Lagom DevMode does not work in 1.5.0.RC2 -ClassCastException

[ksuicmez]

Using Lagom 1.5.0.RC2 devmode getting following exception when accessing service

ava.lang.ClassCastException: class scala.runtime.Nothing$ is not assignable from class akka.discovery.SimpleServiceDiscovery
at akka.actor.ReflectiveDynamicAccess.$anonfun$getClassFor$1(ReflectiveDynamicAccess.scala:24)
at scala.util.Try$.apply(Try.scala:213)
at akka.actor.ReflectiveDynamicAccess.getClassFor(ReflectiveDynamicAccess.scala:21)
at akka.discovery.Discovery$.checkClassPathForOldDiscovery(Discovery.scala:111)
at akka.discovery.Discovery.(Discovery.scala:17)
at akka.discovery.Discovery$.createExtension(Discovery.scala:103)
at akka.discovery.Discovery$.createExtension(Discovery.scala:96)
at akka.actor.ActorSystemImpl.registerExtension(ActorSystem.scala:962)
at akka.actor.ExtensionId.apply(Extension.scala:79)
at akka.actor.ExtensionId.apply$(Extension.scala:78)
at akka.discovery.Discovery$.apply(Discovery.scala:97)
at com.lightbend.lagom.internal.registry.DevModeServiceDiscovery$.apply(DevModeServiceDiscovery.scala:43)
at com.lightbend.l

[octonato]

Lagom 1.5.0 is released and have been gone under different tests and experimentation and we never saw this issue. I have the impression that this can be related with some dirty build on your environment.

Can you update your app to Lagom 1.5.0, run an sbt clean and test it again?