CSCI 7818 bOP Intro: Why not J2EE?

of 11

• J2EE is not MVC:

  It is important to understand that Model, View, and Controller are usually not represented by individual classes; instead, they are conceptual subdivisions of the application.
     -- Java Pet Store Architectural Overview

• bOP PetShop vs. J2EE Pet Store
  • 20 bviews vs. 48 JSPs, 19 DTDs, 6 XSLs
  • 51 Perl classes vs. 271 Java files
  • 1 petshop.bconf vs. 75 XML and 3 properties files

• Compare Pet Store create_customer.jsp and edit_customer.jsp with View.account

• ShoppingClientBannerHelper is in the controller?

Notes:

J2EE is really a collection of disparate technologies. JSP is yet another template language.

EJB is a transaction management system which has morphed considerably from the original design. In particular, entity beans are now seen as a bad idea. Message beans were added much later and really are just another transport (JMS).

There is no controller in J2EE. Component coupling is implicit.