This is a guide to developing Java EE 5 applications deployed to the high-performance, Java EE 5-compliant GlassFish application server, which is quickly gaining massive popularity. After GlassFish installation and configuration, it covers application development, including all major Java EE 5 APIs: JSPs, JSTL, Servlets, and JSF for web applications; the Java Persistence API and JDBC to interact with RDBMS; EJB 3, including container-managed transactions and EJB declarative security through annotations; the JMS API for messaging; the JAAS API for secure applications; frameworks built on the Java EE 5 specification, including Seam, Facelets, and Ajax4jsf. It is aimed at Java developers wishing to become proficient with Java EE 5, who are expected to have some experience with Java and J2EE technologies and to have developed and deployed applications in the past, but need no previous knowledge of Java EE, and will teach the reader how to use GlassFish to develop and deploy applications.