title: Stable Classloader for Akka testing in SBT
body: <p>When launching sbt in interactive mode, running the test task once succeeds but the second time it fails with a class loading exception.</p>
  
  <p>The Akka team suggests that I should initialize my ActorSystem with a stable classloader.  </p>
  
  <p>What's the right classloader to use and how can I retrieve it in my tests?</p>