Book Image

Apache Axis2 Web Services, 2nd Edition

By : Deepal Jayasinghe, Afkham Azeez
Book Image

Apache Axis2 Web Services, 2nd Edition

By: Deepal Jayasinghe, Afkham Azeez

Overview of this book

<p>Web services are gaining popularity and have become one of the major techniques for application integration. Due to the flexibility and advantages of using web services, you want to enable Web service support to your applications. This book is your gateway to learning all you need to know about the Apache Axis2 web service framework and its hands on implementation. <br /><br />Apache Axis2 Web Services, 2nd Edition is your comprehensive guide to implementing this incredibly powerful framework in practice. It gives you precisely what you need to know to develop a detailed practical understanding of this popular, modular and reliable web service framework.<br /><br />This book starts with a short and relevant introduction about the Axis2 1.5 framework and then plunges you straight into its architectural model.</p> <p>Learn to use and develop your own modules. Write a services.xml file so efficiently that you'll be creating more complex applications (rather than just POJOs) in no time.</p> <p>Learn how straightforward it really is to turn a Java class into a web service in Axis2. Experiment with different types of sessions in Axis2. Learn different patterns of Enterprise deployment. Ensure reliability in your web service - a major concern in most enterprise applications - with minimum impact on performance.<br /><br />This book will journey you through all this and more, giving you exactly what you need to learn Axis2 1.5 in the easiest way possible and create secure, reliable, and easy-to-use web services efficiently and systematically.</p>
Table of Contents (22 chapters)
Apache Axis2 Web Services
Credits
About the Authors
About the Reviewers
www.PacktPub.com
Preface
15
Building a Secure Reliable Web Service
Index

JSR 250 (Common Annotations)


In this section, we will be looking at some of the useful annotations introduced in the JSR 250 (Common Annotations) specification. We will be looking into the following annotations:

  • javax.annotation.Resource

  • javax.annotation.PostConstruct

  • javax.annotation.PreDestroy

javax.annotation.Resource

This annotation is used to mark a WebServiceContext resource that is needed by a web service. It is applied to a field or a method for JAX-WS endpoints. The container will inject an instance of the WebServiceContext resource into the endpoint implementation when it is initialized. This annotation is illustrated in the following example:

@WebService
public class HelloImpl {
    @Resource
    private WebServiceContext context;

    public String echo(String name) {
     ...
    }
}

javax.annotation.PostConstruct

This annotation is used on a method that needs to be executed after a dependency injection is done to perform any initialization. This method must be invoked before...