Java Tutorial - Java Scipt :
We’ve seen the presentation layers, such as servlets and JSPs, that provide the outward facing interfaces to enterprise applications, and have examined some of the lower-level infrastructure such as messaging. Now, we will tackle the meat and potatoes of the enterprise application: Enterprise Java Beans (EJB). EJBs are managed software components within the J2EE architecture. This chapter surveys the available open source options to develop and deploy EJBs. We will provide an overview of general EJB usage and issues, especially as concerns application architecture, and evaluate the EJB containers JBoss and JOnAS, the two current open source leaders.
