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Extra info for Sun Certified Enterprise Architect for Java EE study guide

Sample text

Defining a clear scope is the first step to limiting unexpected changes to a system. Anticipate expected changes—You should identify the commonly changed areas of the system (for example, the user interface technology), and then isolate these areas into coherent components. By doing this, you can prevent ripple effects of propagating the change across the system. Design a high-quality object model—The object model of the system typically has an immediate impact on its extensibility and flexibility.

Scenarios where ease of development is key, where an existing application is already web-centric, or where transactions are not key to the business (read-only or readmostly) mean that you should choose a web-centric answer from those provided in the exam. There are some stand-out reasons where using EJB is simply not warranted. The most straight-forward example is a standard Create, Read, Update, and Delete (CRUD) application built using Struts to organize and control the presentation and business logic tiers, and Hibernate plus a DAO access layer to implement the persistence tier.

However, all mainstream frameworks now embrace Model 2 exclusively—where views (implemented as JSP pages with or without JSF components) forward to a central controller (implemented as a Servlet), which invokes a named handler for the page or action before forwarding the user to a welldefined page to render the outcome of the request. ” Simply put, one of the biggest advantages of the JEE platform is how much it gives the developer out of the box from an infrastructure perspective, leaving the developer free to focus on how to use the JEE platform to implement the required Prerequisite Review 37 business logic for their application.

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