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Since all EJB interfaces are POJIs, there isn t anything too remarkable in this code other than the @Local annotation specifying that it s a local interface. Recall that a business interface can be remote or even web service-accessible instead. We ll talk more about the three types of interfaces in section 3.2.3. The interesting thing to note right now is the fact that a single EJB can have multiple interfaces. In other words, EJB implementation classes can be polymorphic, meaning that different clients using different interfaces could use them in completely different ways.

The EJB bean class Just like typical OO programming, each interface that the bean intends to support must be explicitly included in the bean implementation class s implements clause. We can see this in the code for the PlaceBidBean from chapter 2:

2. Create a new Silverlight application called SimpleBehavior, as I do in Figure 7-22.

A right sidebar block that displays a list of the most recent blog items, with each item linking to the node s full-page view A list of images in a grid format that open a Lightbox2 view of the image when clicked A customized homepage that displays a single node depending on an active date field A sortable catalog with drop-down boxes, check boxes, and search boxes so a user can sort and limit content displayed by the view A list of the most recently purchased items on a user s account page A jQuery slideshow of images attached to a specific content type A full-page monthly calendar with event titles that link to the full-page event view, plus an accompanying mini-calendar that can fit in a sidebar

@Stateless public class PlaceBidBean implements PlaceBid { ... public PlaceBidBean() {} public Bid addBid(Bid bid) { System.out.println("Adding bid, bidder ID=" + bid.getBidderID() + ", item ID=" + bid.getItemID() + ", bid amount=" + bid.getBidAmount() + "."); return save(bid); } ... }

The PlaceBidBean class provides the concrete implementation of the addBid method required by the PlaceBid interface. Session bean implementation classes can never be abstract, which means that all methods mandated by declared business interfaces must be implemented in the class. Note that EJB implementation classes can have nonprivate methods that are not accessible through any interface. Such methods can be useful for creating clever unit-testing frameworks and while implementing lifecycle callback, as you ll learn in section 3.2.5. Also, an EJB bean class can make use of OO inheritance. You could use this strategy to support a custom framework for your application. For example, you could put commonly used logic in a parent POJO class that a set of beans inherits from.

3. In the Projects panel right-click the Solution and left-click Edit in Visual Studio, as I am doing

It is clear that session beans are POJOs. Since EJB annotations are ignored by the JVM, session beans can be unit-tested using a framework like JUnit or TestNG without having to deploy them into an EJB container. For more information on JUnit, browse www.junit.org. On the other hand, since several container-provided services such as dependency injection cannot be used outside the container, you cannot perform functional testing of applications using EJBs outside the container at least not easily.

My goal for this section is to explain the basic workflow of the views module and to demonstrate how to create a custom view for the front page. For more specific examples, such as how to create the views listed previously, check out Appendix B.

Now that we ve looked at the basic structure of session beans, we ll outline relatively simple programming rules for a session bean.

in Figure 7-23.

3.1.3 Understanding the programming rules Like all EJB 3 beans, session beans are POJOs that follow a small set of rules. The following summarizes the rules that apply to all types of session beans:

Figure 7-23. Edit the project in Visual Studio 2010. Visual Studio 2010 will open. Here is where we are going to add our Behavior. We are going to create a Behavior that will make an object change color when the mouse is down and then return to its original color when the mouse is up. Let s do that now: