java.lang.nosuchmethoderror：＆＃x27; voidakka.actor.extensionId。$ init $（akka.actor.extensionid）＆＃x27;

Question

我只是尝试使用Akka在Scala项目中实现一个少量的示例休息端点。 该代码看起来如下

import akka.http.scaladsl.Http
import akka.http.scaladsl.model.{ContentTypes, HttpEntity}

import akka.actor.typed.ActorSystem
import akka.actor.typed.scaladsl.Behaviors
import scala.io.StdIn

import scala.concurrent.ExecutionContextExecutor


object ViewAPI :
  @main def run(): Unit = {
    implicit val system = ActorSystem(Behaviors.empty, "my-system")
    implicit val executionContext = system.executionContext
    val route =
      path("hello") {
        get {
          complete(HttpEntity(ContentTypes.`text/html(UTF-8)`, "<h1>Say hello to akka-http</h1>"))
        }
      }
    val bindingFuture = Http().newServerAt("localhost", 9001).bind(route)

  }

：我的SBT文件的外观如下：

libraryDependencies += ("com.typesafe.akka" %% "akka-http" % "10.2.9").cross(CrossVersion.for3Use2_13)

libraryDependencies += "com.typesafe.akka" %% "akka-actor-typed" % "2.6.19"

libraryDependencies += "com.typesafe.akka" %% "akka-stream" % "2.6.19"

libraryDependencies += "org.scalactic" %% "scalactic" % "3.2.11"

libraryDependencies += "org.scalatest" %% "scalatest" % "3.2.12-RC1" % "test"

libraryDependencies += "org.scala-lang.modules" %% "scala-swing" % "3.0.0"

libraryDependencies += "com.google.inject" % "guice" % "4.2.3"

libraryDependencies += ("net.codingwell" %% "scala-guice" % "5.0.2").cross(CrossVersion.for3Use2_13)

libraryDependencies += "com.typesafe.play" %% "play-json" % "2.10.0-RC5"

libraryDependencies += "org.scala-lang.modules" %% "scala-xml" % "2.0.1"

resolvers += Resolver.url("scoverage-bintray", url("https://dl.bintray.com/sksamuel/sbt-plugins/"))(Resolver.ivyStylePatterns)

这些是项目中的库

sbt: com.typesafe.akka:akka-actor-typed_3:2.6.19:jar
sbt: com.typesafe.akka:akka-actor_3:2.6.19:jar
sbt: com.typesafe.akka:akka-http-core_2.13:10.2.9:jar
sbt: com.typesafe.akka:akka-http_2.13:10.2.9:jar
sbt: com.typesafe.akka:akka-parsing_2.13:10.2.9:jar
sbt: com.typesafe.akka:akka-protobuf-v3_3:2.6.19:jar
sbt: com.typesafe.akka:akka-slf4j_3:2.6.19:jar
sbt: com.typesafe.akka:akka-stream_3:2.6.19:jar

时，试图执行上述代码时，抛出了以下例外：

Exception in thread "main" java.lang.NoSuchMethodError: 'void akka.actor.ExtensionId.$init$(akka.actor.ExtensionId)'
    at akka.http.scaladsl.Http$.<clinit>(Http.scala:845)
    at caro.aview.ViewAPI$.run(ViewAPI.scala:23)
    at caro.aview.run.main(ViewAPI.scala:14)

是否有人知道为什么是？任何帮助将不胜感激，谢谢！

Answer 1

我也有这个问题。该解决方案是使用Crossversion将所有Akka库返回到Scala 2.13.for3use2_13选项，与您用于Akka-HTTP相同的选项。对于Scala 3版本的AKKA中，看起来像是一个错误。

Answer 2

在我的项目中，我遇到了同样的错误。我在一个AKKA软件包中使用了2.13 Scala版本，在pom.xml中使用了另一个AKKA软件包的Scala版本。更改为使用3，并修复了错误。