Document Information

Preface

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

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

The encoder Example: Using Alternatives

The Coder Interface and Implementations

The encoder Facelets Page and Managed Bean

Running the encoder Example

To Build, Package, and Deploy the encoder Example Using NetBeans IDE

To Run the encoder Example Using NetBeans IDE

To Build, Package, and Deploy the encoder Example Using Ant

To Run the encoder Example Using Ant

The producermethods Example: Using a Producer Method To Choose a Bean Implementation

Components of the producermethods Example

Running the producermethods Example

To Build, Package, and Deploy the producermethods Example Using NetBeans IDE

To Build, Package, and Deploy the producermethods Example Using Ant

To Run the producermethods Example

The producerfields Example: Using Producer Fields to Generate Resources

The Producer Field for the producerfields Example

The producerfields Entity and Session Bean

The producerfields Facelets Pages and Managed Bean

Running the producerfields Example

To Build, Package, and Deploy the producerfields Example Using NetBeans IDE

To Build, Package, and Deploy the producerfields Example Using Ant

To Run the producerfields Example

The billpayment Example: Using Events and Interceptors

The PaymentEvent Event Class

The PaymentHandler Event Listener

The billpayment Facelets Pages and Managed Bean

The LoggedInterceptor Interceptor Class

Running the billpayment Example

To Build, Package, and Deploy the billpayment Example Using NetBeans IDE

To Build, Package, and Deploy the billpayment Example Using Ant

To Run the billpayment Example

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

Index

 

The decorators Example: Decorating a Bean

The decorators example, which is yet another variation on the encoder example, shows how to use a decorator to implement additional business logic for a bean. Instead of having the user choose between two alternative implementations of an interface at deployment time or runtime, a decorator adds some additional logic to a single implementation of the interface.

The example includes an interface, an implementation of it, a decorator, an interceptor, a managed bean, a Facelets page, and configuration files.

Components of the decorators Example

The decorators example is very similar to the encoder example described in The encoder Example: Using Alternatives. Instead of providing two implementations of the Coder interface, however, this example provides only the CoderImpl class. The decorator class, CoderDecorator, rather than simply return the coded string, displays the input and output strings’ values and length.

The CoderDecorator class, like CoderImpl, implements the business method of the Coder interface, codeString:

@Decorator
public abstract class CoderDecorator implements Coder {

    @Inject
    @Delegate
    @Any
    Coder coder;

    @Override
    public String codeString(String s, int tval) {
        int len = s.length();

        return "\"" + s + "\" becomes " + "\"" + coder.codeString(s, tval) 
                + "\", " + len + " characters in length";
    }
}

The decorator’s codeString method calls the delegate object’s codeString method to perform the actual encoding.

The decorators example includes the Logged interceptor binding and LoggedInterceptor class from the billpayment example. For this example, the interceptor is set on the CoderBean.encodeString method and the CoderImpl.codeString method. The interceptor code is unchanged; interceptors are usually reusable for different applications.

Except for the interceptor annotations, the CoderBean and CoderImpl classes are identical to the versions in the encoder example.

The beans.xml file specifies both the decorator and the interceptor:

    <decorators>
        <class>decorators.CoderDecorator</class>
    </decorators>
    <interceptors>
        <class>decorators.LoggedInterceptor</class>
    </interceptors>

Running the decorators Example

You can use either NetBeans IDE or Ant to build, package, deploy, and run the decorators application.

To Build, Package, and Deploy the decorators Example Using NetBeans IDE

  1. From the File menu, choose Open Project.
  2. In the Open Project dialog, navigate to:
    tut-install/examples/cdi/
  3. Select the decorators folder.
  4. Select the Open as Main Project check box.
  5. Click Open Project.
  6. In the Projects tab, right-click the decorators project and select Deploy.

To Build, Package, and Deploy the decorators Example Using Ant

  1. In a terminal window, go to:
    tut-install/examples/cdi/decorators/
  2. Type the following command:
    ant

    This command calls the default target, which builds and packages the application into a WAR file, decorators.war, located in the dist directory.

  3. Type the following command:
    ant deploy

To Run the decorators Example

  1. In a web browser, type the following URL:
    http://localhost:8080/decorators

    The Decorated String Encoder page opens.

  2. Type a string and the number of letters to shift by, then click Encode.

    The output from the decorator method appears in blue on the Result line. For example, if you typed Java and 4, you would see the following:

    "Java" becomes "Neze", 4 characters in length
  3. Examine the server log output.

    In NetBeans IDE, the output is visible in the GlassFish Server 3+ output window. Otherwise, view domain-dir/logs/server.log.

    The output from the interceptors appears:

    INFO: Entering method: encodeString in class decorators.CoderBean
    INFO: Entering method: codeString in class decorators.CoderImpl