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Mastering Java EE Development with WildFly
Mastering Java EE Development with WildFly

Mastering Java EE Development with WildFly: Create Enterprise-grade Java applications with WildFly

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Mastering Java EE Development with WildFly

Working with Dependency Injection

Dependency injection is a very important design principle for working simply and at the same time with major security. It lets us write a very simple code to test. Java uses this principle since Java EE 5 through the CDI specifications.

The first Java frameworks to host this technology were the following:

  • Seam: Firstly, it was a set of utilities to work better with web applications. Next, it was discontinued and integrated in the Java EE 5 specifications; now it represents the main standard that a developer must use.
  • Spring: This was the first Java dependency injection framework born exclusively for complex Java applications. Now it is an evolved set of plugins where you can build anything through dependency injection. It remains an alternative to Java EE.

Contexts and Dependency Injection (CDI) is a set of annotations and services that make...

Dependency injection 1.0 for Java

This specification is provided by the javax.inject API. This is a set of packages specifying a means of getting objects in such a way as to achieve major reusability, testability, and maintainability compared to traditional approaches such as constructors, factories, and service locators. This process, known as dependency injection, is beneficial to most non-trivial applications.

With CDI, you don't instantiate the classes. CDI takes care of it. An internal management of the instances lets the developer create better features for the application. Instances are a point of work where we resolve performance problems. All this becomes simpler using a CDI engine.

Take, for example, a book service:

class BookService {
final List<Book> books;
BookService () {
books = new ArrayList(...);
}
}

Using the new construct, we are adding...

Context and dependency injection 1.1 for Java

This includes advanced SPI interfaces and annotations for CDI development.

Injection and contexts

When we inject a bean, we participate in a context. The context is declared in the CDI specifications as an environment based on the scope. The scope represents how the instances are registered and the type of visibility. If a bean is part of a context representing a session, it will work only in the session. If the same bean is called outside of its context, that bean excluding memory errors could become a part of another context. All instances inside a context are called contextual instances. A bean and a resource are contextual instances.

...

Interceptors 1.2

This contains annotations and interfaces for defining interceptor methods and interceptor classes and for binding interceptor classes to target classes.

Interceptor classes

An interceptor class is a class that establishes a set of operations to carry out when a bean is invoked. It is marked with @Interceptor:

@Interceptor
public class AuditInterceptor {
...}

Or through the beans.xml file:

<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd" bean-discovery-mode="none">
<interceptors>
<class...

Common annotations for the Java platform 1.2

In common annotations, there are three feature sets.

Common annotation

Provided by the javax.annotation package, it is the basis of dependency injection. ManagedBean is the base used to make a POJO an injected object. By default, we don’t need to use it because the CDI engine 1.2 automatically makes this annotation to the POJO. So, automatically each bean is injectable. The @priority annotation was added in this new specification. The @Generated annotation is very useful to mark autogenerated codes, so you can treat them in a different manner. Here is a sample of PostConstruct:

@PostConstruct
public void reset() {
this.minimum = 0;
}

It will be executed after the creation...

Web console for monitoring beans

WildFly 10 provides a tool to monitor CDI instances as interceptors, decorators, beans, and observer methods. This console is provided by Weld probe 2.3.5.

Weld probe provides the option for to any application to use an additional web console to monitor all CDI components of the web app.

Our example offers a complete web application where you can monitor all the components seen in this chapter.

Web applications will be seen in detail in Chapter 14, Writing a JSF Application. At the moment, just remember that in any web application, if you want to activate the weld console, add this script in your web.xml file:

 <context-param>
<param-name>org.jboss.weld.development</param-name>
<param-value>true</param-value>
</context-param>

Always remember that you usually need a beans.xml to start the CDI container.

To use...

Summary

Now we know, in some depth, about the injections of the Java components and how to use them in WildFly. All Java enterprise components work with CDI to be injected or built. CDI Implementations are a good standalone framework, but they also provide a base to work with the other Java enterprise components. This chapter has introduced you to components that we will see in all of the following chapters. We are now ready for the next chapter, where we will see the Java persistence.

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Key benefits

  • Master Java EE development with the latest WildFly 10 application server.
  • Integrate with JSF and JMS and use efficient load balancing techniques to create real-time apps
  • Integrate your backend JavaScript code seamlessly into Java applications

Description

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.

Who is this book for?

If you are a Java developer with at least basic knowledge of Java EE, then this book is for you. No previous knowledge of WildFly is required.

What you will learn

  • Configure the development environment along with native and cloud installation of WildFly
  • Write a DB schema and the relative entities and how to use the relationships between the entities
  • Analyze with examples all the java annotations to manage the EJB and the configuration to get better performances
  • Write different REST services through the EJB
  • Implement Web sockets 1.0 and know why and when use the web sockets
  • Work with Active MQ and write JMS clients to manage the authentication and authorization in the clients
  • Configure the mail server through the wildfly console
  • Learn how and when to use a new feature JAX-RS 2.0, which is the asynchronous call through REST
  • Use the new JSF features of Wildfly 10 such as Mojarra 2.2, JSF 2.2, Richfaces 4.5
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Publication date, Length, Edition, Language, ISBN-13
Publication date : Jun 20, 2017
Length: 468 pages
Edition : 1st
Language : English
ISBN-13 : 9781787287174
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Product Details

Publication date : Jun 20, 2017
Length: 468 pages
Edition : 1st
Language : English
ISBN-13 : 9781787287174
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Table of Contents

19 Chapters
Introducing Java EE and Configuring the Development Environment Chevron down icon Chevron up icon
Working with Dependency Injection Chevron down icon Chevron up icon
Persistence Chevron down icon Chevron up icon
Implementing Business Logic Chevron down icon Chevron up icon
Working with Distributed Transactions Chevron down icon Chevron up icon
Creating REST Services Chevron down icon Chevron up icon
Implementing WebSockets Chevron down icon Chevron up icon
Working with Messaging Chevron down icon Chevron up icon
Implementing a Mail Client Chevron down icon Chevron up icon
Asynchronous REST Chevron down icon Chevron up icon
Asynchronous EJB Chevron down icon Chevron up icon
Batches and Workflows Chevron down icon Chevron up icon
Working with Servlets and JSP Chevron down icon Chevron up icon
Writing a JSF Application Chevron down icon Chevron up icon
Sharing the Web Sessions Chevron down icon Chevron up icon
WildFly in Cloud Chevron down icon Chevron up icon
Share your Data Chevron down icon Chevron up icon
Deployment Chevron down icon Chevron up icon
Working with OSGi Chevron down icon Chevron up icon

Customer reviews

Rating distribution
Full star icon Full star icon Half star icon Empty star icon Empty star icon 2.3
(3 Ratings)
5 star 33.3%
4 star 0%
3 star 0%
2 star 0%
1 star 66.7%
Salvatore Apr 08, 2018
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
Devo dire che non mi è piaciuto per niente.E' scritto male (a livello semantico molte frasi non si capiscono), e gli argomenti vengono trattati in maniera molto superficiale e blanda.Altra cosa negativa è che gli esempi di codice non hanno un minimo senso, non sono esempi di utlizzo reale. Questa cosa è veramente negativa perchè non ti fa capire il perchè devo usare una determinata feature.Bocciato.
Amazon Verified review Amazon
Gaurav Srivastva Oct 14, 2017
Full star icon Empty star icon Empty star icon Empty star icon Empty star icon 1
This book is a joke if you bought it to learn. It briefly touches on topics with no depth.
Amazon Verified review Amazon
David Sep 28, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
This book is a very good source of informations on the the most recent JavaEE and Web technologies.The author, using a clear and effective language, starts with the basics and then gradually moves to the advanced topics, covering most of the technologies included in Wildfly.
Amazon Verified review Amazon
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