Bootstrap Scalatra from ServletContextListener

Boostrap.scala

package org.scalatra.example

import org.scalatra._
import javax.servlet._
import javax.servlet.http._

class MyServlet(message: String) extends ScalatraServlet {
  get("/") { message }
}

class Bootstrap extends ServletContextListener {
  def contextDestroyed(ev: ServletContextEvent) = {}

  def contextInitialized(ev: ServletContextEvent) = {
    val ctx = ev.getServletContext
    val reg = ctx.addServlet("my-servlet", new MyServlet("constructor injected"))
    reg.addMapping("/*")
  }
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
  <listener>
    <listener-class>org.scalatra.example.Bootstrap</listener-class>
  </listener>
</web-app>