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

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

Annotations for Field and Bean Properties of Resource Classes

Extracting Path Parameters

Extracting Query Parameters

Extracting Form Data

Extracting the Java Type of a Request or Response

Subresources and Runtime Resource Resolution

Subresource Methods

Subresource Locators

Integrating JAX-RS with EJB Technology and CDI

Runtime Content Negotiation

Using JAX-RS With JAXB

Using Java Objects to Model Your Data

Starting from an Existing XML Schema Definition

Using JSON with JAX-RS and JAXB

The customer Example Application

Overview of the customer Example Application

The Customer and Address Entity Classes

The CustomerService Class

The CustomerClientXML and CustomerClientJSON Classes

Modifying the Example to Generate Entity Classes from an Existing Schema

To Modify the customer Example to Generate Java Entity Classes from an Existing XML Schema Definition

Running the customer Example

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

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

To Run the customer Example Using the Jersey Client

To Run the customer Example Using the Web Services Tester

Using Curl to Run the customer Example Application

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



Conditional HTTP Requests

JAX-RS provides support for conditional GET and PUT HTTP requests. Conditional GET requests help save bandwidth by improving the efficiency of client processing.

A GET request can return a Not Modified (304) response if the representation has not changed since the previous request. For example, a web site can return 304 responses for all its static images that have not changed since the previous request.

A PUT request can return a Precondition Failed (412) response if the representation has been modified since the last request. The conditional PUT can help avoid the lost update problem.

Conditional HTTP requests can be used with the Last-Modified and ETag headers. The Last-Modified header can represent dates with granularity of one second.

public class Employee {

    Date joiningdate;
    public Employee(@PathParam("joiningdate") Date joiningdate, 
            @Context Request req, 
            @Context UriInfo ui) {

        this.joiningdate = joiningdate;
        this.tag = computeEntityTag(ui.getRequestUri());
        if (req.getMethod().equals("GET")) {
            Response.ResponseBuilder rb = req.evaluatePreconditions(tag);
            if (rb != null) {
                throw new WebApplicationException(;

In this code snippet, the constructor of the Employee class computes the entity tag from the request URI and calls the request.evaluatePreconditions method with that tag. If a client request returns an If-none-match header with a value that has the same entity tag that was computed, evaluate.Preconditions returns a pre-filled-out response with a 304 status code and an entity tag set that may be built and returned.