我想将 spray.io 与 scala 2.11.x akka 2.3.x 一起使用,我在 spray.io 的项目信息页面中找到以下内容:
spray 1.3.1 is built against Scala 2.10.3 and Akka 2.3.0 as well as Scala 2.11.1 and Akka 2.3.2.
当我使用 spray-client 时,我遇到了一些问题,然后我在 spray.io 的文档页面中发现,spray-client 依赖于 akka 2.10.x:
akka-actor 2.2.x (with ‘provided’ scope, i.e. you need to pull it in yourself)
提供的范围是什么意思?如何将它与用 scala 2.11.x akka 2.3.x 编写的程序的其他部分一起使用?
编辑
以下是文档页面中列出的最简单的用例:
import akka.actor.ActorSystem
import scala.concurrent.Future
object main {
def main(args: Array[String]) {
import spray.http._
import spray.client.pipelining._
implicit val system = ActorSystem()
import system.dispatcher // execution context for futures
val pipeline: HttpRequest => Future[HttpResponse] = sendReceive
val response: Future[HttpResponse] = pipeline(Get("http://spray.io/"))
}
}
使用 build.sbt:
scalaVersion := "2.11.1"
libraryDependencies += "com.typesafe.akka" %% "akka-actor" % "2.3.2"
libraryDependencies += "io.spray" % "spray-client" % "1.3.1"
虽然这编译得很好,但它遇到了运行时错误:
Uncaught error from thread [default-akka.actor.default-dispatcher-2] shutting down JVM since 'akka.jvm-exit-on-fatal-error' is enabled for ActorSystem[default]
java.lang.NoClassDefFoundError: scala/runtime/AbstractPartialFunction$mcVL$sp
at ...