CODEWITHSUNDEEP
scalarestakka-streamakka-http
Abhijit Sarkar
Abhijit Sarkar

Reputation: 24518

Akka HTTP ambiguous implicit conversion

I'm cutting my teeth on Akka HTTP by working this example. For the purposes of learning, I converted it to a Maven project. However, I'm getting compilation errors as follows using Akka v2.3.12 and Akka Stream v1.0. The POST DSL fails with similar errors that I'm not posting for brevity. How can I get the example to run?

pathPrefix("ip") {
(get & path(Segment)) { ip =>
  complete {
    fetchIpInfo(ip).map[ToResponseMarshallable] {
      case Right(ipInfo) => ipInfo
      case Left(errorMessage) => BadRequest -> errorMessage
    }
  }
}

[ERROR]  found   : akka.http.scaladsl.server.Directive[(String,)]
[ERROR]  required: ?{def apply: ?}
[ERROR] Note that implicit conversions are not applicable because they are ambiguous:
[ERROR]  both method addDirectiveApply in object Directive of type [L](directive: akka.http.scaladsl.server.Directive[L])(implicit hac: akka.http.scaladsl.server.util.ApplyConverter[L])hac.In => akka.http.scaladsl.server.Route
[ERROR]  and method fromDirective in object ConjunctionMagnet of type [L, R](other: akka.http.scaladsl.server.Directive[R])(implicit join: akka.http.scaladsl.server.util.TupleOps.Join[L,R])akka.http.scaladsl.server.ConjunctionMagnet[L]{type Out = akka.http.scaladsl.server.Directive[join.Out]}
[ERROR]  are possible conversion functions from akka.http.scaladsl.server.Directive[(String,)] to ?{def apply: ?}
[ERROR]         (get & path(Segment)) { ip =>

error: akka.http.scaladsl.server.Directive[(String,)] does not take parameters
[ERROR]         (get & path(Segment)) { ip =>

Upvotes: 1

Views: 761

Answers (1)

Abhijit Sarkar
Abhijit Sarkar

Reputation: 24518

Turns out this is due to the deep implicit chain that Spray (and hence akka-http) uses so getting the imports right is crucial. Very few examples show the imports and those that do, use old libraries.

Upvotes: 1

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