It doesn't exist "official" support for using MongoDB in Web Apps. I attach my Java code with my idea to help support for Web. To use it, declare the Servlet Context Listener in the web.xml like this :

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<listener>
<listener-class>com.mongodb.web.MongoServletContextListener
</listener-class>
</listener>

<context-param>
<param-name>mongoURI</param-name>
<param-value>mongodb://localhost:27017</param-value>
</context-param>
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This listener :

• on the contextInitialized : initialize the static variable Mongo of the MongoProvider with the "mongoURI" param-value.
• on the contextDestroyed : close the connection of the static variable Mongo

Once this listener is started, you can use MongoProvider.getMongo() in any code (Servlet, Filter, Services, etc) to use Mongo.