Message not delivered log entry, after log entry of message having been delivered?

[que...@gmail.com]

I have one actor that sends a message to another actor. There is a message logged that the message is sent and a message logged that it was received, then later there is a message saying that the message could not be delivered. Is this normal?

Essentially, I have (java):

ActorRef actorB = system.actorOf(Props.create(ActorB.class), "actorb");
ActorRef actorA = system.actorOf(Props.create(ActorA.class, actorB), "actora");

actorA.tell(START, ActorRef.noSender());

ActorA's receive method:

ReceiveBuilder.matchEquals(START, ignored -> actorBRef.tell(START, self()))
                        .matchEquals(STOP, ignored -> context().system().terminate())
                        .build();

ActorB's receive method:

ReceiveBuilder.matchEquals(START, ignored -> {
                            // do stuff
                            sender().tell(STOP, self());
                            context().stop(self());
                         })
                        .build();

The log shows ActorA sent START to ActorB, ActorB received START and sent STOP to ActorA. Then later the dispatcher logs a message that ActorA's START message was not delivered to ActorB.

Is ActorB supposed to do something to indicate to the dispatcher that it received the message? I am guessing it has to do ActorB teliing itself to stop. Or, why is complaining about a message not being sent after it was sent and received?

[que...@gmail.com]

My guess is that this is normal. I changed my code so that it sends a message that it is done without stopping itself, then when it receives a message to stop itself it stops without also sending a message. So, there is no longer a message from the actor, in transit (maybe), while it is stopping itself.

I would still like to understand how the dispatcher saw a message as undelivered after it had been received.

[Patrik Nordwall]

You use noSender in ActorA when sending START. Use self instead.
/Patrik

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