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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