Document Information


Part I Introduction

1.  Overview

2.  Using the Tutorial Examples

Part II The Web Tier

3.  Getting Started with Web Applications

4.  JavaServer Faces Technology

5.  Introduction to Facelets

6.  Expression Language

7.  Using JavaServer Faces Technology in Web Pages

8.  Using Converters, Listeners, and Validators

Using the Standard Converters

Converting a Component's Value

Using DateTimeConverter

Using NumberConverter

Using the Standard Validators

Validating a Component's Value

Using LongRangeValidator

Referencing a Managed Bean Method

Referencing a Method That Performs Navigation

Referencing a Method That Handles an Action Event

Referencing a Method That Performs Validation

Referencing a Method That Handles a Value-Change Event

9.  Developing with JavaServer Faces Technology

10.  JavaServer Faces Technology: Advanced Concepts

11.  Using Ajax with JavaServer Faces Technology

12.  Composite Components: Advanced Topics and Example

13.  Creating Custom UI Components and Other Custom Objects

14.  Configuring JavaServer Faces Applications

15.  Java Servlet Technology

16.  Uploading Files with Java Servlet Technology

17.  Internationalizing and Localizing Web Applications

Part III Web Services

18.  Introduction to Web Services

19.  Building Web Services with JAX-WS

20.  Building RESTful Web Services with JAX-RS

21.  JAX-RS: Advanced Topics and Example

Part IV Enterprise Beans

22.  Enterprise Beans

23.  Getting Started with Enterprise Beans

24.  Running the Enterprise Bean Examples

25.  A Message-Driven Bean Example

26.  Using the Embedded Enterprise Bean Container

27.  Using Asynchronous Method Invocation in Session Beans

Part V Contexts and Dependency Injection for the Java EE Platform

28.  Introduction to Contexts and Dependency Injection for the Java EE Platform

29.  Running the Basic Contexts and Dependency Injection Examples

30.  Contexts and Dependency Injection for the Java EE Platform: Advanced Topics

31.  Running the Advanced Contexts and Dependency Injection Examples

Part VI Persistence

32.  Introduction to the Java Persistence API

33.  Running the Persistence Examples

34.  The Java Persistence Query Language

35.  Using the Criteria API to Create Queries

36.  Creating and Using String-Based Criteria Queries

37.  Controlling Concurrent Access to Entity Data with Locking

38.  Using a Second-Level Cache with Java Persistence API Applications

Part VII Security

39.  Introduction to Security in the Java EE Platform

40.  Getting Started Securing Web Applications

41.  Getting Started Securing Enterprise Applications

42.  Java EE Security: Advanced Topics

Part VIII Java EE Supporting Technologies

43.  Introduction to Java EE Supporting Technologies

44.  Transactions

45.  Resources and Resource Adapters

46.  The Resource Adapter Example

47.  Java Message Service Concepts

48.  Java Message Service Examples

49.  Bean Validation: Advanced Topics

50.  Using Java EE Interceptors

Part IX Case Studies

51.  Duke's Bookstore Case Study Example

52.  Duke's Tutoring Case Study Example

53.  Duke's Forest Case Study Example



Registering Listeners on Components

An application developer can implement listeners as classes or as managed bean methods. If a listener is a managed bean method, the page author references the method from either the component’s valueChangeListener attribute or its actionListener attribute. If the listener is a class, the page author can reference the listener from either an f:valueChangeListener tag or an f:actionListener tag and nest the tag inside the component tag to register the listener on the component.

Referencing a Method That Handles an Action Event and Referencing a Method That Handles a Value-Change Event explain how a page author uses the valueChangeListener and actionListener attributes to reference managed bean methods that handle events.

This section explains how to register a NameChanged value-change listener and a BookChange action listener implementation on components. The Duke’s Bookstore case study includes both of these listeners.

Registering a Value-Change Listener on a Component

A page author can register a ValueChangeListener implementation on a component that implements EditableValueHolder by nesting an f:valueChangeListener tag within the component’s tag on the page. The f:valueChangeListener tag supports the attributes shown in Table 8-3, one of which must be used.

Table 8-3 Attributes for the f:valueChangeListener Tag




References the fully qualified class name of a ValueChangeListener implementation. Can accept a literal or a value expression.


References an object that implements ValueChangeListener. Can accept only a value expression, which must point to a managed bean property that accepts and returns a ValueChangeListener implementation.

The following example shows a value-change listener registered on a component:

<h:inputText id="name"
             requiredMessage="#{bundle.ReqCustomerName}" >
        type="dukesbookstore.listeners.NameChanged" />

In the example, the core tag type attribute specifies the custom NameChanged listener as the javax.faces.event.ValueChangeListener implementation registered on the name component.

After this component tag is processed and local values have been validated, its corresponding component instance will queue the javax.faces.event.ValueChangeEvent associated with the specified ValueChangeListener to the component.

The binding attribute is used to bind a ValueChangeListener implementation to a managed bean property. This attribute works in a similar way to the binding attribute supported by the standard converter tags. See Binding Component Values and Instances to Managed Bean Properties for more information.

Registering an Action Listener on a Component

A page author can register an javax.faces.event.ActionListener implementation on a command component by nesting an f:actionListener tag within the component’s tag on the page. Similarly to the f:valueChangeListener tag, the f:actionListener tag supports both the type and binding attributes. One of these attributes must be used to reference the action listener.

Here is an example of an h:commandLink tag that references an ActionListener implementation:

<h:commandLink id="Duke" action="bookstore">
        type="dukesbookstore.listeners.LinkBookChangeListener" />
    <h:outputText value="#{bundle.Book201}"/>

The type attribute of the f:actionListener tag specifies the fully qualified class name of the ActionListener implementation. Similarly to the f:valueChangeListener tag, the f:actionListener tag also supports the binding attribute. See Binding Converters, Listeners, and Validators to Managed Bean Properties for more information about binding listeners to managed bean properties.

In addition to the actionListener tag that allows you register a custom listener onto a component, the core tag library includes the f:setPropertyActionListener tag. You use this tag to register a special action listener onto the ActionSource instance associated with a component. When the component is activated, the listener will store the object referenced by the tag’s value attribute into the object referenced by the tag’s target attribute.

The bookcatalog.xhtml page of the Duke’s Bookstore application uses f:setPropertyActionListener with two components: the h:commandLink component used to link to the bookdetails.xhtml page and the h:commandButton component used to add a book to the cart:

<h:dataTable id="books"
    rowClasses="list-row-even, list-row-odd"
    summary="#{bundle.BookCatalog}" >
        <f:facet name="header">
            <h:outputText value="#{bundle.ItemTitle}"/>
        <h:commandLink action="#{catalog.details}"
            <f:setPropertyActionListener target="#{}" 
        <f:facet name="header">
            <h:outputText  value="#{bundle.CartAdd}"/>
        <h:commandButton id="add"
            <f:setPropertyActionListener target="#{}" 

The h:commandLink and h:commandButton tags are within an h:dataTable tag, which iterates over the list of books. The var attribute refers to a single book in the list of books.

The object referenced by the var attribute of an h:dataTable tag is in page scope. However, in this case, you need to put this object into request scope so that when the user activates the commandLink component to go to bookdetails.xhtml or activates the commandButton component to go to bookcatalog.xhtml, the book data is available to those pages. Therefore, the f:setPropertyActionListener tag is used to set the current book object into request scope when the commandLink or commandButton component is activated.

In the preceding example, the f:setPropertyActionListener tag’s value attribute references the book object. The f:setPropertyActionListener tag’s target attribute references the value expression, which is where the book object referenced by the value attribute is stored when the commandLink or the commandButton component is activated.