Java.lang.ClassNotFoundException: scala.Int when using akka 2.5.6 with sbt version 1.0.2

Question

I am trying to use akka -remoting version 2.5.4 with latest sbt 1.0.2

When I use sbt version 0.13.15 or 0.13.16, it works very well.

But when I use sbt verion 1.0.2 as here , I get below the error.

The exception below is the runtime exception.

[error] (run-main-0) java.lang.ClassNotFoundException: scala.Int [error] java.lang.ClassNotFoundException: scala.Int [error] at sbt.internal.inc.classpath.ClasspathFilter.loadClass(ClassLoaders.scala:74) [error] at java.lang.ClassLoader.loadClass(ClassLoader.java:357) [error] at java.lang.Class.forName0(Native Method) [error] at java.lang.Class.forName(Class.java:348) [error] at akka.actor.ReflectiveDynamicAccess.$anonfun$getClassFor$1(ReflectiveDynamicAccess.scala:21) [error] at scala.util.Try$.apply(Try.scala:209) [error] at akka.actor.ReflectiveDynamicAccess.getClassFor(ReflectiveDynamicAccess.scala:20) [error] at akka.serialization.Serialization.$anonfun$bindings$3(Serialization.scala:313) [error] at scala.collection.TraversableLike$WithFilter.$anonfun$map$2(TraversableLike.scala:739) [error] at scala.collection.immutable.HashMap$HashMap1.foreach(HashMap.scala:231) [error] at scala.collection.immutable.HashMap$HashTrieMap.foreach(HashMap.scala:462) [error] at scala.collection.TraversableLike$WithFilter.map(TraversableLike.scala:738) [error] at akka.serialization.Serialization.<init>(Serialization.scala:311) [error] at akka.serialization.SerializationExtension$.createExtension(SerializationExtension.scala:15) [error] at akka.serialization.SerializationExtension$.createExtension(SerializationExtension.scala:12) [error] at akka.actor.ActorSystemImpl.registerExtension(ActorSystem.scala:880) [error] at akka.actor.ExtensionId.apply(Extension.scala:77) [error] at akka.actor.ExtensionId.apply$(Extension.scala:77) [error] at akka.serialization.SerializationExtension$.apply(SerializationExtension.scala:12) [error] at akka.remote.RemoteActorRefProvider.init(RemoteActorRefProvider.scala:203) [error] at akka.actor.ActorSystemImpl.liftedTree2$1(ActorSystem.scala:796) [error] at akka.actor.ActorSystemImpl._start$lzycompute(ActorSystem.scala:793) [error] at akka.actor.ActorSystemImpl._start(ActorSystem.scala:793) [error] at akka.actor.ActorSystemImpl.start(ActorSystem.scala:809) [error] at akka.actor.ActorSystem$.apply(ActorSystem.scala:244) [error] at akka.actor.ActorSystem$.apply(ActorSystem.scala:287) [error] at akka.actor.ActorSystem$.apply(ActorSystem.scala:262) [error] at module09.remoteB.RemoteBStartup$.main(RemoteBStartup.scala:8) [error] at module09.remoteB.RemoteBStartup.main(RemoteBStartup.scala) [error] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [error] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) [error] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [error] at java.lang.reflect.Method.invoke(Method.java:498) [error] at sbt.Run.invokeMain(Run.scala:89) [error] at sbt.Run.run0(Run.scala:83) [error] at sbt.Run.execute$1(Run.scala:61) [error] at sbt.Run.$anonfun$run$4(Run.scala:73) [error] at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:12) [error] at sbt.util.InterfaceUtil$$anon$1.get(InterfaceUtil.scala:10) [error] at sbt.TrapExit$App.run(TrapExit.scala:252) [error] at java.lang.Thread.run(Thread.java:748) 

Github location here

For me, this seems like an error due to ConfigFactory.load , as there are some problems here due to the latest version of sbt.

Answer 1

It was a bug in sbt, so I filed it as such , and it was fixed in sbt version 1.1.0.

(If this turned out to be difficult to solve, we could consider implementing a workaround in Akka , but this turned out to be unnecessary)

Answer 2

Adding fork in run := true (which will fork the JVM to run the task) seems to solve the problem with sbt.

This workaround is indicated as the answer to the problem open by @Arnout