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The Spring MDP is easy to develop and use but is not based on Java EE standard specifications. Using the MDP and Spring message container may not be suitable for large-scale enterprise requirements.

Let s begin with a scenario that is very common with modern web applications. A servlet calls out to a session bean to execute a query and receives a collection of entities in return. The servlet then places these entities into the request map and forwards the request to a JSP for presentation. This pattern is called Page Controller,1 a variation of the Front Controller 2 pattern in which there is a single controller for each view instead of one central controller for all views. In the context of the familiar Model-View-Controller (MVC) architecture, the session bean provides the model, the JSP page is the view, and the servlet is the controller.

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cfg package to configure itself Although you should be aware of what these classes do for the Configuration class, you will typically only interact with the Configuration class directly The Configuration constructor creates a new instance of the orghibernatecfgSettingsFactory class for use in the Configuration The settings factory creates a new instance of orghibernatecfgSettings out of the Hibernate configuration properties These properties could be in a hibernateproperties file located in the root of the classpath or the Java system properties The buildSessionFactory() method on the Configuration class creates an instance of the SessionFactory: public SessionFactory buildSessionFactory() throws HibernateException The SessionFactory is a heavyweight object, and your application should use one Hibernate SessionFactory object for each database it interacts with The SessionFactory relies on the configuration properties, which we discuss in the next section of this chapter.

Fowler, Martin. Patterns of Enterprise Application Architecture. Boston: Addison-Wesley, 2002.

Generating policy quotations was one very important service provided by the eInsure application. This service would accept the bare minimum information: the policy amount, the number of years of coverage (the term ), the frequency of premiums, and, of course, the insurance product against which the policy is underwritten. Given these inputs, the output would be the tentative premium to be paid by the client. This service was available in the online eInsure application and was used heavily at the counters by the underwriters and support executives. However, the partners, resellers, and agents of the company using eInsure but without direct access to the application also wanted to use this functionality. There were others like the affiliates who wanted to integrate only this functionality into their utility web sites as widgets. The policy quotation service was accessible remotely through a session facade. However, the actual functionality was implemented as a POJO application service. Most of these external applications were running on PHP, and others were running on the Microsoft .NET platform. It is possible to have a non-Java client for EJB, but this was not within the skill set of the team developing those external applications. In such situations, an alternative is to expose these services in a technology- or platform-independent manner. Web services are a perfect solution. Exposing the policy quote function as a web service would enable any external application to consume it without being inhibited by technology barriers.

Alur, Deepak, John Crupi, and Dan Malks. Core J2EE Patterns: Best Practices and Design Strategies, Second Edition. Upper Saddle River, N.J.: Prentice Hall PTR, 2003.

First consider the session bean that will produce the results that will be rendered by the JSP page. Listing 6-23 shows the bean implementation. In this example, we are looking at only the findAll() method, which returns all the Employee instances stored in the database. Listing 6-23. The EmployeeService Session Bean @Stateless public class EmployeeServiceBean implements EmployeeService { @PersistenceContext(unitName="EmployeeService") private EntityManager em; public List findAll() { return em.createQuery("SELECT e FROM Employee e") .getResultList(); } } // ...

After you obtain the SessionFactory, you can retrieve Hibernate orghibernateSession objects These Session objects are lightweight, as opposed to the SessionFactory object You perform your persistence operations with the Session object In 3, we present an example that walks you through a simple application that uses Hibernate for data persistence..

It is required to expose internal services to external clients. The services should be exposed in a technology-neutral way. Open standards are preferred for exposing services while integrating with external systems.

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