Posted on by Vinny Panne

Mapping Servlets To App Engine XMPP Requests

Here’s an example of how to configure servlets to accept XMPP requests. The XML below should be added to the web.xml file in the /war/WEB-INF directory.

This XML snippet configures three servlets: ChatServlet (handles inbound XMPP chat messages), PresenceServlet (handles requests for the application’s presence information, and presence info for other clients) and SubscribeServlet (when other XMPP users grant the application access to their presence information).

<!-- Handles the chat part of XMPP. -->
<servlet>
    <servlet-name>Chat</servlet-name>
    <servlet-class>com.example.xmpp.ChatServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>Chat</servlet-name>
    <url-pattern>/_ah/xmpp/message/chat/</url-pattern>
</servlet-mapping>
<!-- Handles the presence part of XMPP. -->
<servlet>
    <servlet-name>Presence</servlet-name>
    <servlet-class>com.example.xmpp.PresenceServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>Presence</servlet-name>
    <url-pattern>/_ah/xmpp/presence/*</url-pattern>
</servlet-mapping>  
<!-- Handles the subscription part of XMPP. -->
<servlet>
    <servlet-name>Subscribe</servlet-name>
    <servlet-class>com.example.xmpp.SubscribeServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>Subscribe</servlet-name>
    <url-pattern>/_ah/xmpp/subscription/*</url-pattern>
</servlet-mapping>