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erences to components, and how components can call each other.
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EJB 3.0 defines how crosscutting concerns are handled, such as transactions and security. You can also write custom interceptors and wrap them around your components. EJB 3.0 standardizes Java Persistence and how you can access an SQL database with automatic and transparent object/relational mapping.
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If you want to access an SQL database, you create your domain model entity classes (such as Item, User, Category) and map them with annotations from the Java Persistence specification to a database schema. The EJB 3.0 persistence manager API, the EntityManager, is now your gateway for database operations. You execute database operations in EJB 3.0 components for example, stateful or stateless session beans. These beans are plain Java classes, which you enable as EJBs with a few annotations. You then get the container s services, such as automatic dependency injection (you get the EntityManager when you need it) and declarative transaction demarcation on component methods. Stateful session
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beans help you to keep state for a particular client, for example, if a user has to go through several pages in a conversation with the application. Can you use EJB 3.0 components and entities as backing beans for JSF actions and widgets Can you bind a JSF text field widget to a field in your Item entity class Can a JSF button-click be directly routed to a session bean method Let s try this with an example.
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17.1.3 Writing a web application with JSF and EJB 3.0
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The web application you ll create is simple; it has a search screen where users can enter an identifier for a particular item, and a detail screen that appears when the item is found in the database. On this detail screen, users can edit the item s data and save the changes to the database. (We don t think you should necessarily code this application while reading the examples; later, we make significant improvements by introducing Seam. That s the time to start coding.) Start with the data model for the entity: an Item. Creating the entity class and mapping The Item entity class comes from CaveatEmptor. It s also already annotated and mapped to the SQL database (listing 17.1).
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Listing 17.1 An annotated and mapped entity class
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package auction.model; import ...; @Entity @Table(name = "ITEM") public class Item implements Serializable { @Id @GeneratedValue @Column(name = "ITEM_ID") private Long id = null; @Column(name = "ITEM_NAME", length = 255, nullable = false, updatable = false) private String name; @ManyToOne(fetch = FetchType.LAZY) @JoinColumn(name="SELLER_ID", nullable = false, updatable = false) private User seller; @Column(name = "DESCRIPTION", length = 4000, nullable = false) private String description; @Column( name="INITIAL_PRICE", nullable = false)
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The Java EE 5.0 programming model
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private BigDecimal initialPrice; Item() {} // Getter and setter methods... }
This is a simplified version of the CaveatEmptor Item entity, without any collections. Next is the search page that allows users to search for item objects. Writing the search page with Facelets and JSF The search page of the application is a page written with Facelets as the templating engine, and it s valid XML. JSF widgets are embedded in that page to create the search form with its input fields and buttons (listing 17.2).
Listing 17.2 The search.xhtml page in XHTML with Facelets
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xmlns:ui="http://java.sun.com/jsf/facelets" xmlns:h="http://java.sun.com/jsf/html" xmlns:f="http://java.sun.com/jsf/core">
<head> <title>CaveatEmptor - Search items</title> <link href="screen.css" rel="stylesheet" type="text/css"/> </head> <body> <ui:include src="header.xhtml"/> <h:form> <span class="errors"><h:message for="itemSearchField"/></span> <div class="entry"> <div class="label">Enter item identifier:</div> <div class="input"> <h:inputText id="itemSearchField" size="3" required="true" value="#{itemEditor.itemId}"> <f:validateLongRange minimum="0"/> </h:inputText> </div> </div> <div class="entry">
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<div class="label"> </div> <div class="input"> <h:commandButton value="Search" styleClass="button" action="#{itemEditor.doSearch}"/> </div> </div> </h:form> </body> </html>
B C D E F G H I
Every valid XHTML file needs the right document type declaration. In addition to the regular XHTML namespace, you import the Facelets and two JSF namespaces for visual HTML components and core JSF components (for example, for input validation). The page layout is handled with cascading stylesheets (CSS) externalized to a separate file. A common page header template is imported with <ui:import> from Facelets. A JSF form (note the h namespace) is an HTML form that, if submitted, is processed by the JSF servlet.
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