一个scala远程actor的例外

Question

我用这样的scala代码用于echo服务.

import scala.actors.Actor import scala.actors.Actor._ import scala.actors.remote.RemoteActor._

class Echo extends Actor {
   def act() {
        alive(9010)
        register('myName, self)

     loop {
       react {
            case msg  =>  println(msg)
       }
     }
   }
}
object EchoServer  {

   def main(args: Array[String]): unit = {
        val echo = new Echo
        echo.start
        println("Echo server started")
   }
} 
EchoServer.main(null)

但有一些例外.

java.lang.NoClassDefFoundError: Main$$anon$1$Echo$$anonfun$act$1
 at Main$$anon$1$Echo.act((virtual file):16)
 at scala.actors.Reaction.run(Reaction.scala:76)
 at scala.actors.Actor$$anonfun$start$1.apply(Actor.scala:785)
 at scala.actors.Actor$$anonfun$start$1.apply(Actor.scala:783)
 at scala.actors.FJTaskScheduler2$$anon$1.run(FJTaskScheduler2.scala:160)
 at scala.actors.FJTask$Wrap.run(Unknown Source)
 at scala.actors.FJTaskRunner.scanWhileIdling(Unknown Source)
 at scala.actors.FJTaskRunner.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: Main$$anon$1$Echo$$anonfun$act$1
 at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
 at java.security.AccessController.doPrivileged(Native Method)
 at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320)
 ... 8 more

我不知道怎么会导致它.顺便说一下.my scala版本是2.7.5