无法访问值 akka.http.javadsl.unmarshalling 中的类型 Unmarshaller
Could not access type Unmarshaller in value akka.http.javadsl.unmarshalling
我正在尝试使用 Akka Http Client API 编写一个简单的 Http 客户端。为此，我编写了以下代码
import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.unmarshalling._
import akka.stream.ActorMaterializer
import akka.stream.scaladsl.{Sink, Source}
import scala.concurrent.duration._
import scala.concurrent.{Await}
import akka.http.scaladsl.server.Directives
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport
import spray.json._
final case class Post(postId: Int, id: Int, name: String, email: String, body: String)
trait JsonSupport extends SprayJsonSupport with DefaultJsonProtocol {
implicit val postFormat = jsonFormat5(Post.apply)
}
class AkkaHttpClient extends App with Directives with JsonSupport {
implicit val system = ActorSystem("my-Actor")
implicit val actorMaterializer = ActorMaterializer()
implicit val executionContext = system.dispatcher
val httpClient = Http().outgoingConnection(host="http://jsonplaceholder.typicode.com/")
val flow = Source.single(HttpRequest(uri = Uri("/comments/1")))
.via(httpClient)
.mapAsync(1)(r => Unmarshal(r.entity).to[Post])
.runWith(Sink.head)
val results = Await.result(flow, 15 seconds)
println(results)
}
我的 build.sbt 文件看起来像
name := "Akka-Http-Client"
version := "1.0"
scalaVersion := "2.11.8"
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-http-experimental" % "2.4.9-RC1",
"com.typesafe.akka" %% "akka-http-spray-json-experimental" % "2.4.9-RC1"
)
当我尝试编译我的代码时出现这些错误
Error:scalac: missing or invalid dependency detected while loading class file 'Unmarshaller.class'.
Could not access type Unmarshaller in value akka.http.javadsl.unmarshalling,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'Unmarshaller.class' was compiled against an incompatible version of akka.http.javadsl.unmarshalling.
我在 2.4.9-RC1 上遇到了同样的问题，回到 2.4.8 解决了这个问题。
或者您可以使用此处描述的解决方法：https://github.com/akka/akka/issues/21105
我正在尝试使用 Akka Http Client API 编写一个简单的 Http 客户端。为此，我编写了以下代码
import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model._
import akka.http.scaladsl.unmarshalling._
import akka.stream.ActorMaterializer
import akka.stream.scaladsl.{Sink, Source}
import scala.concurrent.duration._
import scala.concurrent.{Await}
import akka.http.scaladsl.server.Directives
import akka.http.scaladsl.marshallers.sprayjson.SprayJsonSupport
import spray.json._
final case class Post(postId: Int, id: Int, name: String, email: String, body: String)
trait JsonSupport extends SprayJsonSupport with DefaultJsonProtocol {
implicit val postFormat = jsonFormat5(Post.apply)
}
class AkkaHttpClient extends App with Directives with JsonSupport {
implicit val system = ActorSystem("my-Actor")
implicit val actorMaterializer = ActorMaterializer()
implicit val executionContext = system.dispatcher
val httpClient = Http().outgoingConnection(host="http://jsonplaceholder.typicode.com/")
val flow = Source.single(HttpRequest(uri = Uri("/comments/1")))
.via(httpClient)
.mapAsync(1)(r => Unmarshal(r.entity).to[Post])
.runWith(Sink.head)
val results = Await.result(flow, 15 seconds)
println(results)
}
我的 build.sbt 文件看起来像
name := "Akka-Http-Client"
version := "1.0"
scalaVersion := "2.11.8"
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-http-experimental" % "2.4.9-RC1",
"com.typesafe.akka" %% "akka-http-spray-json-experimental" % "2.4.9-RC1"
)
当我尝试编译我的代码时出现这些错误
Error:scalac: missing or invalid dependency detected while loading class file 'Unmarshaller.class'.
Could not access type Unmarshaller in value akka.http.javadsl.unmarshalling,
because it (or its dependencies) are missing. Check your build definition for
missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.)
A full rebuild may help if 'Unmarshaller.class' was compiled against an incompatible version of akka.http.javadsl.unmarshalling.
我在 2.4.9-RC1 上遇到了同样的问题，回到 2.4.8 解决了这个问题。
或者您可以使用此处描述的解决方法：https://github.com/akka/akka/issues/21105