Type mismatch, expected: ToResponseMarshallable, actual: WebServer.Item

[Ajinkya Shukla]

The following example at http://doc.akka.io/docs/akka/2.4/scala/http/common/json-support.html gives an error at line no. 43 and 44.

Error:(43, 41) type mismatch;

 found   : WebServer.Item

 required: akka.http.scaladsl.marshalling.ToResponseMarshallable

            case Some(item) => complete(item)

1.  import akka.actor.ActorSystem
2.    import akka.http.scaladsl.Http
3.    import akka.stream.ActorMaterializer
4.    import akka.Done
5.    import akka.http.scaladsl.server.Route
6.    import akka.http.scaladsl.server.Directives._
7.    import akka.http.scaladsl.model.StatusCodes
8.    import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport._
9.    import spray.json.DefaultJsonProtocol._
11.     import scala.io.StdIn
13.     import scala.concurrent.Future
15.     object WebServer {
17.       // domain model
18.      final case class Item(name: String, id: Long)
19.      final case class Order(items: List[Item])
21.       // formats for unmarshalling and marshalling
22.      implicit val itemFormat = jsonFormat2(Item)
23.      implicit val orderFormat = jsonFormat1(Order)
25.       // (fake) async database query api
26.      def fetchItem(itemId: Long): Future[Option[Item]] = ???
27.      def saveOrder(order: Order): Future[Done] = ???
29.       def main(args: Array[String]) {
31.         // needed to run the route
32.        implicit val system = ActorSystem()
33.        implicit val materializer = ActorMaterializer()
34.        // needed for the future map/flatmap in the end
35.        implicit val executionContext = system.dispatcher
37.         val route: Route =
38.          get {
39.            pathPrefix("item" / LongNumber) { id =>
40.              // there might be no item for a given id
41.              val maybeItem: Future[Option[Item]] = fetchItem(id)
43.               onSuccess(maybeItem) {
44.                case Some(item) => complete(item)
45.           case None       => complete(StatusCodes.NotFound)
46.              }
47.            }
48.          } ~
49.            post {
50.              path("create-order") {
51.                entity(as[Order]) { order =>
52.                  val saved: Future[Done] = saveOrder(order)
53.                  onComplete(saved) { done =>
54.                    complete("order created")
55.                  }
56.                }
57.              }
58.            }
60.         val bindingFuture = Http().bindAndHandle(route, "localhost", 8080)
61.        println(s"Server online at http://localhost:8080/\nPress RETURN to stop...")
62.        StdIn.readLine() // let it run until user presses return
63.        bindingFuture
64.          .flatMap(_.unbind()) // trigger unbinding from the port
65.          .onComplete(_ ⇒ system.terminate()) // and shutdown when done
67.       }
68.    }
69.  }

How can I pass argument of type ToResponseMarshallable to complete method ?

[Akka Team]

Hi Ajinkya,

The sample works copied verbatim from your mail. Additionally the example sources you copied it from is part of our Akka build and does indeed also compile.

Something must be wrong with your local environment, have you added the akka-http-spray-experimental module as a dependency?

--

Johan

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