Akka Streams HelloWorld example

In this section, we will develop our first Akka Streams simple and old-fashioned HelloWorld application. In this example, we will use or experiment with only two of the Akka Streams API components, as shown here:

Perform the following steps to experiment with this example:

1. Create a Scala SBT project in your favorite IDE:

      Project Name: akka-streams-scala-helloworld-app 

2. Add the akka-streams dependency in the build.sbt file:

build.sbt:

       name := "akka-streams-scala-helloworld-app"
       version := "1.0.0"
       scalaVersion := "2.12.2"
       libraryDependencies ++= Seq( 
         "com.typesafe.akka" %% "akka-stream" % "2.5.9"
       ) 

Here, we are using akka-stream "2.5.9", the latest stable version.

3. Create a AkkaStreams HelloWorld App with Source ~> Sink:

AkkaStreams_Source2Sink_HelloWorldApp.scala:

      package com.packt.publishing.akka.streams.hello 
 
      import akka.actor.ActorSystem 
      import akka.stream.ActorMaterializer 
      import akka...