Application Server can be purchased by itself or as a component of Sun Java Enterprise System (Java ES), a software infrastructure that supports enterprise applications distributed across a network or Internet environment. If you purchased Application Server as a component of Java ES, you should be familiar with the system documentation at http://docs.sun.com/coll/1286.2. The URL for all documentation about Java ES and its components is http://docs.sun.com/prod/entsys.5.
For documentation about other stand-alone Sun Java System server products, go to the following:
A Javadoc tool reference for packages provided with the Application Server is located at http://glassfish.dev.java.net/nonav/javaee5/api/index.html. Additionally, the following resources might be useful: