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Additional resources for Beginning J2EE 1.4. From Novice to Pro
Enter Enterprise JavaBeans. EJBs are Java components that implement business logic. This allows the business logic of an application (or suite of applications) to be compartmentalized into EJBs and kept separate from the front-end applications that use that business logic. qxd 15/1/04 7:28 pm Page 17 J2EE Essentials The J2EE architecture includes a server that is a container for EJBs. The EJB container loads the bean as needed, invokes the exposed operations, applies security rules, and provides the transaction support for the bean.
J2EE provides intrinsic support for distributed database transactions. J2EE provides configurable security to ensure that sensitive systems are afforded appropriate protection. Security is provided in the form of authentication and authorization. After reading through the chapter, you might think that J2EE is just about EJBs. The truth is that it is about a lot more than EJBs, although EJBs do play a prominent role within J2EE. J2EE provides a platform for developing and deploying multi-tiered, distributed applications that are designed to be maintainable, scaleable, and portable.
The W3C consortium, in an effort to unify how web services are published, discovered, and accessed, has sought to provide more concrete definitions for web services: “A web service is a software system identified by a URI, whose public interfaces and bindings are defined and described using XML. Its definition can be discovered by other software systems. org/TR/ws-arch] This specifies some specific requirements: ❑ XML is used to publish the description of the services. ❑ Those descriptions are discoverable through some form of registry.