com.typesafe.akka" %% "akka-remote" % "2.4.17",
>> "com.typesafe.akka" %% "akka-cluster" % "2.4.17",
>> "com.typesafe.akka" %% "akka-cluster-sharding" % "2.4.17",
>> "com.typesafe.akka" %% "akka-persistence" % v,
>> "com.typesafe.akka" %% "akka-persistence-cassandra" % "0.23",
>> "com.typesafe.akka" %% "akka-http-core" % "10.0.1",
>> "com.typesafe.akka" %% "akka-stream" % "2.4.17",
>> "com.typesafe.akka" %% "akka-cluster-tools" % "2.4.17"
>>
>>
>> *The receive recover method of my Actor is as follows.*
>>
>>
>>
>> override def receiveRecover: Receive = {
>>
>> case SnapshotOffer(_, snapshot: DeviceActorReset) =>
>> isProcessing = false
>> task = null
>> context.become(receiveIdleCommand())
>>
>> case TaskParsed(parsedTask) =>
>> isProcessing = true
>> task = parsedTask
>> context.become(receiveValidateCommand())
>>
>> case TaskValidated => context.become(receiveProcessCommand)
>>
>> case RecoveryCompleted => {
>> logger.debug(s"Recovery completed successfully for device actor : ${
>> self.path.name}")
>> self ! Continue
>> }
>> }
>>
>>
>>
>> When one of the PersistentActors is started, we got
>> java.lang.NullPointerException
>>
>>
>> *The logs are as follows*
>>
>>
>> DEBUG [com.sam.sami.argus.tasks.PersistentDeviceActor]
>> (argus-akka.actor.default-dispatcher-5) 5643266d56c44415bc65ab7301ef938a
>> Starting a deviceActor
>> ERROR [akka.actor.OneForOneStrategy]
>> (argus-akka.actor.default-dispatcher-16) null
>> -java.lang.NullPointerException: null
>> : at
>> com.sam.sami.argus.tasks.PersistentDeviceActor$$anonfun$receiveProcessCommand$1.applyOrElse(PersistentDeviceActor.scala:183)
>> - at akka.actor.Actor$class.aroundReceive(Actor.scala:497)
>> - at
>> com.sam.sami.argus.tasks.PersistentDeviceActor.akka$persistence$Eventsourced$$super$aroundReceive(PersistentDeviceActor.scala:29)
>> - at
>> akka.persistence.Eventsourced$$anon$1.stateReceive(Eventsourced.scala:664)
>> - at
>> akka.persistence.Eventsourced$class.aroundReceive(Eventsourced.scala:183)
>> - at
>> com.sam.sami.argus.tasks.PersistentDeviceActor.aroundReceive(PersistentDeviceActor.scala:29)
>> - at akka.actor.ActorCell.receiveMessage(ActorCell.scala:526)
>> - at akka.actor.ActorCell.invoke(ActorCell.scala:495)
>> - at akka.dispatch.Mailbox.processMailbox(Mailbox.scala:257)
>> - at akka.dispatch.Mailbox.run(Mailbox.scala:224)
>> - at akka.dispatch.Mailbox.exec(Mailbox.scala:234)
>> - at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
>> - at
>> scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
>> - at
>> scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
>> - at
>> scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
>> DEBUG [com.sam.sami.argus.tasks.PersistentDeviceActor]
>> (argus-akka.actor.default-dispatcher-16) Snapshot recovery :
>> DeviceActorReset(5643266d56c44415bc65ab7301ef938a)
>> DEBUG [com.sam.sami.argus.tasks.PersistentDeviceActor]
>> (argus-akka.actor.default-dispatcher-5) Recovery completed successfully for
>> device actor : 5643266d56c44415bc65ab7301ef938a
>>
>>
>> *Actor behavior or States*
>>
>> We have the following different behavior aka states for this. (I want to
>> mention this because the state names are occurring in the above logs)
>>
>>
>> - receiveIdleCommand
>> - receiveValidateCommand
>> - receiveProcessCommand
>>
>> 5643266d56c44415bc65ab7301ef938a is just an ID we use to create actor names.
>>
>>
>> I am trying to understand what caused this.
>>
>>
>>
>> --
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--
>>>>>>>>>> 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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