AWS Lambda Microservice — Scala

build.sbt

javacOptions ++= Seq("-source", "1.8", "-target", "1.8", "-Xlint")

lazy val root = (project in file(".")).
  settings(
    name := "lambda-demo",
    version := "1.0",
    scalaVersion := "2.11.4",
    retrieveManaged := true,
    libraryDependencies += "com.amazonaws" % "aws-lambda-java-core" % "1.0.0",
    libraryDependencies += "com.amazonaws" % "aws-lambda-java-events" % "1.0.0",
  )

mergeStrategy in assembly := {
  case PathList("META-INF", xs @ _*) => MergeStrategy.discard
  case x => MergeStrategy.first
}

main.scala

package blahblah;

import scala.collection.JavaConverters._
import java.net.URLDecoder

import com.amazonaws.services.lambda.runtime.Context

import java.io.{InputStream, OutputStream, PrintStream}

class Main {
  def api(input: InputStream, output: OutputStream, context:Context): Unit = {
    val logger = context.getLogger()
    logger.log("Hi")
    // oh yeah, you can do this too, thanks to that PrintStream import
    System.out.println("WHAT")
    System.err.println("WHO?")
      
    output.write("HELLO WORLD".getBytes("UTF-8"))
  }

  // another option for the following is to do this,
  // HOWEVER, i havent tried this yet
  // see this if you think this looks interesting http://docs.aws.amazon.com/lambda/latest/dg/java-handler-using-predefined-interfaces.html
  // and i havent looked at the scala equivalent to the following ...
  // public class Hello implements RequestHandler<Request, Response>
  /*
    import com.amazonaws.services.lambda.runtime.RequestHandler;

    def api(request: Request, context: Context):Response {
      val response = new Response("Hello World")
    }
  */
}

Just enough Scala to build an AWS Lambda based Microservice
also note the reference to logger, see this for more http://docs.aws.amazon.com/lambda/latest/dg/java-context-object.html
you should probably read this too http://docs.aws.amazon.com/lambda/latest/dg/java-lambda.html
and maybe this https://aws.amazon.com/blogs/compute/writing-aws-lambda-functions-in-scala/
and maybe even take a look at snowplow http://snowplowanalytics.com/blog/2015/08/20/aws-lambda-scala-example-project-0.1.0-released/