difference between jsf beans and ejb beans

java jsf jakarta-ee ejb
Alexis picture Alexis · Nov 28, 2010 · Viewed 13.6k times · Source

I need some clarification. I know how to work with JSF and its corresponding session beans, but i am getting confused with EJB. What is the difference between the beans introduced with EJB and the session beans used with JSF (for ejb i know about the stateless/full session beans and entity beans, entity manager, etc.). What i just dont get is when to use EJB and when to use jsf beans. Aside from the entity beans, both the ejb stateful/less session beans seem similar to the jsf session beans. I've read about injection ejb's into jsf, but why not just use ejb in conjunction with jsf beans? I hope you can understand my confusion. Thank you.

Answer

user2538100 picture user2538100 · Jul 2, 2013

First of all, we need to know about the difference between JSF and EJB beans.

  1. JSF beans are POJO classes which used to read the component value of JSF. There are two type of beans in JSF:

    • Managed bean is about how a java bean is created and initialized. As you know, JSF uses the Lazy initialization model. It means that the bean in the particular scope is created and initialized not at the moment when the scope is started, but on-demand, i.e. when the bean is first time required.

    • Backing bean is about the role a particular managed bean plays. This is a role to be a server-side representation of the components located on the page. Usually, the backing beans have a request scope, but it is not a restriction.

  2. EJB Bean is a server-side component that encapsulates the business logic of an application. The business logic is the code that fulfills the purpose of the application.

Mainly, there are three types of session beans:

1.Statefull session bean

2.Stateless session bean

3.Singleton session bean(ejb 3.1)

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