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@Logger Log log; public String continueToNextPage() { log.info("User name - #{userName}"); return "/pageTwo.jsp"; } }

One of the decisions an application designer has to make when approaching EJB entity classes is whether to design them top-down or bottom-up that is, whether to first create the entities and let the database schema follow, or whether to create the database schema first. It is of course possible to build both entities and tables in parallel, but in many cases, one or the other of these objects is fixed, and the other must be built to match.

After you upload photos, you can rearrange them into whatever order you like. To do so, select the photo album, and click the Organize Photo option, shown in Figure 4-32.

In the top-down model, the entity class serves as the source of truth, and the database schema is created to provide persistence for the entity class data. The underlying table(s) can be generated as a side effect of deploying the entity class; you may wish to specify metadata in @Table, @Column, and related annotations to guide the deployment tool in generating the structure of the schema.

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Now that you have seen the Session context examples, you should appreciate how easy and unobtrusive it is to set the Session context. It is also worthy to note that in the portal environment, the POJOs that you annotate as a Session context will represent the portlet session as defined in JSR 168. A best practice to remember when using the Session context is that you should use this context only with something that is truly session specific. Although this may seem an obvious comment, you will often find with normal web applications that people fall into the pattern of using the session too often. This is mainly due to needing an object to persist longer than a single request but shorter than an entire session. With Seam, however, because we have many other contexts that give us much more fine-grained control, such as the Conversation context, you will probably not need to use this cheat. So think carefully when using a Session context when creating your Seam-based application.

Figure 4-32. The Organize Photos option To rearrange photos, roll the mouse pointer over the desired photo; an arrow icon appears. See Figure 4-33.

In the bottom-up approach, the database schema is the source of truth: the schema is fixed, and the Java objects entity classes exist to adapt the database objects into the Java world. This process, typically provided through an IDE using an EJB reverse engineering tool, generates a default entity class for each table and a default field for each column.

As I mentioned in 5, the Application context is like the Servlet context used by the Servlet specification. The Servlet context is where you store static type data that is not differentiable for multiple users. Listing 6-5 creates a class that will be used to retrieve static content.

Both approaches are equally common in real-world development projects. Your needs will dictate which tools you will want to use to glue the database to the entity beans. You may think of the issue as one of persistence vs. adaption: does the database schema exist solely to provide persistence for the entity beans, or are you adapting the database schema into the Java space Consider this question when you begin to create your entity beans.

Figure 4-33. Selecting a photo to rearrange You can click and drag the photo into a different position, as shown in Figure 4-34.

In the CustomerOrderManager example, we show how a session bean may serve as a fa ade for a handful of entities. Our CustomerOrderManager session bean exposes CRUD (create, retrieve, update, delete) operations as service methods, allowing clients to access and manipulate Customer, CustomerOrder, and Address entities. These service methods on the session fa ade provide transaction, access control, and other enterprise-level services, and allow the persistence framework to handle the interface between the Java data objects (entities) and the underlying RDBMS.

@Name("configurationData") @Scope(ScopeType.APPLICATION) public class ConfigurationData implements Serializable { // ... content goes here ... }

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