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Home > Programming > Application Development > Java EE 8 Application Development
Java EE 8 Application Development
Java EE 8 Application Development

Java EE 8 Application Development: Develop Enterprise applications using the latest versions of CDI, JAX-RS, JSON-B, JPA, Security, and more

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Java EE 8 Application Development

JavaServer Faces

In this chapter, we will cover JavaServer Faces (JSF), the standard component framework of the Java EE platform. Java EE 8 includes JSF 2.3, the latest version of JSF. JSF relies a lot on convention over configuration—if we follow JSF conventions then we don't need to write a lot of configuration. In most cases, we don't need to write any configuration at all. This fact, combined with the fact that web.xml has been optional since Java EE 6, means that, in many cases, we can write complete web applications without having to write a single line of XML.

We will cover the following topics in this chapter:

  • Facelets
  • JSF project stages
  • Data validation
  • Named beans
  • Navigation
  • Ajax-enabling JSF applications
  • JSF HTML5 support
  • Faces flows
  • JSF artifact injection
  • JSF WebSocket support
  • JSF component libraries

Introducing JSF

JSF 2.0 introduced a number of enhancements to make JSF application development easier. In the following few sections, we will explore some of these features.

Readers not familiar with earlier versions of JSF may not understand the following few sections completely. Not to worry, everything will be perfectly clear by the end of this chapter.

Facelets

One notable difference between modern versions of JSF and earlier versions is that Facelets is now the preferred view technology. Earlier versions of JSF used Java Server Pages (JSP) as their default view technology. Since the JSP technology predates JSF, sometimes using JSP with JSF felt unnatural or created problems. For example, the JSP lifecycle is different...

Developing our first JSF application

To illustrate basic JSF concepts, we will develop a simple application consisting of two Facelet pages and a single CDI named bean.

Facelets

As we mentioned in this chapter's introduction, the default view technology for JSF 2.0 and newer versions is Facelets. Facelets need to be written using standard XML. The most popular way to develop Facelet pages is to use XHTML in conjunction with JSF-specific XML namespaces. The following example shows how a typical Facelet page looks:

<?xml version='1.0' encoding='UTF-8' ?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
 "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd&quot...

Custom data validation

In addition to providing standard validators for our use, JSF allows us to create custom validators. This can be done in one of two ways—by creating a custom validator class or by adding validation methods to our named beans.

Creating custom validators

In addition to the standard validators, JSF allows us to create custom validators by creating a Java class implementing the javax.faces.validator.Validator interface.

The following class implements an email validator, which we will use to validate the email text input field in our customer data entry screen:

package net.ensode.glassfishbook.jsfcustomval; 
 
import javax.faces.application.FacesMessage; 
import javax.faces.component.UIComponent; ...

Ajax-enabling JSF applications

JSF allows us to easily implement Ajax (Asynchronous JavaScript and XML) functionality into our web applications by simply employing the <f:ajax> tag and CDI named beans, without needing to implement any JavaScript code or having to parse JSON strings to implement Ajax with JSF.

The following illustrates a typical usage of the <f:ajax> tag:

<?xml version='1.0' encoding='UTF-8' ?> 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
<html xmlns="http://www.w3.org/1999/xhtml" 
      xmlns:h="http://java.sun.com/jsf/html" 
      xmlns:f="http://java.sun.com/jsf/core"> 
  <h:head> 
    <title>JSF Ajax Demo</title> 
  </h:head> 
  <h:body> 
    <h2>JSF Ajax Demo</h2> 
    <h:form> 
      <h:messages/> 
      <h:panelGrid columns="2"> 
 
        <h:outputText value="Echo input:"/> 
        <h:inputText...

JSF HTML5 support

HTML5 is the latest version of the HTML specification and includes several improvements over the previous version of HTML. Modern versions of JSF include several features to make JSF pages work nicely with HTML5.

HTML5-friendly markup

Through the use of pass-through elements, we can develop our pages using HTML5 and also treat them as JSF components. To do this, we need to specify at least one element attributes using http://xmlns.jcp.org/jsf namespace. The following example demonstrates this approach in action:

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml"
xmlns:jsf="http://xmlns.jcp.org/jsf">
    <head jsf:id="head">
        <title>JSF Page with HTML5 Markup</title>
        <link jsf:library="css" jsf:name="styles.css" rel="stylesheet"
         type="text/css" href="resources/css/styles.css"/>
    </head>
 <body jsf:id="body">
        <form jsf:prependId="false">
            <table style="border-spacing...

JSF 2.2 Faces flows

JSF 2.2 introduced Faces flows, which defines a scope that can span several pages. Flow scoped beans are created when the user enters a flow (a set of web pages), and are destroyed when the user leaves the flow.

Faces flows adopts the convention over configuration principle of JSF. The following conventions are typically used when developing applications employing faces flows:

  • All pages in the flow must be placed in a directory whose name defines the name of the flow
  • An XML configuration file named after the directory name, and suffixed with -flow, must exist inside the directory that contains the pages in the flow (the file may be empty, but it must exist)
  • The first page in the flow must be named after the directory name that contains the flow
  • The last page in the flow must not be located inside the directory containing the flow and must be named after the directory name and suffixed with -return

The following screenshot illustrates these conventions:

In the preceding example...

Injecting JSF artifacts

The JSF specification predates CDI. As such, many JSF artifacts, such as FacesContext and ExternalContext, had to be obtained via static entry methods; this resulted in hard-to-read boilerplate code. JSF 2.3 introduces the ability to inject JSF artifacts via CDI's @Inject annotation, as seen in the following example:

package net.ensode.javaee8book.jsfarbitrarymess; 
 
import java.io.Serializable; 
import javax.faces.application.FacesMessage; 
import javax.faces.context.FacesContext; 
import javax.faces.view.ViewScoped; 
import javax.inject.Inject; 
import javax.inject.Named; 
 
@Named 
@ViewScoped 
public class ArbitraryMessageController implements Serializable { 
 
    @Inject
    FacesContext facesContext; 
 
    public void saveData() { 
        FacesMessage facesMessage = new  
         FacesMessage(FacesMessage.SEVERITY_INFO, 
         "Data saved successfully", "All Data successfully  
          saved."); 
        facesContext.addMessage(null, facesMessage);...

JSF WebSocket support

In typical web applications, servers always respond to requests from a browser; there is no way for a server to send data to the client browser without responding to a request. WebSocket technology provides full duplex communication between a browser and a server, allowing servers to independently send data to a client, without having to respond to a request. WebSocket technology allows a myriad of new applications to be developed for the web, including updating stock tickers, multiplayer online games, and chat applications.

Note

Although some of these types of web applications were developed before the advent of WebSockets, they relied on hacks to work around the limitations of the HTTP protocol. With WebSockets, these hacks are no longer necessary.

Traditionally, writing applications taking advantage of the WebSocket protocol required a lot of JavaScript code. JSF 2.3 introduces WebSocket support and abstracts out most of the JavaScript plumbing, allowing us to focus...

Additional JSF component libraries

In addition to the standard JSF component libraries, there are a number of third-party JSF tag libraries available. The following table lists some of the most popular:

Tag library

Distributor

License

URL

ICEfaces

ICEsoft

MPL 1.1

http://www.icefaces.org

RichFaces

Red Hat/JBoss

LGPL

http://www.jboss.org/richfaces

Primefaces

Prime Technology

Apache 2.0

http://www.primefaces.org

Summary

In this chapter, we covered how to develop web-based applications using JavaServer Faces, the standard component framework for the Java EE platform. We looked at how to write a simple application by creating pages using Facelets as the view technology and CDI named beans. We also covered how to validate user input by using JSF's standard validators, by creating our own custom validators or by writing validator methods. Additionally, we covered how to customize standard JSF error messages, both the message text and the message style (font, color, and such). Also, we covered how to develop Ajax-enabled JSF pages, as well as how to integrate JSF and HTML5.

Summary

In this chapter, we covered how to develop web-based applications using JavaServer Faces, the standard component framework for the Java EE platform. We looked at how to write a simple application by creating pages using Facelets as the view technology and CDI named beans. We also covered how to validate user input by using JSF's standard validators, by creating our own custom validators or by writing validator methods. Additionally, we covered how to customize standard JSF error messages, both the message text and the message style (font, color, and such). Also, we covered how to develop Ajax-enabled JSF pages, as well as how to integrate JSF and HTML5.

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Key benefits

  • Covers all of the major Java EE 8 APIs and includes new additions such as enhanced Security, JSON-B Processing, and more
  • Learn additional Java EE APIs, such as the Java API for Websocket and the Java Message Service (JMS)
  • Develop applications by taking advantage of the latest versions of CDI, Security, Servlets, and JSF and other Java EE specifications

Description

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.

Who is this book for?

If you are a Java developer who wants to become proficient with Java EE 8, this book is ideal for you. You are expected to have some experience with Java and to have developed and deployed applications in the past, but you don't need any previous knowledge of Java EE.

What you will learn

  • Develop and deploy Java EE applications
  • Embrace the latest additions to the Contexts and Dependency Injection (CDI) specification to develop Java EE applications
  • Develop web-based applications by utilizing the latest version of JavaServer Faces, JSF 2.3.
  • Understand the steps needed to process JSON data with JSON-P and the new JSON-B Java EE API
  • Implement RESTful web services using the new JAX-RS 2.1 API, which also includes support for Server-Sent Events (SSE) and the new reactive client API

Product Details

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Publication date, Length, Edition, Language, ISBN-13
Publication date : Dec 12, 2017
Length: 372 pages
Edition : 1st
Language : English
ISBN-13 : 9781788297332
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Category :
Programming
Languages :
Java
Concepts :
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Tools :
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Publication date : Dec 12, 2017
Length: 372 pages
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Language : English
ISBN-13 : 9781788297332
Vendor :
Oracle
Category :
Programming
Languages :
Java
Concepts :
Application Development
Tools :
Java EE

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Table of Contents

14 Chapters
Introduction to Java EE Chevron down icon Chevron up icon
Introduction to Java EE
Introduction to Java EE
One standard, multiple implementations
Java EE, J2EE, and the Spring framework
Summary
JavaServer Faces Chevron down icon Chevron up icon
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
Object Relational Mapping with the Java Persistence API Chevron down icon Chevron up icon
Object Relational Mapping with the Java Persistence API
The Customer database
The Java Persistence API
Final notes
Summary
Enterprise JavaBeans Chevron down icon Chevron up icon
Enterprise JavaBeans
Session beans
Asynchronous method calls
Message-driven beans
Transactions in enterprise JavaBeans
Enterprise JavaBean life cycles
EJB timer service
EJB security
Summary
Contexts and Dependency Injection Chevron down icon Chevron up icon
Contexts and Dependency Injection
Named beans
Dependency injection
Qualifiers
Named bean scopes
CDI events
Summary
JSON Processing with JSON-P and JSON-B Chevron down icon Chevron up icon
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
WebSocket Chevron down icon Chevron up icon
WebSocket
Developing a WebSocket server endpoint
Developing WebSocket clients
Additional information about the Java API for WebSocket
Summary
Java Messaging Service Chevron down icon Chevron up icon
Java Messaging Service
Message queues
Message topics
Summary
Securing Java EE Applications Chevron down icon Chevron up icon
Securing Java EE Applications
Identity stores
Authentication mechanisms
Summary
RESTful Web Services with JAX-RS Chevron down icon Chevron up icon
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
Microservices Development with Java EE Chevron down icon Chevron up icon
Microservices Development with Java EE
Introduction to microservices
Microservices and Java EE
Developing microservices using Java EE
Summary
Web Services with JAX-WS Chevron down icon Chevron up icon
Web Services with JAX-WS
Developing web services with JAX-WS
Exposing EJBs as web services
Summary
Servlet Development and Deployment Chevron down icon Chevron up icon
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
Configuring and Deploying to GlassFish Chevron down icon Chevron up icon
Configuring and Deploying to GlassFish
Obtaining GlassFish
Installing GlassFish
Starting GlassFish
GlassFish domains
Setting up database connectivity
Setting JMS resources
Summary

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Paulo Diaz Dec 01, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Excelente libro de Aplicaciones basadas en Java para EE
Amazon Verified review Amazon
eva Feb 18, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Es un libro muy completo de Java ee 8. Contiene toda la información que se puede necesitar. Un acierto comprarlo
Amazon Verified review Amazon
Texashowdy Apr 21, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Good summary of the Java EE landscape. The book is a good resource for experienced architects. Examples are focussed and small
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brosnan Jul 06, 2020
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Por lo menos lo recibí, demoro un poco pero estoy feliz por ahora tener mi artículo que pedí.
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Elder Moraes Mar 14, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
As usual, David did again a great job on this book. It shows a lot of working code exploring deep details of Java EE 8 API's and also giving plenty concepts that will help you understand its basis.If you are a Java EE developer or want to become one, this book is surely a must.
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About the author

Profile icon David R. Heffelfinger
David R. Heffelfinger
David R. Heffelfinger is an independent consultant based in the Washington D.C. area. He is a Java Champion, a member of the NetBeans Dream Team, and is a part of the JavaOne content committee. He has written several books on Java EE, application servers, NetBeans, and JasperReports. His previous titles include Java EE 7 Development with NetBeans 8, Java EE 7 with GlassFish 4 Application Server, and JasperReports 3.5 For Java Developers, and others. David has been a speaker at software conferences such as JavaOne and Oracle Code on multiple occasions. He has also been a speaker at NetBeans Day in San Francisco and Montreal, showcasing NetBeans features that greatly enhance the development of Java EE applications. You can follow him on Twitter at @ensode.
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