De/Serializing LocalDateTime with akka-http - scala

Question

I am trying to add support for serializing and deserializing LocalDateTime in akka-http. I'm a little confused by the following error:
Error:(42, 20) could not find implicit value for parameter um:
akka.http.scaladsl.unmarshalling.FromRequestUnmarshaller[SomeData]
entity(as[SomeData]) { evt => complete(StatusCodes.Created) }
Error:(42, 20) not enough arguments for method as: (implicit um:
akka.http.scaladsl.unmarshalling.FromRequestUnmarshaller[SomeData])akka.http.scaladsl.unmarshalling.FromRequestUnmarshaller[SomeData].
Unspecified value parameter um.
entity(as[SomeData]) { evt => complete(StatusCodes.Created) }
What an I missing in the following code? I pasted my code into the minimalist sample from the Akka-http documentation. I am running Akka-http 10.0.6.
import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.server.Directives._
import akka.stream.ActorMaterializer
import scala.io.StdIn
import java.time.LocalDateTime
import java.time.format.DateTimeFormatter
import spray.json.{DefaultJsonProtocol, JsString, JsValue, JsonFormat}
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport
import akka.http.scaladsl.server.Route
final case class SomeData (dateTime: LocalDateTime)
trait JsonSupport extends SprayJsonSupport with DefaultJsonProtocol {
implicit val eventDataFormat: JsonFormat[SomeData] = jsonFormat1(SomeData)
implicit val localDateTimeFormat = new JsonFormat[LocalDateTime] {
private val iso_date_time = DateTimeFormatter.ISO_DATE_TIME
def write(x: LocalDateTime) = JsString(iso_date_time.format(x))
def read(value: JsValue) = value match {
case JsString(x) => LocalDateTime.parse(x, iso_date_time)
case x => throw new RuntimeException(s"Unexpected type ${x.getClass.getName} when trying to parse LocalDateTime")
}
}
// implicit val eventDataFormat: JsonFormat[SomeData] = jsonFormat1(SomeData) ** moved here **
}
object Main extends JsonSupport {
def main(args: Array[String]): Unit = {
implicit val system = ActorSystem("my-system")
implicit val materializer = ActorMaterializer()
implicit val executionContext = system.dispatcher
val route:Route =
path("hello") {
post {
entity(as[SomeData]) { evt => complete(StatusCodes.Created) }
}
}
val bindingFuture = Http().bindAndHandle(route, "localhost", 8080)
println(s"Server online at http://localhost:8080/\nPress RETURN to stop...")
StdIn.readLine() // let it run until user presses return
bindingFuture
.flatMap(_.unbind()) // trigger unbinding from the port
.onComplete(_ => system.terminate()) // and shutdown when done
}
}

Answer 1

implicit val eventDataFormat: JsonFormat[SomeData] = jsonFormat1(SomeData)
↓
implicit val eventDataFormat = jsonFormat1(SomeData)