Akka ActorSystem创建问题 [英] Akka ActorSystem creation issue

问题描述

我们正在使用Akka 2.0 RC1，并在ActorSystem创建过程中获得异常消息，消息为： akka.actor.LocalActorRefProvider ，并且堆栈跟踪如下：

We are using Akka 2.0 RC1 and get an exception on ActorSystem creation with message: akka.actor.LocalActorRefProvider and stack trace as follows:

java.net.URLClassLoader$1.run(URLClassLoader.java:366)
java.net.URLClassLoader$1.run(URLClassLoader.java:355)
java.security.AccessController.doPrivileged(AccessController.java:279)
java.security.AccessController.doPrivileged(AccessController.java:520)
java.net.URLClassLoader.findClass(URLClassLoader.java:354)
java.lang.ClassLoader.loadClass(ClassLoader.java:450)
sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
java.lang.ClassLoader.loadClass(ClassLoader.java:385)
akka.actor.ReflectiveDynamicAccess.getClassFor(DynamicAccess.scala:94)
akka.actor.ReflectiveDynamicAccess.createInstanceFor(DynamicAccess.scala:102)
akka.actor.ActorSystemImpl.<init>(ActorSystem.scala:439)
akka.actor.ActorSystem$.apply(ActorSystem.scala:41)
akka.actor.ActorSystem$.apply(ActorSystem.scala:51)
kozo.excel.impl.ConnectClient.<init>(ConnectClient.scala:26)

此行上发生异常：

system = ActorSystem("FunctionClient")

有什么想法或想法吗？我们确实确认了LocalActorRefProvider在类路径中。

Any thoughts or ideas? We did confirm that LocalActorRefProvider was in classpath.

推荐答案

如果确实在问题中添加了实际的异常消息，那会有所帮助，但是我会在这里闲逛，并假设这是此错误消息，为在此线程中说明：

It would help if you did put the actual exception message in your question, but I will go on a limb here and assume this is this error message as illustrated in this thread:

java.lang.ClassCastException: interface akka.actor.ActorRefProvider is
not assignable from class akka.actor.LocalActorRefProvider 

运行正常当我以您描述的方式通过sbt在控制台下运行它时，对我也是如此。但是，如果我使用以下命令运行它：

It runs fine for me too when I run it under the console through sbt the way you describe. However, if I run it using:

scala -classpath

scala -classpath

并导入并执行，我确实得到了我提到的错误。

and import and execute, I do get the error I mentioned.

原因：

Akka使用创建 ActorSystem 的线程的上下文类加载器，并且由于每一行都是它自己的加载器，所以如果不使用它，就会遇到问题。

Akka uses the context class loader from the thread that created the ActorSystem, and since every line is on it's own loader, you'll have a problem if you don't use that.

建议：

每行

如果添加 -Yrepl-sync 选项，它应该可以正常工作

Each line in the repl runs in a separate thread.
If you add the -Yrepl-sync option it should work fine

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