By Jonathan Wetherbee
Precise at Java and Java EE builders either with and with out past company JavaBeans (EJB) event, starting EJB three, Java EE 7 variation will consultant you in construction firm software program in accordance with the most recent cross-platform criteria. the right way to use the EJB three API to improve strong, standards-based backend enterprise good judgment for developing the advanced company purposes that run todays transactions and more.
With over twenty years of mixed EJB event, the authors supply many functional insights into designing and coding EJB parts together with similar Java EE applied sciences. EJB has made large advances within the ease of creating firm, server-side Java elements and company common sense improvement, and has vastly simplified programming types and layout styles. Use this publication to harness that strength and take what you are promoting Java improvement to the following point.
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Additional resources for Beginning EJB 3, Java EE, 7th
NoSuchEJBException. Once a singleton session bean is instantiated successfully, it will not be destroyed if exceptions are thrown from either business methods or callbacks. 45 Chapter 2 ■ EJB Session Beans Timer Service The EJB Timer Service is a container-managed service that allows callbacks to be scheduled for time-based events. Timer notifications can be scheduled to occur at a calendar based schedule, at a specific time, after a specific time, or at specific recurring intervals. Use timers for application level processes.
Through examples, these chapters explain the major areas of the persistence-programming model. They are not meant, however, to be a substitute for the expansive JPA specification. We encourage you to refer to the JPA spec when you’re ready to explore details that go beyond the scope of this discussion. Table 3-1 summarizes what we’ll be covering in this chapter. 61 Chapter 3 ■ Entities and the Java Persistence API Table 3-1. Key Topics in this Chapter Concept Description An entity example We begin with a simple JavaBean and progressively add annotations required to transform it into a simple entity and then beyond.
EJB containers or application servers provide deployment utilities or Ant tasks to facilitate deployment of EJBs. Java IDEs (integrated development environments) like JDeveloper, NetBeans, and Eclipse also provide deployment features that allow developers to package, assemble, and deploy EJBs to application servers. Packaging, assembly, and deployment are covered in detail in Chapter 11. So far in this chapter we have developed one stateless session bean (SearchFacade), one stateful session bean (ShoppingCart), and one singleton session bean (ShopperCount).