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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.

The <path> datatype resolves all relative items to their absolute paths and converts all file and path separators to the local platform, and so the result is

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).

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)

Dereferencing properties Makefile experts, and others desiring tricky variable dereferencing may be disappointed to find that Ant does not have advanced evaluation of properties. They are simply string substitutions and nesting properties does not accomplish what some may expect. For example

private BigDecimal initialPrice; Item() {} // Getter and setter methods... }

<property <property <property <property name="X" name="Y" name="A" name="B" value="Y"/> value="Z"/> value="${${X}}"/> value="$${${X}}"/>

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).

[echo] A = ${${X}} [echo] B = ${Y}

<!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">

It is possible, however, to accomplish this, though rarely, if ever, would this particular technique be needed in a build file. Make has a feature called computed variable names, which is similar to our first attempts at dereferencing, yet with different results. (In other words, A would have equaled Z.) Using an additional property is required as a selector:

<div class="label"> </div> <div class="input"> <h:commandButton value="Search" styleClass="button" action="#{itemEditor.doSearch}"/> </div> </div> </h:form> </body> </html>

<property name="X" value="Y" id="X.prop"/> <property name="Y" value="Z" id="Y.prop"/> <property name="selector" value="${X}"/> <property name="A" refid="${selector}.prop"/> <echo message="A = ${A}"/>

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.

While this appears fairly straightforward, it is actually taking advantage of some fairly complex capability of Ant, that of assigning an id to a task (in this case <property>). The value of selector becomes Y, and the assignment of A uses the value of the referenced object (in this case a task) by the name of Y.prop. Avoid this kind of wackiness at almost all costs because there are much more standard and clearer ways to choose a different set of properties, such as