Re: [akka-user] Akka Stream - ExecutionException: Boxed Error

[Patrik Nordwall]

Could you also try

val done = source.runWith(sink)

done.onComplete ....

You use version 0.11, right?

What is the full stackTrace?

Try to grab the getCause of the ExecutionException.

/Patrik

28 nov 2014 kl. 15:25 skrev Bertil Chapuis <bcha...@agimem.com>:

Hi,

I'm playing with Akka Stream and trying to define a Source that listen to file system events with the java nio WatchService.

import java.nio.file.StandardWatchEventKinds._

import java.nio.file._

import akka.actor.ActorSystem

import akka.stream.FlowMaterializer

import akka.stream.scaladsl._

import scala.util.{Failure, Success}

object Main extends App {

  implicit val system = ActorSystem()

  import system.dispatcher

  implicit val materializer = FlowMaterializer()

  val dir = Paths.get("/tmp")

  val watcher = FileSystems.getDefault().newWatchService()

  dir.register(watcher, ENTRY_CREATE, ENTRY_DELETE, ENTRY_MODIFY)

  val source = Source(() => Some(watcher.poll())).filter(key => key != null)

  val sink = ForeachSink[WatchKey](key => {

    println(key)

    Thread.sleep(1000)

  })

  val materialized = FlowGraph { implicit builder =>

    import akka.stream.scaladsl.FlowGraphImplicits._

    source ~> sink

  }.run()

  materialized.get(sink).onComplete {

    case Success(_) =>

      system.shutdown()

    case Failure(e) =>

      println(e)

      system.shutdown()

  }

}

When I try to filter the source to exclude null watch keys, I get the following exception:

java.util.concurrent.ExecutionException: Boxed Error

Any ideas regarding this problem?

Regards,

Bertil

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