EJB - What is the difference between HTTPSession and Stateful Session Bean

GeekInterview.com > Interview Questions > J2EE > EJB

Go To First | Previous Question | Next Question

EJB | Question 27 of 175

What is the difference between HTTPSession and Stateful Session Bean

Total Answers and Comments: 2

Last Update: July 28, 2005

Sponsored Links

Best Rated Answer

—

No best answer available. Please pick the good answer available or submit your answer.

May 03, 2005 19:08:46

Sam P

RE: What is the difference between HTTPSession and Stateful Session Bean

From a logical point of view, a Servlet/JSP session is similar to an EJB session. Using a session, in fact, a client can connect to a server and maintain his state.
But, is important to understand, that the session is maintained in different ways and, in theory, for different scopes.

A session in a Servlet, is maintained by the Servlet Container through the HttpSession object, that is acquired through the request object. You cannot really instantiate a new HttpSession object, and it does not contains any business logic, but is more of a place where to store objects.

A session in EJB is maintained using the SessionBeans. You design beans that can contain business logic, and that can be used by the clients. You have two different session beans: Stateful and Stateless. The first one is somehow connected with a single client. It maintains the state for that client, can be used only by that client and when the client "dies" then the session bean is "lost".

A Stateless Session Bean does not maintain any state and there is no guarantee that the same client will use the same stateless bean, even for two calls one after the other. The lifecycle of a Stateless Session EJB is slightly different from the one of a Stateful Session EJB. Is EJB Containers responsability to take care of knowing exactly how to track each session and redirect the request from a client to the correct instance of a Session Bean. The way this is done is vendor dependant, and is part of the contract.

Is this answer useful? Yes | No

July 28, 2005 12:47:11

J. P. Naidu

RE: What is the difference between HTTPSession and Stateful Session Bean

Session Bean comes with the implicit services where as HHTPSession does not.

Session Bean can be web based or can be stand alone where the other can only be web based.

Session Bean can be used for multiple operation for a single HTTP request but the other cannot.

Is this answer useful? Yes | No

What is difference between call by value and call by reference in function?

The arguments passed to function can be of two types 1. Values passed 2. Address passed The first type refers to call by value and the second type refers to call by reference. For instance consider program1 main() { int x=50, y=70; interchange(x,y); printf(“x=%d y=%d”,x,

The Interview Snafu

How to turn someone else’s mistake to your advantage Your dream job is about to become reality. A recruiter gave you the heads up about the perfect position at Humungous Conglomerate, Inc. You went through five interviews as well as a battery of psychological tests mandated by their HR de

Winning a Job Interview with a Winning Resume

Does your resume unlock your potential, take your skills to the highest level and win you the interview and the job you want now? The job market today is highly competitive and even if you think you have what it takes to get an interview you won’t get over the line without a polished, prof

Importance of Proper English during Job Interview

Importance of Proper English during Job Interview Your job interview is crucially important and it will determine whether or not you will get the job Depending on the type of job you re going for it is very important for you to use proper English In most cases jobs which offer higher salaries will h

JSP Implicit and Session Objects

JSP Implicit and Session Objects In this JPS tutorial you will learn how to program using JSP JSP expressions and Implicit Objects JSP Session Object methods of session object getAttribute String name getAttributeNames and isNew mosgoogle JSP expressions If a programmer wants to insert data into an

Difference between Scholarship and Grant

Difference between Scholarship and Grant While both scholarships and grants allow students to pay for their tuition without having to pay the money back there are a number of key differences between the two Knowing the difference between grants and scholarship will make it much easier for students t

HR Interview - HR Interview Mistakes You Will Want To Avoid

HR Interview Mistakes You Will Want To Avoid The job interview can be a stressful process This is especially true for those who are going after a competitive position Your nonverbal communication combined with the answers you give during the interview will determine if you are hired mosgoogle While

HR Interview - Behavioral HR Interviews

Behavioral HR Interviews As the name implies a behavioral interview is an interview that is held by a human resources department to determine if an applicant has the behaviors that are appropriate for a job The company must know how an applicant will behave in a certain situations mosgoogle The logi

HR Interview - How To Prepare For Your HR Interview

How To Prepare For Your HR Interview Before you begin thinking about how you are going to dress for the interview it is important to do your research first You should learn everything you can about the company you wish to work for When you have detailed information about your employer you will conve

HR Interview - Telephone Interview Etiquette

Telephone Interview Etiquette When you conduct a telephone interview for a job it is important to show the proper etiquette Not only is it important it is critical is you wish to be hired by the company There are a number of things you will want to do and other things should never be done mosgoogle