The Future is not complete?

Question

object Executor extends App {
  implicit val system = ActorSystem()
  implicit val materializer = ActorMaterializer()
  implicit val ec = system.dispatcher
  import          


        

Answer 1

Coincidently I created almost the same app for testing/playing with Akka Streams. Could the imported implicits cause the problem? This app works fine for me:

object PrintAllInFile extends App {
  val file = new java.io.File("data.txt")

  implicit val system = ActorSystem("test")
  implicit val mat    = ActorMaterializer()
  implicit val ec     = system.dispatcher

  SynchronousFileSource(file)
    .to(Sink.outputStream(() => System.out))
    .run()
    .onComplete(_ => system.shutdown())
}

Note the stopping of the ActorSystem in the 'onComplete'. Otherwise the app will not exit.