Jetty embarcado com scala e serviço de rest. outros exemplos de Jetty embarcado http://wiki.eclipse.org/Jetty/Tutorial/Embedding_Jetty#Setting_a_Web_Application_Context

Boot.scala

package com.softsimples.social

import filter.SecurityFilter
import org.eclipse.jetty.server.{Server, Handler}
import org.eclipse.jetty.server.handler.{HandlerList, ResourceHandler}
import org.eclipse.jetty.servlet.{ServletHolder, ServletContextHandler}
import servlet.{WebSocketHandlerServlet, SocialCollectorHandler}
import com.sun.jersey.spi.container.servlet.ServletContainer

object Boot {

  def main(args: Array[String]) {
    val context = buildContext()
    val resource_handler = buildResourceHandler()
    buildServlets(context)
    val handlers = buildHandlerList(context, resource_handler)
    startServer(handlers)
  }

  def startServer(handlers:HandlerList) = {
    val server = new Server(8080)
    server.setHandler(handlers)
    server.start
    server.join
  }

  def buildContext(): ServletContextHandler = {
    val context = new ServletContextHandler(ServletContextHandler.SESSIONS)
    context.setContextPath("/")
    context
  }

  def buildServlets(context:ServletContextHandler) = {
    val jerseyServletHolder:ServletHolder  = new ServletHolder(new ServletContainer);
    jerseyServletHolder.setInitParameter("com.sun.jersey.config.property.resourceConfigClass", "com.sun.jersey.api.core.PackagesResourceConfig");
    jerseyServletHolder.setInitParameter("com.sun.jersey.config.property.packages", "com.softsimples.social.controllers");

    //context.addFilter(classOf[SecurityFilter], "/actions/*", 1);
    context.addServlet(jerseyServletHolder, "/actions/*")
    context.addServlet(new ServletHolder(new SocialCollectorHandler), "/socialCollector/*")
    context.addServlet(new ServletHolder(new WebSocketHandlerServlet), "/ws/*")
  }

  def buildResourceHandler(): ResourceHandler = {
    val resource_handler = new ResourceHandler
    resource_handler.setDirectoriesListed(true)
    resource_handler.setWelcomeFiles(Array[String]("index.html"))
    resource_handler.setResourceBase(".")
    resource_handler
  }

  def buildHandlerList(context:ServletContextHandler, resource_handler:ResourceHandler): HandlerList = {
    val handlers = new HandlerList
    handlers.setHandlers(Array[Handler](context, resource_handler))
    handlers
  }
}