As java has progressed from 2003 to 2009. A lot of chnged in java and java ee… you can see so much of customizations from presentation layer to model layer and ofcourse controller part( with active support)…

EJB 3.0 is one of the major changes ( which makes easier to code if compared to its previous versions).

Major changes in ejb3.0 from ejb2.1

• annotations ( not present in j2sdk1.4)
• home interface removed, remote interface is very clear in ejb3.0( you don’t have to write “rmi” and related code..)
• new persistence concept which removes some confusing concept in ejb2.0.
• used as pojo removing vendor specific codes.. which is present in older versions of ejb.
• the enterprise java beans runs on any server which support ejb3.0 specification.