Download Applying Enterprise JavaBeans 2.1: component-based by Vlada Matena PDF

By Vlada Matena

As an authoritative source for utilizing firm JavaBeans (EJB) successfully to construct and combine even the most important platforms, utilizing company JavaBeans presents what IT managers and builders have to undertake this robust part ordinary effectively in new Java projects.Most books approximately EJB are robust on concept, yet are inclined to omit many info of the way to enforce parts in actual tasks. that is the place this article steps in, delivering genuine code (and actual layout judgements) for imposing other forms of JavaBeans, like consultation and entity Beans. higher but, it incorporates a case examine of a human assets advantages enrollment method that integrates facts from diversified proprietors and makes use of EJB to carry the knowledge jointly. (Using fictitious seller names like "Star Enterprise," "Wombat," and "Providence," the publication exhibits how EJB may end up in winning firm integration.)Subsequent chapters examine diversified facets of the program, from consultation Beans (including stateful Beans used to control periods) to exact examples of entity Beans in motion. there are many country transition diagrams (that express the interior workings of EJB in a number of eventualities) and resource code (useful for Java developers). with no really anchoring this fabric in a precise software server (which may make the publication much more practical), it does a superb task of fleshing out the EJB commonplace for actual tasks, exposing what relatively is going on among software server "containers" and the Beans they deal with, together with activation and passivation states.

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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. It is always better to catch errors at compile time rather than at runtime. Therefore, it is recommended that the enterprise bean class not implement the component interface.

Remote Home Interface The remote and local home interfaces share many commonalities but also have some key differences. The remote home interface is a valid remote interface for the Java RMI-IIOP. RemoteException and that the arguments and return values for all remote home interface methods are legal types for RMI-IIOP. EJBHome interface. Remote { void remove(Handle handle) throws RemoteException, RemoveException; void remove(Object primaryKey) throws RemoteException, RemoveException; EJBMetaData getEJBMetaData() throws RemoteException; HomeHandle getHomeHandle() throws RemoteException; } The EJBHome interface defines two remove methods.

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. The enterprise bean home interface, whether local or remote, controls the life cycle of the enterprise bean objects, defining the methods that create, find, and remove enterprise bean objects, as well as home methods that perform aggregate operations not specific to a bean instance.

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