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The main disadvantage to the Java EE architecture is its complexity. To be able to program with the Java EE APIs as a software maintainer you must know the fundamentals of Java very well. To be able to effectively develop code in the Java EE environment, you should understand the more advanced object-oriented features of the language, including the various design patterns; see Core J2EE Patterns: Best Practices and Design Strategies (2nd Edition) by Deepak Alur, Dan Malks, and John Crupi, Prentice Hall (May 2003). Because of the complexity and size of Java EE applications, teams of individuals are typically needed to assist in all phases of the traditional Software Development Lifecycle (SDLC) process. Even though a handful
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of people could wear the hats of requirement engineer, system architect, designer, developer, tester, and deployer, it is more effective to have individuals specializing in their given area.
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Enterprise systems can be broken into multiple tiers. A common Java-based architecture design is the separation of application functionality into three distinct tiers. Unfortunately, various terms are used to describe each tier, which can lead to some mild confusion. Table 12-3 details some of the common terms you will see in references to the different tiers related to Java EE architecture. The webtier and the business tier are parts of the middle tier. The database tier is the most common component of the EIS tier. The client tier includes web browsers and client-based applications.
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The web tier is the tier within an enterprise system that contains the presentation layer. Servlets and JavaServer Pages are part of the web tier. These are web application technologies used for creating dynamic web content. JavaServer Pages deliver web pages from the web tier. Servlets handle HTTP web requests from the web tier. There are many web containers that implement the JSP and servlets specifications such as Apache Tomcat, Jetty, and the Sun Java System Web Server. Web containers such as Apache Tomcat can run alone or on top of an application server such as Geronimo Application Server or Sun s Glassfish. Alone, Apache Tomcat must run with a JRE or JDK, shown in Figure 12-1. The Sun Java System Web Server has extended functionality to support specifications outside of Java s domain, such as Microsoft s Active Server Pages, Adobe Coldfusion, PHP: Hypertext Preprocessor (PHP), and the Common Gateway Interface (CGI).
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TABlE 12-3
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Client Tier (Client layer)
Commonly known as the client layer (includes web browsers and client-based applications)
Middle Tier (Service layer)
Web tier (a.k.a.) front-end server tier presentation tier GUI layer client tier (too) *Includes web container Business tier (a.k.a.) backend server tier middleware * Includes EJB container
EIS Tier (Backend layer)
(a.k.a.) backend tier database tier data tier
12:
Understanding Server-Side Technologies
FIgURE 12-1
The Web Tier Web Container
The web tier
JavaServer Pages
Servlets
Java Development Kit or Java Runtime Environment
The JavaServer Faces (JSF) API and JavaServer Pages Standard Tag Library (JSTL) provide additional web contents solutions. JSF is a user-interface component framework that lets you easily build components, add validators and converters to the values of those components, and provides page navigation and state management support. JSTL is a tag library that is built off of the JSP framework.
Understanding the Business Tier
The business tier is the tier within an enterprise system that contains the business logic. Enterprise JavaBeans is one of the major components of the business tier. The other major components are the JAX-WS web service endpoints and the Java Persistence API entities, as shown in Figure 12-2. The Java Persistence API supersedes EJB entity beans. The exam focuses on Enterprise JavaBeans, which is covered in the section Enterprise JavaBeans API.
Understanding the EIS Tier
The Enterprise Information System (EIS) tier is the tier within an enterprise system that contains the data layer. Common activities are persistence support through database management systems. The EIS tier includes databases, relational databases, legacy applications, enterprise resource planning systems, CRM systems, and legacy data stores. The EIS tier is typically on its own machine. For example, an enterprisescale Oracle database can reside on its own server and is interfaced with remotely.
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