By Raghu R. Kodali, Jonathan R. Wetherbee, Peter Zadronzy,
Firm JavaBeans 3.0 (EJB 3.0) is an important component to Sun’s new light-weight Java company version five platform (Java EE 5). they're used for the improvement and deployment of component-based firm enterprise functions equivalent to transaction-based functions. Ever considering its first unencumber, EJB has been the topic of a lot media consciousness and no little controversy. EJBs signify a worldly and robust expertise and EJB-based purposes can aid excessive numbers of transactions and clients, with greatest safety. even though, earlier incarnations of EJB have grow to be seemed through many as an excessively advanced expertise that may result in high priced and time-consuming suggestions which are tricky to construct, enforce and keep. the recent light-weight EJB three is determined to alter all that. It has made large advances in ease of improvement, and its vastly simplified programming version has been largely acclaimed and embraced. starting EJB three takes the reader in the course of the information of the EJB 3.0 structure, and exhibits how EJB can be utilized to enhance robust, standards-based backend company good judgment. With 12 years of mixed EJB event, the authors supply many sensible insights into the full EJB structure, protecting all components of the EJB 3.0 specification, together with its new endurance framework, simplified improvement version, and different key new gains.
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Extra info for Beginning EJB 3 Application Development: From Novice to Professional (Beginning: from Novice to Professional)
Click the OK button. ■Note Substitute the directory in which you have installed J2SE for C:\software\jdk15. Figure 1-6. The New User Variable dialog Similar to the preceding step, add two more environment variables, GLASSFISH_HOME and ANT_HOME. Substitute the directory names in which you have installed the GlassFish application server. Figure 1-7 shows the Environment Variables dialog after adding the values. Figure 1-7. The completed Environment Variables dialog Click OK on the Environment Variables and System Properties dialogs.
The SearchFacade bean will access back-end databases to retrieve the requested information. To simplify the code examples in this chapter, we will actually retrieve the list of hard-coded values within the bean class. In later chapters, we will augment the SearchFacade bean to access the back-end database. 3. The bean returns to the client applications the information that satisfied the search criteria. Listing 2-1 shows the definition of the SearchFacade bean. In the following sections of this chapter, we will build the code that will show the preceding workflow in action.
Listing 2-5 shows an example of setter and instance variable–based injection of myDb, which represents the data source. Listing 2-5. myDb = myDb; } You typically use the setter injections to preconfigure or initialize properties of the injected resource.