Akka-Http 2.4.9引发java.lang.NoClassDefFoundError:akka / actor / ActorRefFactory异常 [英] Akka-Http 2.4.9 throws java.lang.NoClassDefFoundError: akka/actor/ActorRefFactory exception
问题描述
我正在尝试使用Akka-http构建一个简单的Web服务。我遵循了此指南: http://doc.akka.io/docs/akka/2.4.9/scala/http/low-level-server-side-api.html ,当我运行sbt run时一切正常。 / p>
当我执行java -jar PROJECT.jar时,它会返回:
线程主中的异常java.lang.NoClassDefFoundError:Web服务器.main(WebServer.scala)上的akka / actor / ActorRefFactory
原因:java.lang.ClassNotFoundException:akka.actor.ActorRefFactory
在java.net.URLClassLoader.findClass(URLClassLoader.java:381)
在java.lang.ClassLoader.loadClass(ClassLoader.java:424)
在sun.misc.Launcher $ AppClassLoader.loadClass (Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
...还有1个
我的build.sbt:
name:= APPNAME
版本:= 0.0.1
标度aVersion:= 2.11.8
artifactName:= {(SV:ScalaVersion,模块:ModuleID,工件:Artifact)=>
artifact.name +- + module.revision +。 + artifact.extension
}
libraryDependencies ++ = Seq(
com.typesafe.akka %% akka-http-core% 2.4.9
)
我的主要对象:
导入akka.actor.ActorSystem
导入akka.http.scaladsl.Http
导入akka.http.scaladsl.model.HttpMethods._
import akka.http.scaladsl.model._
import akka.stream.ActorMaterializer
import scala.io.StdIn
object WebServer {
def main(args: Array [String]){
隐式val系统= ActorSystem( APPNAME)
隐式val实现器= ActorMaterializer()
隐式val executeContext = system.dispatcher
val requestHandler:HttpRequest => HttpResponse = {
case HttpRequest(GET,Uri.Path( /),_,_,_)=> {
HttpResponse(entity = HttpEntity(
ContentTypes.`text / html(UTF-8)`,
< html>< body> Hello world!< / body>< / html>)
)
}
case HttpRequest(GET,Uri.Path( / crash),_,_ ,_)=> {
sys.error( BOOM!)
}
case r:HttpRequest => {
r.discardEntityBytes()//重要的是要耗尽传入的HTTP实体流
HttpResponse(404,entity =未知资源!)
}
}
val bindingFuture = Http()。bindAndHandleSync(requestHandler, localhost,8080)
println(s服务器在线,位于http:// localhost:8080 / \n按RETURN停止。 ..)
StdIn.readLine()//让它运行直到用户按下返回键
bindingFuture
.flatMap(_。unbind())//触发从端口$ b $解除绑定b .onComplete(_ => system.terminate())//并在完成后关闭
}
}
我已经找到 java.lang.NoSuchMethodError:akka.actor.ActorCell.addFunctionRef 和 https://github.com/sbt/sbt-assembly/issues/204 但删除我的scala lib文件夹中的Akka-Actor并没有帮助。我还尝试了在与akka-http相同的版本中添加akka-actor作为依赖项。
Sbt使用Java本机应用程序打包用于打包scala项目。因此,您不必使用sbt程序集或创建胖子。
您可以尝试以下方法:
在项目根目录中:
sbt Universal:packageBin
运行:
./target/universal/stage/bin/ [项目名称]
I am trying to build a simple web service with Akka-http. I followed this guide: http://doc.akka.io/docs/akka/2.4.9/scala/http/low-level-server-side-api.html and everything works fine, when I run sbt run.
When I execute java -jar PROJECT.jar it returns:
Exception in thread "main" java.lang.NoClassDefFoundError: akka/actor/ActorRefFactory
at WebServer.main(WebServer.scala)
Caused by: java.lang.ClassNotFoundException: akka.actor.ActorRefFactory
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 1 more
My build.sbt:
name := "APPNAME"
version := "0.0.1"
scalaVersion := "2.11.8"
artifactName := { (sv: ScalaVersion, module: ModuleID, artifact: Artifact) =>
artifact.name + "-" + module.revision + "." + artifact.extension
}
libraryDependencies ++= Seq(
"com.typesafe.akka" %% "akka-http-core" % "2.4.9"
)
And my Main object:
import akka.actor.ActorSystem
import akka.http.scaladsl.Http
import akka.http.scaladsl.model.HttpMethods._
import akka.http.scaladsl.model._
import akka.stream.ActorMaterializer
import scala.io.StdIn
object WebServer {
def main(args: Array[String]) {
implicit val system = ActorSystem("APPNAME")
implicit val materializer = ActorMaterializer()
implicit val executionContext = system.dispatcher
val requestHandler: HttpRequest => HttpResponse = {
case HttpRequest(GET, Uri.Path("/"), _, _, _) => {
HttpResponse(entity = HttpEntity(
ContentTypes.`text/html(UTF-8)`,
"<html><body>Hello world!</body></html>")
)
}
case HttpRequest(GET, Uri.Path("/crash"), _, _, _) => {
sys.error("BOOM!")
}
case r: HttpRequest => {
r.discardEntityBytes() // important to drain incoming HTTP Entity stream
HttpResponse(404, entity = "Unknown resource!")
}
}
val bindingFuture = Http().bindAndHandleSync(requestHandler, "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
}
}
I already found java.lang.NoSuchMethodError: akka.actor.ActorCell.addFunctionRef and https://github.com/sbt/sbt-assembly/issues/204 but deleting the Akka-Actor in my scala lib folder hasn't helped. I also tried Adding akka-actor as dependency in the same version as akka-http.
Sbt is using java native app packging for packing scala projects. So you don't have to use sbt assembly or create a fat jar. You can try something along these lines:
In project root:
sbt universal:packageBin
run:
./target/universal/stage/bin/[project name]
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