Difference between Javabean and EJB

Question

Just a simple question from a relative Java newbie:

what is the difference between a JavaBean and an EJB?

Answer 1

Java bean is just a set of conventions. EJB is a standard for J2EE business components.

Specifically a Java bean:

• has a public default constructor;
• readable propertiy methods prepended with "get";
• writable propertty methods prepended with "set"; and
• is Serializable.

For example, a Java bean with a property of "margin" would minimally look like this:

public class MyBean implements Serializable {
  private int margin;

  public MyBean() { }
  public int getMargin() { return margin; }
  public void setMargin(int margin) { this.margin = margin; }
}

EJB, despite the name, is almost completely unrelated.

Answer 2

JavaBeans are reusable software components for Java that can be manipulated visually in a builder tool.

Enterprise JavaBeans (EJB) is a managed, server-side component architecture for modular construction of enterprise applications.

Answer 3

Take a look at this article - JavaBeans vs Enterprise JavaBeans

SUMMARY:

JB

JavaBeans takes a low-level approach to developing reusable software components that can be used for building different types of Java applications (applets, stand-alone apps, etc.) in any area.

EJB

Enterprise JavaBeans takes a high-level approach to building distributed systems. It frees the application developer to concentrate on programming only the business logic while removing the need to write all the "plumbing" code that's required in any enterprise application.