EJB Tutorials

Types of EJB

  • 2007-02-20
  • Comments
  • aathishankaran
  • 154128

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
  • 153872

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
  • 157476

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
  • 153359

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
  • 153465

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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EJB 3 Entities

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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. sir can you write the sample proram of this:

View Tutorial          By: bryan labastida at 2011-06-29 02:53:14

2. i get exception NoSuchPortException. i tried on di
View Tutorial          By: harryjoy at 2009-11-22 05:52:48

3. IN the above program at the line in ineerclass's p
View Tutorial          By: Narasimha at 2009-10-14 06:30:26

4. hi i unable to retrive am getting below excepti
View Tutorial          By: vignesh at 2015-03-25 17:14:58

5. Hi VIKRAM, You cannot use your sim card number the
View Tutorial          By: Ramlak at 2007-03-29 00:38:55

6. Please help me i am getting following error messag
View Tutorial          By: Balaji at 2009-09-23 22:54:06

7. VERY good info. Providing By YOU Thanx.
View Tutorial          By: Ravi singh at 2013-11-14 08:56:34

8. Just what I was looking for. Great work. thx.
View Tutorial          By: SP Goh at 2008-03-24 01:09:09

9. Would be great if you also showed how to manipulat
View Tutorial          By: Sparx at 2010-01-05 13:51:56

10. we are java research students.
we are worki

View Tutorial          By: chetan at 2007-10-17 08:13:14