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 <[email protected]>: > > 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 > > -- > >>>>>>>>>> Read the docs: http://akka.io/docs/ > >>>>>>>>>> Check the FAQ: > >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html > >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user > --- > You received this message because you are subscribed to the Google Groups > "Akka User List" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > To post to this group, send email to [email protected]. > Visit this group at http://groups.google.com/group/akka-user. > For more options, visit https://groups.google.com/d/optout. -- >>>>>>>>>> Read the docs: http://akka.io/docs/ >>>>>>>>>> Check the FAQ: >>>>>>>>>> http://doc.akka.io/docs/akka/current/additional/faq.html >>>>>>>>>> Search the archives: https://groups.google.com/group/akka-user --- You received this message because you are subscribed to the Google Groups "Akka User List" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/akka-user. For more options, visit https://groups.google.com/d/optout.
