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Jakarta EE Application Development

Jakarta EE Application Development

By : David R. Heffelfinger
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Jakarta EE Application Development

Jakarta EE Application Development

5 (2)
By: David R. Heffelfinger

Overview of this book

Jakarta EE stands as a robust standard with multiple implementations, presenting developers with a versatile toolkit for building enterprise applications. However, despite the advantages of enterprise application development, vendor lock-in remains a concern for many developers, limiting flexibility and interoperability across diverse environments. This Jakarta EE application development guide addresses the challenge of vendor lock-in by offering comprehensive coverage of the major Jakarta EE APIs and goes beyond the basics to help you develop applications deployable on any Jakarta EE compliant runtime. This book introduces you to JSON Processing and JSON Binding and shows you how the Model API and the Streaming API are used to process JSON data. You’ll then explore additional Jakarta EE APIs, such as WebSocket and Messaging, for loosely coupled, asynchronous communication and discover ways to secure applications with the Jakarta EE Security API. Finally, you'll learn about Jakarta RESTful web service development and techniques to develop cloud-ready microservices in Jakarta EE. By the end of this book, you'll have developed the skills to craft secure, scalable, and cloud-native microservices that solve modern enterprise challenges.
Table of Contents (18 chapters)
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15
Chapter 15: Putting it All Together

Session beans

As we previously mentioned, session beans typically encapsulate business logic. One or two artifacts need to be created in order to create a session bean, including the bean itself, and an optional business interface. These artifacts need to be annotated adequately to let the Jakarta EE runtime know they are session beans.

A simple session bean

The following example illustrates a very simple session bean:

package com.ensode.jakartaeebook;
import jakarta.ejb.Stateless;
@Stateless
public class SimpleSessionBean implements SimpleSession{
  private final String message =
    "If you don't see this, it didn't work!";
  @Override
  public String getMessage() {
    return message;
  }
}

The @Stateless annotation lets the Jakarta EE runtime know that this class is a stateless session bean. There are three types of session beans: stateless, stateful, and singleton. Before...

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