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Let's first download the jetty runner:

wget http://central.maven.org/maven2/org/eclipse/jetty/jetty-runner/9.4.0.M0/jetty-runner-9.4.0.M0.jar

Then create a Scala file, server.scala, that creates a AbstractHandler class, which handles incoming request, and outputs some text.

import org.eclipse.jetty.server.handler.AbstractHandler
import org.eclipse.jetty.server.{Server, Request}
import javax.servlet.http.{HttpServletRequest, HttpServletResponse}

class Handler extends AbstractHandler {
  var html = <h1>Something, innit</h1>

  override def handle(target: String,
                      req: Request,
                      httpReq: HttpServletRequest,
                      httpRes: HttpServletResponse) = {
    httpRes.setContentType("text/html")
    httpRes.setStatus(HttpServletResponse.SC_OK)
    httpRes.getWriter().println(html.toString)
    req.setHandled(true)
  }
}

val server = new Server(8080)
server.setHandler(new Handler)
server.start

Finally run the Scala program.

scala -cp jetty-runner-9.4.0.M0.jar server.scala

You can now visit http://localhost:8080 to reach it. It'll take about 15 seconds to load.