- World's Largest Collection of Interview Questions & Answers, FAQs, queries, sample papers, exam papers, dumps, what, why, how, where, when questions
Our Services
Get 9,000 Interview Questions & Answers in an eBook.

Get it now !!
Send your Resume to 6000 Companies

Search Interview Questions

Question: How is Stateful Session bean maintain their states with client?


Category EJB Interview Questions & Answers - Exam Mode / Learning Mode
Rating (0.3) By 6222 users
Added on 10/13/2009
Views 57766
Rate it!
Question: How is Stateful Session bean maintain their states with client?


When a client refers to a Stateful Session object reference, all calls are directed to the same object on the EJB container. The container does not require client identity information or any cookie object to use the correct object.
This means that for a client to ensure that calls are directed to the same object on the container, all it has to do is to use same reference for every call.

For example the following holds for all stateful session beans:

StatefulHome sfh = ...//get home interface for stateful bean
Stateful bean1 = sfh.create();
Stateful bean2 = sfh.create();
if (bean1.isIdentical(bean1)){} //this is true!
if (bean1.isIdentical(bean2)){} //this is false!

//Note that the second test would evaluate to true for stateless beans

Thus, if you're calling a Stateful Session Bean from a servlet, your servlet need to keep the reference to the remote object in the HttpSession object between client calls for you to be able to direct calls to the same object on the container.
Likewise, if you're calling from an application, you only obtain the reference to the bean once and reuse the object throughout the application session.

Courtesy : jGuru Source:

Answered by: Harish Vembu | Date: 1/10/2009 | Contact Harish Vembu Contact Harish Vembu

If you have the better answer, then send it to us. We will display your answer after the approval

Rules to Post Answers in

  • There should not be any Spelling Mistakes.
  • There should not be any Gramatical Errors.
  • Answers must not contain any bad words.
  • Answers should not be the repeat of same answer, already approved.
  • Answer should be complete in itself.

Post your answer here

Inform me about updated answers to this question.
Related Questions
View Answer
Is it possible to invoke multiple Session beans from one Session bean using Reflection?
View Answer
Is it possible to share an HttpSession between a JSP and EJB. What happens when I change a value in the HttpSession from inside an EJB?
View Answer
What is clustering. What are the different algorithms used for clustering?
View Answer
How to implement an entity bean which the PrimaryKey is an autonumeric?
View Answer
How many EJB Objects are created for a Bean?
View Answer
What is abstract schema?
View Answer
What is re-entrant. Is session beans reentrant. Is entity beans reentrant?
View Answer
Why an onMessage call in Message-driven bean is always a seperate transaction?
View Answer
Does Stateful Session bean support instance pooling?
View Answer
Why does EJB needs two interfaces(Home and Remote Interface)
View Answer
Can I invoke Runtime.gc() in an EJB?
View Answer
Can a Session Bean be defined without ejbCreate() method?
View Answer
Why are ejbActivate() and ejb Passivate() included for stateless session bean even though they are never required as it is nonconversational bean?
View Answer
With EJB 1.1 specs, why is unsetSessionContext() not provided in Session Beans, like unsetEntityContext() in Entity Beans?
View Answer
What is the difference between ejbStore() and ejbLoad()?
View Answer
What is the difference between ejbCreate() and ejbPostCreate
View Answer
Does stateless Session bean create() method contain any parameters?
View Answer
Can I develop an Entity Bean without implementing the create() method in the home interface?
View Answer
How can i retrieve from inside my Bean(Stateless session and Entity CMP) the user name which i am serving (the user name of user just logged in my web application)?
View Answer
What is EJB architecture(components)?
View Answer

Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here - Best Freshers & Experienced Jobs Website.

View All EJB Interview Questions & Answers - Exam Mode / Learning Mode

India News Network
Latest 20 Questions
Payment of time- barred debt is: (a) Valid (b) Void (c) Illegal (d) Voidable
Consideration is defined in the Indian Contract Act,1872 in: (a) Section 2(f) (b) Section 2(e) (c) Section 2(g) (d) Section 2(d)
Which of the following is not an exception to the rule, "No consideration, No contract": (a) Natural love and affection (b) Compensation for involuntary services (c) Completed gift (d) Agency
Consideration must move at the desire of: (a) The promisor (b) The promisee (c) The promisor or any other party (d) Both the promisor and the promisee
An offer which is open for acceptance over a period of time is: (a) Cross Offer (b) Counter Offer (c) Standing Offer (d) Implied Offer
Specific offer can be communicated to__________ (a) All the parties of contract (b) General public in universe (c) Specific person (d) None of the above
_________ amounts to rejection of the original offer. (a) Cross offer (b) Special offer (c) Standing offer (d) Counter offer
A advertises to sell his old car by advertising in a newspaper. This offer is caleed: (a) General Offer (b) Special Offer (c) Continuing Offer (d) None of the above
In case a counter offer is made, the original offer stands: (a) Rejected (b) Accepted automatically (c) Accepted subject to certain modifications and variations (d) None of the above
In case of unenforceable contract having some technical defect, parties (a) Can sue upon it (b) Cannot sue upon it (c) Should consider it to be illegal (d) None of the above
If entire specified goods is perished before entering into contract of sale, the contract is (a) Valid (b) Void (c) Voidable (d) Cancelled
______________ contracts are also caled contracts with executed consideration. (a) Unilateral (b) Completed (c) Bilateral (d) Executory
A offers B to supply books @ Rs 100 each but B accepts the same with condition of 10% discount. This is a case of (a) Counter Offer (b) Cross Offer (c) Specific Offer (d) General Offer
_____________ is a game of chance. (a) Conditional Contract (b) Contingent Contract (c) Wagering Contract (d) Quasi Contract
There is no binding contract in case of _______ as one's offer cannot be constructed as acceptance (a) Cross Offer (b) Standing Offer (c) Counter Offer (d) Special Offer
An offer is made with an intention to have negotiation from other party. This type of offer is: (a) Invitation to offer (b) Valid offer (c) Voidable (d) None of the above
When an offer is made to the world at large, it is ____________ offer. (a) Counter (b) Special (c) General (d) None of the above
Implied contract even if not in writing or express words is perfectly _______________ if all the conditions are satisfied:- (a) Void (b) Voidable (c) Valid (d) Illegal
A specific offer can be accepted by ___________. (a) Any person (b) Any friend to offeror (c) The person to whom it is made (d) Any friend of offeree
An agreement toput a fire on a person's car is a ______: (a) Legal (b) Voidable (c) Valid (d) Illegal
Cache = 0.03125 Seconds