Implicit value issue for FromRequestUnmarshaller in akka-http with spray-json

[Arthur Kushka]

Hi. I was faced with a typical error with spray-json and akka-http that easy to find in Google, but none of solutions helps me.

Scala fail compiling in place where I parsing request body with `entity` directive. As error say, they can`t find implicit value for unmarshaller, but formatter and `SprayJsonSupport` are present in context (in documentation written that that`s enough).

Below is compiler message and my code.
Please help me with finding solution of this problem.

[error] /home/arhelmus/techmedia/akka-http/src/main/scala/utils/CustomDirectives.scala:31: could not find implicit value for parameter um: akka.http.unmarshalling.FromRequestUnmarshaller[utils.Credentials]
[error]     entity(as[Credentials]).flatMap { credentials =>

package utils

import akka.http.marshallers.sprayjson.SprayJsonSupport
import akka.http.server.Directive1
import models.User
import spray.json._

case class Credentials(login: String, password: String)

trait Protocols extends DefaultJsonProtocol {
  implicit val formatter: RootJsonFormat[Credentials] = jsonFormat2(Credentials.apply)
}

object CustomDirectives extends CustomDirectives

trait CustomDirectives extends SprayJsonSupport with Protocols {

  import akka.http.server.directives.BasicDirectives._
  import akka.http.server.directives.MarshallingDirectives._
  import akka.http.server.directives.ParameterDirectives._

  def authenticateByToken: Directive1[User] =
    parameter("token").flatMap { code =>
      provide(User(code, "asdsada", "asdsadasd"))
    }

  def authenticateByCredentials: Directive1[User] = {
    entity(as[Credentials]).flatMap { credentials =>
      provide(User(credentials.login, credentials.login, credentials.password))
    }
  }

}

[James Mulcahy]

I think you need an in-scope implicit FlowMaterializer (or perhaps an ActorFlowMaterializer, if you're on M3.  I think that may have been resolved in M4 though)

James

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[Paul Cleary]

Ugh, I hit this same issue using 1.0-M4; you still need an implicit `ActorFlowMaterializer` :(

[Kabir Idris]

Hi all, Im facing the same error in akka-http 1.0

[Heiko Seeberger]

Do you have an implicit Materializer in scope?

Heiko

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[Kabir Idris]

Yes I do have an implicit actor materializer  in scope

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[Heiko Seeberger]

Can you put the code up on GitHub or such? Else it’s pure speculation. 

Wrt speculation: Depending on what you are doing you might also need an implicit ExecutionContext.

Heiko

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On 23 Jul 2015, at 22:04, Kabir Idris <bink...@gmail.com> wrote:

Yes I do have an implicit actor materializer  in scope 

On Thu, 23 Jul 2015 6:54 pm Heiko Seeberger <loe...@posteo.de> wrote:

Do you have an implicit Materializer in scope?

Heiko

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On 23 Jul 2015, at 15:25, Kabir Idris <bink...@gmail.com> wrote:

Hi all, Im facing the same error in akka-http 1.0 



On Monday, March 16, 2015 at 12:16:37 AM UTC+1, Arthur Kushka wrote:

Hi. I was faced with a typical error with spray-json and akka-http that easy to find in Google, but none of solutions helps me.

Scala fail compiling in place where I parsing request body with `entity` directive. As error say, they can`t find implicit value for unmarshaller, but formatter and `SprayJsonSupport` are present in context (in documentation written that that`s enough).

Below is compiler message and my code.
Please help me with finding solution of this problem.

[error] /home/arhelmus/techmedia/akka-http/src/main/scala/utils/CustomDirectives.scala:31: could notfind implicit value for parameter um:akka.http.unmarshalling.FromRequestUnmarshaller[utils.Credentials]

[Johannes Rudolph]

I agree, this is more confusing than necessary. I created https://github.com/akka/akka/issues/18064 to improve the situation.

Johannes

[Kabir Idris]

Hi Heiko,
Here is my code

 implicit val system = ActorSystem()

    implicit val executor: ExecutionContext = system.dispatcher
    val log: LoggingAdapter = Logging(system, getClass)
    implicit val materializer = ActorMaterializer()


  Http().bindAndHandle(routes, httpInterface, httpPort)

On Monday, March 16, 2015 at 12:16:37 AM UTC+1, Arthur Kushka wrote:

[Harit Himanshu]

I have similar issue, how did you people resolve it?

[Heiko Seeberger]

You need to show the definition of routes. I assume (speculation again) that it’s a method in a different scope which doesn’t take an implicit Materializer (or EC).

Heiko

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[charles adetiloye]

@Heiko... please how did you solve it ?

[peter janovsky]

Charles, as Heiko pointed out you need to have an implicit Materializer in scope.  This resolved my compilation error