By Vlada Matena
As an authoritative source for utilizing company JavaBeans (EJB) successfully to construct and combine even the biggest platforms, employing company JavaBeans presents what IT managers and builders have to undertake this strong part general effectively in new Java projects.Most books approximately EJB are robust on conception, yet are likely to pass over many info of the way to enforce elements in actual initiatives. that is the place this article steps in, supplying actual code (and genuine layout judgements) for imposing other kinds of JavaBeans, like consultation and entity Beans. larger but, it encompasses a case research of a human assets merits enrollment process that integrates information from assorted owners and makes use of EJB to carry the knowledge jointly. (Using fictitious seller names like "Star Enterprise," "Wombat," and "Providence," the booklet exhibits how EJB can result in winning firm integration.)Subsequent chapters examine diversified points of the program, from consultation Beans (including stateful Beans used to control periods) to designated examples of entity Beans in motion. there are many nation transition diagrams (that express the interior workings of EJB in various situations) and resource code (useful for Java developers). with out really anchoring this fabric in an exact software server (which could make the ebook much more practical), it does a very good task of fleshing out the EJB ordinary for actual tasks, exposing what quite is going on among software server "containers" and the Beans they deal with, together with activation and passivation states.
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Additional info for Applying Enterprise JavaBeans 2.1: component-based development for the J2EE platform
Rather, it is intended to give you an idea of the information contained in the descriptor. For example, the ejb-name element specifies the name that the bean developer gives to the enterprise bean. The home and remote elements specify the fully qualified names of the enterprise bean home and remote interfaces. ) The ejb-class element specifies the fully qualified name of the enterprise bean class. The persistence-type element specifies that the enterprise bean uses bean-managed persistence. The prim-key-class element specifies the Java class of the entity bean's primary key.
EJB Roles in an Enterprise Environment 53 54 Usually, at least several distinct parties are responsible for these six roles, and these roles or the functional areas they represent are interdependent. Therefore, the EJB architecture specifies a contract, or set of requirements, for each role. These requirements ensure that the product of one EJB role is compatible with the product of the other EJB roles. How do typical enterprise software people fit in with the EJB architecture roles? That is, how do "traditional" information systems individuals and ISVs fit into EJB roles?
2 summarizes the differences between local and remote client views. 2. 2 Enterprise Bean Home Interfaces An enterprise bean defines a home interface that corresponds to its client view. As explained earlier, a bean can define a remote client view, a local client view, a Web service client view, or all three. ) A bean that implements a remote client view implements a home interface that extends the EJBHome interface. Similarly, a bean that implements a local client view implements a home interface that extends the EJBLocalHome interface.