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Wiley - Mastering Enterprise Java Beans

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The server side has different kinds of needs from a rich GUI environment. Server-side components need to run in a highly available (24x7), faulttolerant, transactional, and multiuser secure environment. An application server provides this high-end server-side environment for the enterprise beans, and it provides the runtime containment necessary to manage enterprise beans. Finally, note that applets, servlets, and enterprise beans are not “either-or” technologies. You can use JavaBeans as development component building blocks for constructing deployable enterprise beans.

N-Tier Architectures An N-tier architecture adds one or more tiers to the two-tier model. In N-tier deployments, your presentation layer, business logic layer, and data layer are separated into respective physical tiers. With four or more tiers, you decompose each of these layers even further to allow various parts of your system to scale independently. 8. A three-tiered Web-based deployment is typically broken down as follows: Your presentation tier runs within the address space of one or more Web servers.

The cornerstone of J2EE is Enterprise JavaBeans (EJB), a standard for building server-side components in Java. J2EE simplifies many of the complexities surrounding the construction of a scalable, component-based server-side application, and it is very analogous to Windows DNA. The most notable exception is that J2EE is a specification, 26 MASTER I NG ENTE RP R ISE JAVABEAN S whereas Windows DNA is a product. J2EE specifies the rules of engagement that people must agree on when writing enterprise software.

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