Exception in thread "main" java.lang.NoSuchMethodError:

Question

I have a main object in akka.

object Application extends App {
  val system = ActorSystem()
  //...............
}

When I run it, it throws an exception of

Exception in thread "main" java.lang.NoSuchMethodError: akka.actor.ActorSystem.dispatcher()Lscala/concurrent/ExecutionContext;

How do I get rid of it?

I'm using akka 2.2.0

I think it's a problem with Akka 2.1. Are you on 2.1 or 2.2? — Harshal Pandya
– Harshal Pandya, Commented Jul 30, 2013 at 4:41
may be duplicated with [this][1], hope it helps [1]: stackoverflow.com/questions/17890223/… — Septem
– Septem, Commented Jul 30, 2013 at 6:19
Which version of scala are you using? Akka 2.2.0 should be run with scala 2.10.+. If you somehow are trying to run it with scala 2.9 (by example) you are bound to have those kinds of errors as scala.concurrent.ExecutionContext was only added in scala 2.10.0. — Régis Jean-Gilles
– Régis Jean-Gilles, Commented Jul 30, 2013 at 7:48

Régis Jean-Gilles · Accepted Answer · 2013-07-30 16:45:13Z

2

Now that you have updated your answer with your "build.sbt" file, it is rather clear what is happening: your application has "org.scalaj" % "scalaj-http_2.9.2" % "0.3.7" as a dependency. You are forcing the scala version for "scalaj", meaning that you will (transitively) get scala 2.9.2 pulled in your classpath, in addition to scala 2.10.2. To avoid this, do not force the scala version in your dependencies, but let sbt infer it from your project's scala version, by using the %% operator instead of % (just like you did for your other dependencies):

"org.scalaj" %% "scalaj-http" % "0.3.9"

Note that I have upgraded the library version to 0.3.9 as it is apparently the first version to be available for scala 2.10.

edited Jul 30, 2013 at 16:45

answered Jul 30, 2013 at 15:37

Régis Jean-Gilles

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1 Comment

Alan Coromano Over a year ago

I can't compile it due to the error of (*:update) sbt.ResolveException: download failed: junit#junit;4.10!junit.src

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