Topic 6: Enterprise JavaBean (EJB) components

Goal

To introduce students to Enterprise JavaBeans (EJB) as server-side components used to manage business logic in enterprise applications.

🎯 Learning Objectives

Students should be able to:

1. Explain the concept of JavaBeans and Enterprise JavaBean (EJB)
2. Differentiate between JavaBean and EJB
3. Describe the types of EJB (Session, Entity, Message-Driven)
4. Understand the role of EJB in enterprise architecture
5. Apply simple JavaBean concepts in web applications

📌 Topics to Cover

1. Introduction to JavaBean
   • What is a JavaBean
   • Properties (getter & setter)
   • Naming conventions
2. JavaBean in Web Applications
   • Using JavaBeans with JSP
   • Passing data between components
3. Introduction to EJB
   • What is EJB
   • Why use EJB in enterprise systems
4. Types of EJB
   • Session Bean (business logic)
   • Entity Bean (database representation – concept only)
   • Message-Driven Bean (MDB) (asynchronous processing – concept only)
5. EJB in Architecture
   • Placement in multi-tier architecture
   • Integration with Servlet and JSP

🛠️ Hands-on Activity (Tutorial)

Activity: Using JavaBeans in Student Management System

Students are required to:

1. Create JavaBean Class

Example: Student.java

Attributes:

• name
• email
• program

Include:

• Getter and Setter methods

2. Use JavaBeans in Servlet

• Create object:

Student s = new Student();

• Set values:

s.setName(name);

• Pass to JSP:

request.setAttribute("student", s);

3. Display in JSP

• Access using Expression Language:

${student.name}
${student.email}
${student.program}

4. (Conceptual EJB Understanding)

• Students explain:
  • Where a Session Bean would be used
  • Where MDB might be used (e.g., email notification system)

Expected Output

Students should produce:

1. JavaBean class (Student.java)
2. Updated Servlet
3. JSP page displaying object data
4. Simple explanation of EJB types

📚 Suggested Readings

1. Oracle JavaBeans Tutorial https://docs.oracle.com/javase/tutorial/javabeans/
2. Introduction to EJB https://jakarta.ee/learn/docs/jakartaee-tutorial/current/entbeans/ejb-intro/ejb-intro.html
3. https://en.wikipedia.org/wiki/Jakarta_Enterprise_Beans
4. https://www.tutorialspoint.com/ejb/ejb_overview.htm
5. https://www.geeksforgeeks.org/java/enterprise-java-beans-ejb/
6. https://medium.com/@upadhyay068/everything-you-need-to-know-about-enterprise-javabeans-ejb-features-types-and-rmi-9c8da700e86a