To help keep the content up-to-date, we maintain the Struts 2 Documentation as a Confluence space, which is automatically exported to plain HTML. We serve the HTML version online and bundle it with the distribution. But don't let the wiki format fool you! There are over 600 pages of documentation in this space, easily the equivalent of a full length book!
Apache Struts 2 is an elegant, extensible framework for building enterprise-ready Java web applications. Distributions of Struts 2 are available as a free download under the Apache License.