A portal instance is simply a web application deployed as a WAR in an application server. Portlets are also part of an enhanced WAR called a portlet application.

GateIn 3.2 does not require any particular setup for your portlet in most common scenarios and the web.xml file can remain without any GateIn 3.2 specific configuration.

During deployment, GateIn 3.2 will automatically and transparently inject a servlet into the portlet application to be able to interact with it. This feature is dependent on the underlying servlet container but will work out of the box on the proposed bundles.