Download Beginning EJB 3, Java EE, 7th by Jonathan Wetherbee PDF
By Jonathan Wetherbee
Detailed at Java and Java EE builders either with and with no previous company JavaBeans (EJB) event, starting EJB three, Java EE 7 version will advisor you in development firm software program in keeping with the newest cross-platform criteria. methods to use the EJB three API to increase robust, standards-based backend company common sense for developing the advanced company purposes that run todays transactions and more.
With over two decades of mixed EJB event, the authors supply many useful insights into designing and coding EJB elements together with similar Java EE applied sciences. EJB has made large advances within the ease of establishing firm, server-side Java parts and company common sense improvement, and has tremendously simplified programming types and layout styles. Use this booklet to harness that strength and take your business Java improvement to the subsequent point.
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Extra info for Beginning EJB 3, Java EE, 7th
Sample text
The ShoppingCart session bean has both remote and local interfaces, as shown in Figure 2-6. Figure 2-6. Business interfaces for ShoppingCart We will primarily use the local interface from our web application. The remote interface is added to facilitate unit testing of the bean in this chapter. Listings 2-10 and 2-11 show the remote and local ShoppingCart business interfaces, with @Remote and @Local annotations, respectively. Listing 2-10. Remote; @Remote public interface ShoppingCart { } Listing 2-11.
Table 2-2. Considerations for Choosing Between Local and Remote Clients • Remote Local Loose coupling between the bean and the client Lightweight access to a component Location independence Location dependence Expensive remote calls Must be collocated with the bean Objects must be serialized Not required Objects are passed by value Objects are passed by reference Web Services: You can publish stateless session beans as web services that can be invoked by Web Services clients. We will discuss Web Services and clients in Chapter 6.
Listing 2-13. cartItems = cartItems; } public ArrayList getCartItems() { return cartItems; } } 38 Chapter 2 ■ EJB Session Beans Lifecycle Callback Methods Stateful session beans support callback events for construction, destruction, activation, and passivation. Following are the callbacks that map to the preceding events: • PostConstruct: Denoted with the @PostConstruct annotation. • PreDestroy: Denoted with the @PreDestroy annotation. • PreActivate: Denoted with the @PreActivate annotation. • PrePassivate: Denoted with the @PrePassivate annotation.