Hi John, There is no standard way to get hold of the ExtendedActorSystem outside of the ActorSystem, since it's not something that you should normally do.
Your serializer should get the extended actor system as an argument to its constructor. You can take a look at this Kryo serializer by romix. B/ On 1 November 2014 at 08:47:48, John Stephen ([email protected]) wrote: Hi Endre, Thank you for the reply. But my question is more - is there a standard way to obtain the reference for our extended actor system from outside the actor system ? You can determine the ActorRef from the actor system and the serialized actor path. We were trying to use the JavaSerializer form the Serialization extension to obtain the actor system but this does not work as the "currentSystem" property is thread local and is null for our customized serializer e.g. ActorRef ref = JavaSerializer.currentSystem().value().provider().resolveActorRef(identifier); We could try and provide this information via a static method but we were wondering if there is a standard way to provide this reference to the actor system to classes outside of the actor system ? Thanks John On Wednesday, 29 October 2014 10:25:27 UTC, Akka Team wrote: Hi John, The main problem with serializing ActorRefs directly is that they contain a unique identifier that identifies a current inhabitant of the corresponding actor path (see http://doc.akka.io/docs/akka/2.3.6/scala/actors.html#Actor_Lifecycle). Once the system is restarted and starts to replay the stored events the old UIDs will not match with the newly created actors. If you need to serialize references to certain actors you must serialize their path (ActorPath) and create an ActorSelection from them when you deserialize. Unfortunately you will need to resolve the ActorSelection with an Identify message to get the current ActorRef back, but there is no other way to do it. Of course this also relies on certain actors existing at a given path -- you might want to create them if they don't, but this depends on your use case. -Endre On Tue, Oct 28, 2014 at 4:48 PM, John Stephen <[email protected]> wrote: Hi, We are using Java, sharding and Akka persistence for our application We have decided to use json serialisation of our objects / classes to resolve sharding serialisation issues that we encountered in the cloud. We are now trying to get Akka persistence to work by storing the journal in DynamoDB. We are using Jackson to perform the json serialisation. The serialisation does not seem to be a problem. We can store it in DynamoDB as a string (so that we can view it manually). But we have hit a problem when deserialising / replaying the journal items. The classes have an actor reference that needs to be instantiated. We tried to get access to the ExtendedActorSystem by calling "JavaSerializer.currentSystem().value()" but this is returning a null pointer (see snippet of code below) ActorRef deserializedActorRef = JavaSerializer.currentSystem().value().provider().resolveActorRef(identifier); Does anybody know how to get access to the ExtendedActorSystem from a custom serialiser ? Or another way of resolving this problem ? Thanks John Notice: This email is confidential and may contain copyright material of members of the Ocado Group. Opinions and views expressed in this message may not necessarily reflect the opinions and views of the members of the Ocado Group. If you are not the intended recipient, please notify us immediately and delete all copies of this message. Please note that it is your responsibility to scan this message for viruses. 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