extensions/struts2/example/root/WEB-INF/web.xml

<?xml version="1.0"?>
<!DOCTYPE web-app PUBLIC "-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
  "http://java.sun.com/dtd/web-app_2_3.dtd">

<web-app>

  <listener>
      <listener-class>com.google.inject.struts2.example.ExampleListener</listener-class>
  </listener>  

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

  <filter-mapping>
    <filter-name>guice</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>

</web-app>