akka-http error: could not find implicit value for parameter um: akka.http.scaladsl.unmarshalling.FromRequestUnmarshaller

Question

I know that has been asked already, but I can't seem to find an answer. Here is my code :

import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport
import spray.json.DefaultJsonProtocol

final case class Client(clientId:Int, clientName:String, platformIds:Int, host:String, password:String)

object ClientJson extends DefaultJsonProtocol with SprayJsonSupport {
    implicit val clientFormat = jsonFormat5(Client)
}

class HTTPListenerActor extends Actor with ImplicitMaterializer with RoadMap {

implicit val conf = context.system.settings.config
implicit val system = context.system
implicit val ec = context.dispatcher


Await.result(Http().bindAndHandle(roads, "interface", 8080), Duration.Inf)

override def receive:Receive = Actor.emptyBehavior
}

trait RoadMap extends Directives  {

val roads: Route = path("client"/IntNumber) { id =>
    import ClientJson._
    post {
        entity(as[Client]) { c => complete {c} }
    }
  }
}

This code generates error

 [ant:scalac] /Users/smalov/Workspace/api-service/src/main/scala/com/acheron/HTTPListenerActor.scala:51: error: could not find implicit value for parameter um: akka.http.scaladsl.unmarshalling.FromRequestUnmarshaller[com.acheron.Client]
 [ant:scalac]           entity(as[Client]) { c =>

Now the most common cause for this kind of error is forgetting to import marshalling implicit into the scope near the roads definition, however, I did not forget this. Another reason could be that I have implicit FlowMaterializer in scope instead of ActorMaterializer, but ImplictMaterializer trait takes care of this.

Anything else I could be missing ?

I'm using Scala 2.11.7, Akka 2.3.11, akka-http 1.0, spray-json 1.3.2

Answer 1

I too got the same error and it resolved after importing

import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport._

May be this will help