java.lang.ClassNotFoundException: akka.actor.MissingExtension

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You need to add httpcore to your dependencies. Try adding version 4.3 or further.

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A few things cause this exception:
1) Check if you have all jars and if they're in the correct path.
2) Your classpath might be broken, you can define it in the command line with java -cp yourClassPath or at your IDE if you're using one.

Solutions on the web

via GitHub by chris-martin
, 1 year ago
akka.actor.MissingExtension
java.lang.ClassNotFoundException: akka.actor.MissingExtension
at java.lang.ClassLoader.findClass(ClassLoader.java:530)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sbt.classpath.ClasspathFilter.loadClass(ClassLoaders.scala:59)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at akka.actor.ReflectiveDynamicAccess$$anonfun$getClassFor$1.apply(ReflectiveDynamicAccess.scala:21)
at scala.util.Try$.apply(Try.scala:192)
at akka.actor.ReflectiveDynamicAccess.getClassFor(ReflectiveDynamicAccess.scala:20)
at akka.actor.ReflectiveDynamicAccess.createInstanceFor(ReflectiveDynamicAccess.scala:38)
at akka.actor.ActorSystemImpl$$anonfun$loadExtensions$1$1$$anonfun$1.applyOrElse(ActorSystem.scala:769)

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