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As we mentioned earlier, EJB 3 makes O/R mapping a lot easier, but not quite painless. This is largely because of the inherent complexity of ORM and the large number of possible combinations to handle. The good news is that a project to create an Eclipse-based EJB 3 mapping tool code-named Dali is under way (www.eclipse.org/ dali/). The project is led by Oracle and supported by JBoss and BEA. It will be a part of Eclipse web tool project (WTP) and will support creating and editing EJB 3 O/R mappings using either annotations or XML. Also, two commercial products, Oracle JDeveloper and BEA Workshop, support development of EJB 3 applications.

@Remote(BidManager.class) @Stateless public class BidManagerBean { ... }

To keep this book as clear and easy to follow as possible, the following text conventions are used throughout:

The next set of configuration settings impacts the way the content is output in the page, block, or feed display. Note that in this section, in order to override the default display, you must click the category header (that is, Header, Footer, Empty te x t , or Fields), as shown in Figure 7-13.

The preceding code marks the BidManager interface as remote through the bean class itself. This way, if you change your mind later, all you d have to do is change the access type specification in the bean class without ever touching the interface. Next, we move on to discussing the EJB lifecycle in our example.

We introduced you to lifecycle callback methods, or callbacks, earlier in the chapter; now let s take a deeper look at how they are used with stateless session beans. As far as EJB lifecycles go, stateless session beans have a simple one, as depicted in figure 3.5. In effect, the container does the following:

Important words or concepts are normally highlighted on the first appearance in italics. Code is presented in fixed-width font, as are the names of most objects, controls, properties, and classes.

Figure 3.5 The chicken or the egg the stateless session bean lifecycle has three states: does not exist, idle, or busy. As a result, there are only two lifecycle callbacks corresponding to bean creation and destruction.

Figure 7-13. Click the category header to override the default view settings. You ll also notice that each category has a plus icon and an icon with arrows pointing up and down. Clicking the plus icons opens a form underneath the main view so that you can add one or more customized fields. If there is more than one customized field in a category, the arrow icon allows you to adjust the relative height of each customized field.

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Menu commands are written in the form Menu Submenu Submenu. Where I want to draw your attention to something, I ve highlighted it like this:

Creates bean instances using the default constructor as needed. Injects resources such as database connections. Puts instances in a managed pool. Pulls an idle bean out of the pool when an invocation request is received from the client (the container may have to increase the pool size at this point). Executes the requested business method invoked through the business interface by the client. When the business method finishes executing, pushes the bean back into the method-ready pool. As needed, retires (a.k.a. destroys) beans from the pool.