Scala Akka-验证安装

我已安装Akka，需要验证安装是否成功。我只是用

akka -version

但这是一个错误。原因是什么？akka不支持-版本吗？ 这就是它正在报告的错误

Starting Akka...
Running Akka 2.2.4
Exception in thread "main" java.lang.ClassNotFoundException: -version
    at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
    at akka.kernel.Main$$anonfun$1.apply(Main.scala:82)
    at akka.kernel.Main$$anonfun$1.apply(Main.scala:82)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.TraversableLike$$anonfun$map$1.apply(TraversableLike.scala:244)
    at scala.collection.Iterator$class.foreach(Iterator.scala:727)
    at scala.collection.AbstractIterator.foreach(Iterator.scala:1157)
    at scala.collection.IterableLike$class.foreach(IterableLike.scala:72)
    at scala.collection.AbstractIterable.foreach(Iterable.scala:54)
    at scala.collection.TraversableLike$class.map(TraversableLike.scala:244)
    at scala.collection.AbstractTraversable.map(Traversable.scala:105)
    at akka.kernel.Main$.main(Main.scala:82)
    at akka.kernel.Main.main(Main.scala)

---

Akka不支持

-version

命令。正如Akka所建议的那样，一种确定您的安装工程是否运行简单程序的方法是：

>  akka
No boot classes specified
Usage: bin/akka org.somewhere.BootClass