The struts config should have some defaults setup for your app.
For each action that accepts input from the user there should be a form attached to it, and a jsp/tile to go back to in case of errors should be specified as the input attribute (see SearchPeople for an example).
Your app can have multple entry points. Each of these should be like the EntryAction example provided.
For actions that don't need input, they should not have a form.