Book Image

Java EE 8 Application Development

Book Image

Java EE 8 Application Development

Overview of this book

Java EE is an Enterprise Java standard. Applications written to comply with the Java EE specification do not tie developers to a specific vendor; instead they can be deployed to any Java EE compliant application server. With this book, you’ll get all the tools and techniques you need to build robust and scalable applications in Java EE 8. This book covers all the major Java EE 8 APIs including JSF 2.3, Enterprise JavaBeans (EJB) 3.2, Contexts and Dependency Injection (CDI) 2.0, the Java API for WebSockets, JAX-RS 2.1, Servlet 4.0, and more. The book begins by introducing you to Java EE 8 application development and goes on to cover all the major Java EE 8 APIs. It goes beyond the basics to develop Java EE applications that can be deployed to any Java EE 8 compliant application server. It also introduces advanced topics such as JSON-P and JSON-B, the Java APIs for JSON processing, and the Java API for JSON binding. These topics dive deep, explaining how the two APIs (the Model API and the Streaming API) are used to process JSON data. Moving on, we cover additional Java EE APIs, such as the Java API for Websocket and the Java Message Service (JMS), which allows loosely coupled, asynchronous communication. Further on, you’ll discover ways to secure Java EE applications by taking advantage of the new Java EE Security API. Finally, you’ll learn more about the RESTful web service development using the latest JAX-RS 2.1 specification. You’ll also get to know techniques to develop cloud-ready microservices in Java EE.
Table of Contents (21 chapters)
Title Page
Credits
About the Author
About the Reviewers
www.PacktPub.com
Customer Feedback
Preface

Populating Java objects from JSON with JSON-B


A common programming task is to populate Java objects from JSON strings. It is such a common tasks that several libraries have been created to transparently populate Java objects from JSON, freeing application developers from having to manually code this functionality. There are some non-standard Java libraries that accomplish this task, such as Jackson (https://github.com/FasterXML/jackson), JSON-simple (https://github.com/fangyidong/json-simple), and Gson (https://github.com/google/gson). Java EE 8 introduces a new API providing this functionality, namely the Java API for JSON Binding (JSON-B). In this section, we will cover how to transparently populate a Java object from a JSON string.

The following example shows a RESTful web service written using the Java API for RESTful Web Services (JAX-RS). The service responds to HTTP POST requests in its addCustomer() method. This method takes a String as a parameter and this string is expected to contain...