Applying Enterprise JavaBeans 2.1: component-based by Vlada Matena

By Vlada Matena

As an authoritative source for utilizing firm JavaBeans (EJB) successfully to construct and combine even the biggest platforms, using company JavaBeans offers what IT managers and builders have to undertake this robust part typical effectively in new Java projects.Most books approximately EJB are powerful on concept, yet are likely to miss many info of ways to enforce parts in actual initiatives. that is the place this article steps in, supplying actual code (and genuine layout judgements) for enforcing other kinds of JavaBeans, like consultation and entity Beans. greater but, it includes a case learn of a human assets merits enrollment approach that integrates info from diverse proprietors and makes use of EJB to carry the information jointly. (Using fictitious seller names like "Star Enterprise," "Wombat," and "Providence," the publication indicates how EJB may end up in profitable company integration.)Subsequent chapters examine diverse facets of the program, from consultation Beans (including stateful Beans used to control periods) to specified examples of entity Beans in motion. there are many country transition diagrams (that express the interior workings of EJB in numerous situations) and resource code (useful for Java developers). with out really anchoring this fabric in an exact program server (which could make the booklet much more practical), it does an excellent activity of fleshing out the EJB commonplace for genuine 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

Sample text

1 architectures, most code is developed using local interfaces, and remote interfaces are used less frequently. To keep the code of these tightly coupled beans concise, leave the names of the local interfaces as is, and prepend Remote to the remote home and component interfaces. ♦ When migrating from earlier versions of the EJB architecture, particularly if retaining the use of remote interfaces, to resolve ambiguities, the local home interface is the business entity name with LocalHome appended.

The first method removes an enterprise bean object identified by a handle, an object that provides a reference to an enterprise bean object and that can be stored in persistent storage. The second method, which pertains only to entity beans, removes an enterprise bean object identified by a primary key. The method getEJBMetaData returns the metadata interface for the enterprise bean. Clients that use dynamic invocation that is, clients written using a scripting language use the EJBMetaData interface; its use is not discussed in this book.

EntityBean, Account { ... public Account returnSelfWrong() { ... return this; // THIS WOULD CAUSE A RUNTIME ERROR } public Account returnSelfCorrect() { ... getEJBObject(); // CORRECT } } What could happen with the preceding code? 8 illustrates, the programming error is detected at runtime, not at compile time. To put it another way, the application has a programming error that is detected only at runtime, not before. If the AccountBean class does not implement the Account interface, the Java compiler detects the programming error when compiling the returnSelfWrong method.

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