This page contains a practical introduction to Enterprise Java Beans, prepared by Kantimahanti Prasad. We are just hosting this tutorial here. This paper covers the following topics:

Component Technology characteristics Standard Infrastructure needs Application Servers Containers J2EE Architecture and its components EJB Model, Overview & JNDI EJB Specifications, Roles EJB Design Approaches, Architecture Types of Beans EJB Interfaces & Session Contexts Life cycles of different Beans EJB Jar files & Deployment Descriptor Sample examples Components comparison

and download the whole tutorial: A Practical approach to EnterPrise Java Beans

See also Other tips from Coldbeans.