web.xml impacts

 <context-param>
    <param-name>guice-modules</param-name>
    <param-value>
      org.apache.shindig.common.PropertiesModule:
      org.apache.shindig.gadgets.DefaultGuiceModule:
      org.apache.shindig.social.core.config.SocialApiGuiceModule:
      org.apache.shindig.social.sample.SampleModule:
      org.apache.shindig.gadgets.oauth.OAuthModule:

      <!-- Start OAuth2 Modules -->
      org.apache.shindig.gadgets.oauth2.OAuth2Module:
      org.apache.shindig.gadgets.oauth2.sample.OAuth2MessageModule:
      org.apache.shindig.gadgets.oauth2.handler.sample.OAuth2HandlerModule:
      org.apache.shindig.gadgets.oauth2.persistence.sample.OAuth2PersistenceModule:     
      <!-- End OAuth2 Modules -->

      org.apache.shindig.common.cache.ehcache.EhCacheModule:
      org.apache.shindig.sample.shiro.ShiroGuiceModule:
      org.apache.shindig.sample.container.SampleContainerGuiceModule:
      org.apache.shindig.extras.ShindigExtrasGuiceModule
    </param-value>
  </context-param>


<!-- OAuth2 callback -->
  <servlet>
    <servlet-name>oauth2callback</servlet-name>
    <servlet-class>
      org.apache.shindig.gadgets.servlet.OAuth2CallbackServlet
    </servlet-class>
  </servlet>