spray-json error: could not find implicit value for parameter um
akka, implicit-conversion, scala, spray
Solution
Spray's 'entity[E]' directive requires implicit marshaller in its scope for the type E. `JsonImplicits` object creates json marshaller and unmarshaller for the type E.
You need to make sure that `implicit val impPerson` is in the scope, in other words put `import JsonImplicits._` above the route definition.
Problem
I have this case class ``` case class Person(val name: String) object JsonImplicits extends DefaultJsonProtocol { implicit val impPerson = jsonFormat1(Person) } ``` I'm trying spray-json in order to parse post request: ``` post { entity(as[Person]) { person => complete(person) } } ``` However I get when I try to compile this: src/main/scala/com/example/ServiceActor.scala:61: error: could not find implicit value for parameter um: spray.httpx.unmarshalling.FromRequestUnmarshaller[com.example.Person] I don't understand what's happening, how can I fix this to be working? thanks