J2EE Architecture
J2ee application architecture - This Java 2 Enterprise Edition tutorial introduces the architecture of J2EE application. Here you will see certain definition and difference between both presentation logic and business logic of any J2EE application.
What are the file structures for J2EE application, what is the use of EJB application and so on? This J2EE application architecture tutorial includes the information on this entire topic.
Just go through the given tutorial to clear your all doubts and understand this concept in detail.
http://www.roseindia.net/software-tutorials/detail/6223
http://www.roseindia.net/javabeans/j2eearchitecture.shtml
This J2EE application architecture tutorial is very helpful document for any J2EE beginners to start with.