Scala Hello World

build.sbt

val AkkaVersion = "2.6.10"
val AkkaPersistenceCassandraVersion = "1.0.3"
val AkkaHttpVersion = "10.2.1"
val AkkaProjectionVersion = "1.0.0"

lazy val `akka-hello-world` = project
  .in(file("."))
  .settings(
    organization := "de.slesa.akka.samples",
    version := "0.1",
    scalaVersion := "2.13.3",
    scalacOptions in Compile ++= Seq("-deprecation", "-feature", "-unchecked", "-Xlog-reflective-calls", "-Xlint"),
    javacOptions in Compile ++= Seq("-Xlint:unchecked", "-Xlint:deprecation"),
    libraryDependencies ++= Seq(
      "com.typesafe.akka" %% "akka-slf4j" % AkkaVersion,
      "com.typesafe.akka" %% "akka-actor" % AkkaVersion
    )
 )

Main.scala

package hello_scala
import akka.actor.Actor
import akka.actor.ActorSystem
import akka.actor.Props

class HelloActor extends Actor {
  def receive = {
    case "hello" => println("hello back to you")
    case _ => println("huh?")
  }
}

object Main extends App {
  val system = ActorSystem("ReactiveEnterprise")
  val helloActor = system.actorOf(Props[hello_scala.HelloActor], name = "helloactor")
  helloActor ! "hello"
}