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.

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Table of Contents (21 chapters)
Title Page
Title Page
Credits
Credits
About the Author
About the Author
About the Reviewers
About the Reviewers
www.PacktPub.com
www.PacktPub.com
Customer Feedback
Customer Feedback
Preface
Preface
Free Chapter
1
Introduction to Java EE
Introduction to Java EE
Introduction to Java EE
One standard, multiple implementations
Java EE, J2EE, and the Spring framework
Summary
2
JavaServer Faces
JavaServer Faces
Introducing JSF
Developing our first JSF application
Custom data validation
Customizing JSF's default messages
Ajax-enabling JSF applications
JSF HTML5 support
JSF 2.2 Faces flows
Injecting JSF artifacts
JSF WebSocket support
Additional JSF component libraries
Summary
3
Object Relational Mapping with the Java Persistence API
Object Relational Mapping with the Java Persistence API
The Customer database
The Java Persistence API
Final notes
Summary
4
Enterprise JavaBeans
Enterprise JavaBeans
Session beans
Asynchronous method calls
Message-driven beans
Transactions in enterprise JavaBeans
Enterprise JavaBean life cycles
EJB timer service
EJB security
Summary
5
Contexts and Dependency Injection
Contexts and Dependency Injection
Named beans
Dependency injection
Qualifiers
Named bean scopes
CDI events
Summary
6
JSON Processing with JSON-P and JSON-B
JSON Processing with JSON-P and JSON-B
The JSON-P Model API
The JSON-P Streaming API
JSON pointer
JSON Patch
Populating Java objects from JSON with JSON-B
Generating JSON strings from Java objects with JSON-B
Summary
7
WebSocket
WebSocket
Developing a WebSocket server endpoint
Developing WebSocket clients
Additional information about the Java API for WebSocket
Summary
8
Java Messaging Service
Java Messaging Service
Message queues
Message topics
Summary
9
Securing Java EE Applications
Securing Java EE Applications
Identity stores
Authentication mechanisms
Summary
10
RESTful Web Services with JAX-RS
RESTful Web Services with JAX-RS
An introduction to RESTful web services and JAX-RS
Developing a simple RESTful web service
Developing a RESTful web service client
Query and path parameters
Server-sent events
Summary
11
Microservices Development with Java EE
Microservices Development with Java EE
Introduction to microservices
Microservices and Java EE
Developing microservices using Java EE
Summary
12
Web Services with JAX-WS
Web Services with JAX-WS
Developing web services with JAX-WS
Exposing EJBs as web services
Summary
13
Servlet Development and Deployment
Servlet Development and Deployment
What is a servlet?
Request forwarding and response redirection
Persisting application data across requests
Passing initialization parameters to a servlet via annotations
Servlet filters
Servlet listeners
Pluggability
Configuring web applications programmatically
Asynchronous processing
HTTP/2 server push support
Summary
14
Configuring and Deploying to GlassFish
Configuring and Deploying to GlassFish
Obtaining GlassFish
Installing GlassFish
Starting GlassFish
GlassFish domains
Setting up database connectivity
Setting JMS resources
Summary

Server-sent events

Typically, every interaction between a web service and its client is initiated by the client; the client sends a request (GET, POST, PUT, or DELETE), then receives a response from the server. Server-sent events technology allows RESTful web services to "take the initiative" to send messages to a client, that is, to send data that is not a response to a client request. Server-sent events are useful for sending data continuously to a client, for applications such as stock tickers, news feeds, sports scores, and so on.

JAX-RS 2.1 introduces server-sent event support. The following example illustrates how to implement this functionality into our JAX-RS RESTful web services:

package net.ensode.javaee8book.jaxrs21sse; 
 
import java.util.List; 
import java.util.concurrent.Executor; 
import java.util.concurrent.Executors; 
import java.util.concurrent.TimeUnit; 
import java.util.stream.Collectors; 
import java.util.stream.Stream; 
import javax.ws.rs.GET; 
import javax.ws.rs.Path...
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