When using the Calyxo controller, there's nothing to do: the Calyxo Base component is a mandatory part of the Calyxo platform and is always available.

In order to use the Calyxo Base component with Struts, it must be somehow integrated into the application's controller. This is achieved by the Calyxo Base plugin for Struts. See the Calyxo Struts component for instructions on loading the plugin.