Book Image

Mastering Java EE Development with WildFly

By : Luca Stancapiano
Book Image

Mastering Java EE Development with WildFly

By: Luca Stancapiano

Overview of this book

Packed with rich assets and APIs, Wildfly 10 allows you to create state-of-the-art Java applications. This book will help you take your understanding of Java EE to the next level by creating distributed Java applications using Wildfly. The book begins by showing how to get started with a native installation of WildFly and it ends with a cloud installation. After setting up the development environment, you will implement and work with different WildFly features, such as implementing JavaServer Pages. You will also learn how you can use clustering so that your apps can handle a high volume of data traffic. You will also work with enterprise JavaBeans, solve issues related to failover, and implement Java Message Service integration. Moving ahead, you will be working with Java Naming and Directory Interface, Java Transaction API, and use ActiveMQ for message relay and message querying. This book will also show you how you can use your existing backend JavaScript code in your application. By the end of the book, you’ll have gained the knowledge to implement the latest Wildfly features in your Java applications.
Table of Contents (20 chapters)
5
Working with Distributed Transactions
16
WildFly in Cloud

Protocol handler

In Chapter 7, Implementing WebSockets, in the Negotiated subprotocols section, we introduced the multiprotocol function. With this function, we can establish what protocol to use for the client-server communication, and even use of a custom protocol to use in secure system, for example.
Servlets 3.1 introduce the javax.servlet.http.HttpUpgradeHandler interface. This interface encapsulates the upgrade protocol processing. The upgrade protocol allows us to switch from the HTTP base protocol to another new protocol.
In the following example, we will call a servlet accepting an header, and it will upgrade the current HTTP base protocol to a custom echo protocol. This is the servlet implementation:

@WebServlet(urlPatterns = { "/UpgradeServlet" })
public class UpgradeServlet extends HttpServlet {
...
protected void doGet(HttpServletRequest request, HttpServletResponse...