This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
Have you looked at the Struts Documentation?
Struts plugins are used to extend the framework (for example, to provide REST support). It sounds like what you want to do is provide application-level functionality. I would probably use a ServletContextListener to take care of any application setup tasks.