Introducing the concept of layering
How EJB helps in layering applications
Understanding the persistence framework
Going through a few examples
So far, we have covered a facet of web applications development which included the simple or not too-complex sort of scenarios. However, enterprise applications are characterized by the presence of rich interfaces, large number of components, persistence mechanisms, need for fail-safe transactions mechanism, message queues, server/database clustering, and many such combinations.
At a high level, this calls for an engineering approach involving distributed systems and the need for a layered architecture. Development of complex enterprise ...