I'm building a library that is going to be used by 3rd-party. In one of my 
methods I return Stream[Item] that is asynchronously generated from result 
of paginated REST API call.


I'm using my modification of BulkPullerAsync 
<https://github.com/MfgLabs/akka-stream-extensions/blob/master/commons/src/main/scala/internals/source/BulkPullerAsync.scala>.
 
My code is here <https://gist.github.com/cppexpert/a366bf3fbd34b53b2e4c>.


I want recipient of my stream to be able to handle errors. According to 
documentation 
<http://doc.akka.io/docs/akka-stream-and-http-experimental/1.0/scala/stream-error.html>
 I'm 
supposed to use custom Supervision.Decider.


val decider: Supervision.Decider = {
  case ex =>
    ex.printStackTrace()
    Supervision.Stop}
implicit val mat = 
ActorMaterializer(ActorMaterializerSettings(system).withSupervisionStrategy(decider))


Unfortunately it doesn't catch exceptions thrown in my ActionPublisher. I 
see it handled, ActorPublisher.onError is called but it doesn't reach 
Supervision.Decider. It works with simple Stream provided in documentation.

What should I do ? I expect that users of my Stream should not depend on 
nature of its implementation.


Thanks!

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