Book Image

Java EE 8 Development with Eclipse - Third Edition

By : Ram Kulkarni
Book Image

Java EE 8 Development with Eclipse - Third Edition

By: Ram Kulkarni

Overview of this book

Java EE is one of the most popular tools for enterprise application design and development. With recent changes to Java EE 8 specifications, Java EE application development has become a lot simpler with the new specifications, some of which compete with the existing specifications. This guide provides a complete overview of developing highly performant, robust and secure enterprise applications with Java EE with Eclipse. The book begins by exploring different Java EE technologies and how to use them (JSP, JSF, JPA, JDBC, EJB, and more), along with suitable technologies for different scenarios. You will learn how to set up the development environment for Java EE applications and understand Java EE specifications in detail, with an emphasis on examples. The book takes you through deployment of an application in Tomcat, GlassFish Servers, and also in the cloud. It goes beyond the basics and covers topics like debugging, testing, deployment, and securing your Java EE applications. You'll also get to know techniques to develop cloud-ready microservices in Java EE.
Table of Contents (20 chapters)
Title Page
Copyright and Credits
Dedication
Packt Upsell
Free Chapter
1
Introducing JEE and Eclipse
Index

Creating a Course Management application using EJB


Let's now create the Course Management application that we created in Chapter 4, Creating JEE Database Applications, this time using EJBs. In Chapter 4, Creating JEE Database Applications, we created service classes (which were POJOs) for writing the business logic. We will replace them with EJBs. We will start by creating Eclipse projects for EJBs.

Creating EJB projects in Eclipse

EJBs are packaged in a JAR file. Web applications are packaged in a Web Application aRchive (WAR). If EJBs are to be accessed remotely, then the client needs to have access to business interfaces. Therefore, EJB business interfaces and shared objects are packaged in a separate JAR, called EJB client JAR. Furthermore, if EJBs and web applications are to be deployed as one single application, then they need to be packaged in an EAR.

So, in most cases the application with EJBs is not a single project, but four different projects:

  • EJB project that creates EJB JAR
  • EJB client...