Enterprise Applications

Download Beginning EJB 3, Java EE, 7th by Jonathan Wetherbee PDF

By Jonathan Wetherbee

Designated at Java and Java EE builders either with and with out earlier firm JavaBeans (EJB) adventure, starting EJB three, Java EE 7 version will consultant you in construction company software program in keeping with the most recent cross-platform criteria. tips on how to use the EJB three API to improve strong, standards-based backend enterprise good judgment for developing the complicated firm functions that run todays transactions and more.
With over two decades of mixed EJB adventure, the authors provide many useful insights into designing and coding EJB parts together with comparable Java EE applied sciences. EJB has made large advances within the ease of establishing company, server-side Java parts and company good judgment improvement, and has significantly simplified programming versions and layout styles. Use this e-book to harness that energy and take your small business Java improvement to the following point.

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Extra resources for Beginning EJB 3, Java EE, 7th

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Figure 2-7. chapter02 package. Similarly, the three client servlets appear under the Chapter02-SessionSamples-war node. 54 Chapter 2 ■ EJB Session Beans Figure 2-8. Verifying that Session Beans and their clients are available in the project Invoke the context menu on Chapter02-SessionSamples node and build the application by selecting the Clean and Build menu option. Figure 2-9. Building the application 55 Chapter 2 ■ EJB Session Beans Deploying the Session Beans and their Clients Once you have compiled the session beans and the servlet clients, you can deploy the application to the GlassFish application server.

Stateless; @Stateless(name="SearchFacade") public class SearchFacadeBean implements SearchFacade, SearchFacadeLocal { public SearchFacadeBean() { } } 28 4 Chapter 2 ■ EJB Session Beans The Business Interface A stateless session business interface is a standard Java interface with no other special requirements. This interface has a list of business method definitions that will be available for the client application. A session bean can have a business interface that is implemented by the bean class, generated at design time by tools such as JDeveloper, NetBeans, or Eclipse, or generated at deployment time by the EJB container.

Resources can be acquired by annotation of instance variables or annotation of the setter methods. 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’ll typically use the setter injections to preconfigure or initialize properties of the injected resource. Lifecycle Callback Methods There will be certain instances or use cases in which the application using session beans requires fine-grained control over lifecycle events like its own creation, removal, and so on.

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