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Figure 12.4 ActionBazaar application architecture. The ActionBazaar web module accesses the EJBs that implement the business logic and manipulate entities.

6. Next draw a Rectangle out for what is to be the background for the dialog box. 7. Add text that thanks the shopper for the purchase and a couple of Buttons that give them the

The Link module (http://drupal.org/project/link) allows you to add a field type specifically for links, including the URL, title, target attribute, and rel=nofollow attribute.

Dependency injection is by far the easiest way to access an EJB 3 session bean. In this section you ll see how to use dependency injection from the web module to access a session bean. You learned about the @EJB annotation in chapter 3, and you probably want to jump into using dependency injection for all your session beans. However, we ll explain why you would want to avoid using dependency injection when accessing a stateful session bean from a multithreaded client. You can obtain a reference to an EJB in your managed class by using injection in one of two ways:

By using the @EJB annotation By using the ejb-ref or ejb-local-ref element in the web.xml deployment descriptor

option to continue shopping or to check out, as I have done in Figure 16-21.

Assume that ActionBazaar uses a controller servlet. You can use @EJB to inject a reference to an EJB as follows:

Objects and Timeline panel, as I have done in Figure 16-22.

The Name module (http://drupal.org/project/name) provides several components used to enter a person s name:

public class ActionBazaarBidControllerServlet extends HttpServlet { @EJB private PlaceBid placebid; ... placeBid.addBid(bidderId, itemId, ... }

bidPrice);

Figure 16-22. Select the objects that make up the fake dialog box in the Objects and Timeline panel.

This example shows the PlaceBid EJB being injected into the ActionBazaarBidControllerServlet. The @EJB annotation here is clean and straightforward. If instead we use the ejb-ref or ejb-local-ref element in the deployment descriptor, we would have a web.xml like this:

Title, such as Mr., Mrs., Dr., and so on Given name, or first name Middle name Family name, or last name Generational suffix, such as II, III, Jr., and so on Credentials, such as CPA, and so on

<ejb-ref> <ejb-ref-name>PlaceBid</ejb-ref-name> <ejb-ref-type>Session</ejb-ref-type> <remote>actionbazaar.buslogic.PlaceBid</remote> <injection-target> <injection-target-name>placeBid</injection-target-name> <injection-target-class> actionbazaar.web.ActionBazaarBidControllerServlet </injection-target-class> </injection-target> </ejb-ref>

Grid, as I am doing in Figure 16-23.

Avoid injecting stateful session beans If you are using stateful session beans, then you must avoid injecting them into classes that are multithreaded in nature, such as servlets and JSF managed beans. Let s look at an example. Suppose you inject the BidderAccountCreator bean into a servlet that is multithreaded, as shown here:

@Stateful(name = "BidderAccountCreator") public class BidderAccountCreatorBean { private LoginInfo loginInfo; private BiographicalInfo biographicalInfo; private BillingInfo billingInfo; @Remove public void cancelAccountCreation() { ... } }

10. Rename the dialog box Grid DialogBox. 11. With the DialogBox Grid still selected, change the Opacity to 0% in the Appearance bucket of

All components are available to Views, meaning you can sort by last name while displaying the full name, making this a good alternative to using regular text fields when entering people s names.

In this case, the single BidderAccountCreator instance will be shared by all users of the servlet. This is not the desired behavior since loginInfo, biographicalInfo, and billingInfo are designed to be specific to an individual client. This becomes trickier when we have a method annotated with the @Remove annotation. When a particular user invokes the cancelAccountCreation method, the EJB instance will be destroyed. The next time a user tries to access the BidderAccountCreator EJB, the container will generate a javax.ejb.NoSuchEJBException. If you want to use stateful session beans in your web application, then you need to perform a JNDI lookup and store the returned EJB instance in the HttpSession object. This way, the same user reaches the same bean instance for future activity. This also scopes the EJB instance to the user s session, avoiding the possibility of other sessions acquiring or deleting it. We ll explain more about working with stateful session beans in section 12.2.4.