How to run a Tcp server in the background

TcpServerApp.scala

import java.net.InetSocketAddress
import scalaz.concurrent.Task
import scalaz.stream.tcp
import java.util.concurrent.Executors

object TcpServerApp extends App {

  val executor  = Executors.newSingleThreadExecutor
  implicit val S = scalaz.concurrent.Strategy.DefaultStrategy
  implicit val AG = tcp.DefaultAsynchronousChannelGroup
  val address = new InetSocketAddress("localhost", 9999)

  val pipeline = tcp.reads(1024).map(bv => println(s"Received a ByteVector of size: ${bv.size}"))
  val server = tcp.server(address, concurrentRequests = 2)(pipeline).runLast.run.getOrElse(sys.error("Plop")).run

  Task.fork(server)(executor).runAsync(println)

}