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As we discussed earlier in section 3.1.2, a session bean must have at least one business interface. The session bean class must be concrete. You cannot define a session bean class as either final or abstract since the container needs to manipulate it. You must have a no-argument constructor in the bean class. As we saw, this is because the container invokes this constructor to create a bean instance when a client invokes an EJB. Note that the compiler inserts a default noargument constructor if there is no constructor in a Java class. A session bean class can subclass another session bean or any other POJO. For example, a stateless session bean named BidManager can extend another session bean PlaceBidBean in the following way:

You access the views interface by navigating to Structure Views, as shown in Figure 7-7. Two tabs are available, LIST (default) and TOOLS. The default LIST page lists all views currently on the site, along with several drop-downs to sort and restrict the list. Individual views can be either enabled or disabled; the views module provides a number of default views available to override system-generated pages. Once enabled, a default view can be edited, exported for use on another Drupal installation, cloned, or disabled; only created views can be deleted. Note the system message about installing and enabling the advanced_help module (http://drupal.org/project/advanced_help); this can be a great resource when creating a view.

@Stateless public BidManagerBean extends PlaceBidBean implements BidManager { ... }

1. The first thing to do is add a new class to our project that will be our Behavior class. To do that

The business methods and lifecycle callback methods may be defined either in the bean class or in a superclass. It s worth mentioning here that annotation inheritance is supported with several limitations with EJB 3 session beans. For example, the bean type annotation @Stateless or @Stateful specified in the PlaceBidBean superclass will be ignored when you deploy the BidManagerBean. However, any annotations in the superclasses used to define lifecycle callback methods (more about that later in this section) and resource injections will be inherited by the bean class. Business method names must not start with ejb. For example, avoid a method name like ejbCreate or ejbAddBid because it may interfere with EJB infrastructure processing. You must define all business methods as public, but not final or static. If you are exposing a method in a remote business interface of the EJB, then make sure that the arguments and the return type of the method implement the java.io.Serializable interface.

You ll see these rules applied when we explore concrete examples of stateless and stateful session beans in sections 3.2 and 3.3, respectively.

right-click the project in Visual Studio s Solution Explorer and click Add Figure 7-24. Class, as I do in

I ll discuss a couple of the drop-down selectors on this page just to give you an idea of how views works. Storage refers to how a view is saved and can be either normal, default, or overridden. A default view is either a view provided by views or a contrib module that is unaltered, such as the archive or frontpag e view. Once a default view has been changed, it is then saved by views and becomes overridden; you can also revert it to the default view. This brings up a good point: many modules hook into the views API, adding their own views that you can go in and override. A normal view is a view that has been added to the site through either the Add new view or Import view from code link. Type refers to the type of data the view is pulling, including Comment, Node, File, Node revision, Term, User, and more. Think of it as what you want to query; do you want to query nodes, files, or comments This value is entered when creating a view and cannot be changed afterward. It also changes many of the default settings available when creating a view; see the next two sections for details. Displays is how the view is being displayed in the site, which can be through a Block, a Page, and/or an RSS Feed. Note that all views are displayed through one of these three.

Now that we ve looked at the basic programming rules for the session beans, let s discuss the fundamental reasons behind splitting them into two groups.