J2EE has become required knowledge for any serious Java developer, but learning this large and complex specification requires a substantial investment of time and energy. Sams Teach Yourself J2EE in 21 Days presents the enterprise Java architecture in accessible, easy-to-comprehend lessons, describing how each J2EE tool solves the challenges of n-Tier development. Using the architecture as a roadmap, following chapters describe Enterprise JavaBeans (EJB), JavaServer Pages (JSP), Servlets, and more, giving readers a full understanding of J2EE development. Further chapters cover the role of XML, custom JSP tags, and how Java Connectors allow J2EE applications to interact with legacy and non-Java systems. The book finishes with sample applications which...