EJB Tutorials

Types of EJB

  • 2007-02-20
  • Comments
  • aathishankaran
  • 533

There are three types of Enterprise Java Beans namely session beans, entity beans and message driven beans. This tutorial briefly explains these types of EJB.
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Difference Between Session and Entity Beans

  • 2008-08-25
  • Comments
  • Paul Allen and Joseph Bambara
  • 537

A session bean is an EJB that is created by a client and usually exists only for the duration of a single client-server session. A session bean usually performs operations such as calculations or database access on behalf of the client. While a session bean may be transactional, it is not recoverable if a system crash occurs. Session bean objects can be stateless or they can maintain a conversational state across methods and transactions. If a session bean maintains a state, the EJB container manages this state if the object must be removed from memory. However, persistent data must be managed by the session bean object itself.
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Difference Between Stateful and Stateless Session Beans

  • 2008-08-25
  • Comments
  • Paul Allen and Joseph Bambara
  • 535

Session beans can either be stateful or stateless. With stateful beans, the EJB container saves internal bean data during and in between method calls on the client’s behalf. With stateless beans, the clients may call any available instance of an instantiated bean for as long as the EJB container has the ability to pool stateless beans. This enables the number of instantiations of a bean to be reduced, thereby reducing required resources.
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Required Classes/Interfaces That Must Be Provided for an Enterprise JavaBeans Component

  • 2008-08-25
  • Comments
  • Paul Allen and Joseph Bambara
  • 533

Here we review the component architecture of EJBs. We also cover the required classes and interfaces for EJB, which include the home and remote interfaces, the XML deployment descriptor, the business logic (bean) class, and the context objects. While these names may or may not be meaningful to you at this point, you will soon understand how each of these pieces fits into the EJB component model.
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Managing Security in EJB

  • 2008-08-25
  • Comments
  • Paul Allen and Joseph Bambara
  • 532

To simplify the development process for the enterprise bean provider, the implementation of the security infrastructure is left to the EJB container provider and the task of defining security policies is left to the bean deployer. By avoiding putting hard-coded security policies inside bean code, EJB applications gain flexibility when configuring and reconfiguring security policies for complex enterprise applications. Applications also gain portability across different EJB servers that may use different security mechanisms.
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Required Classes/Interfaces That Must Be Provided for an Enterprise JavaBeans Component

Difference Between Session and Entity Beans

Difference Between Stateful and Stateless Session Beans

Managing Security in EJB

EJB Entity Beans

Types of EJB

Archived Comments

1. hi plz help
how do we change project develo

View Tutorial          By: pratik jogwar at 2012-06-07 19:58:47

2. Nice article, Thank you
View Tutorial          By: kumar kasimala at 2010-04-26 21:09:25

3. Very useful and simple.
Thanks.

View Tutorial          By: harsh at 2014-11-06 10:01:22

4. Hello sir, I observe that in the first version of
View Tutorial          By: Ganny at 2012-08-13 17:04:58

5. Thanks very much....its very simple explained.....
View Tutorial          By: nizam at 2012-12-17 09:43:11

6. I tried ....so this is best solution for understa
View Tutorial          By: rehnuma at 2015-03-30 12:29:38

7. I am getting error like this:
javax.comm:

View Tutorial          By: Santhosh Samban at 2015-01-06 13:47:39

8. im taking hard time in doing programming
View Tutorial          By: joshua louis sumalinog at 2014-12-11 03:26:46

9. After coming to second page again I want to go to
View Tutorial          By: Bhagi at 2012-09-23 06:25:54

10. hey it is really good notes, to give an idea of
View Tutorial          By: Pawan at 2011-03-26 05:17:28