EJB Tutorials

Types of EJB

  • 2007-02-20
  • Comments
  • aathishankaran
  • 751

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
  • 751

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
  • 752

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
  • 751

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
  • 751

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. Typecasting proved very much helpful to me...esp.
View Tutorial          By: itan at 2010-05-04 01:30:24

2. Ho,i have created read and write program on differ
View Tutorial          By: niranjan at 2015-08-26 09:02:57

3. PLEASE I WANT A CODE TO BE PUT BEHIND A BUTTON SO
View Tutorial          By: KALUSHA at 2012-07-02 12:32:56

4. some more examples should be given...
View Tutorial          By: flora at 2010-12-08 03:32:50

5. hai
View Tutorial          By: ayyannan at 2011-01-21 21:27:35

6. i fixed it already...

how can I get

View Tutorial          By: kathleen ashley at 2010-08-08 04:51:26

7. I will try
View Tutorial          By: bridges at 2009-09-06 22:09:46

8. Hi, thanks alot this code works for me , can someo
View Tutorial          By: ann at 2011-03-18 04:50:16

9. So, is it possible to use the getClass() and getRe
View Tutorial          By: cee at 2014-11-29 14:27:10

10. i have same error sir..
Error applying tran

View Tutorial          By: CRUDZ at 2013-10-13 05:22:24