RoutingModule.scala

class RoutingModule extends ServletModule {
  override def configureServlets() = {
    filter("*").through(classOf[vistar.adserver.servlet.LoggingFilter])
    serve("/api/v1/get_ad/json").with(classOf[JsonAdRequestHandler])
    serve("/api/v1/get_ad/park/*").with(classOf[ParkMediaAdRequestHandler])
  }
}

ServletConfig.scala

package com.rightaction.servlet


class ServletConfig extends GuiceServletContextListener {
  private var injector: Injector = null

  override def getInjector = {
    Guice.createInjector(new ProductionModule(),
                         new InstrumentationModule(),
                         new RoutingModule())
  }

  // You get normal ServletContextListener methods here, so context created and
  // context destroyed stuff. You can hide .init() calls here for now
}

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns="http://java.sun.com/xml/ns/javaee"
	xmlns:web="http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd"
	version="2.4">

    <listener>
      <listener-class>com.rightaction.servlet.ServletConfig</listener-class>
    </listener>

    <filter>
      <filter-name>guiceFilter</filter-name>
      <filter-class>com.google.inject.servlet.GuiceFilter</filter-class>
    </filter>

    <filter-mapping>
      <filter-name>guiceFilter</filter-name>
      <url-pattern>/*</url-pattern>
    </filter-mapping>
</web-app>