Interested to Buy Any Domain ? << Click Here >> for more details...
What is the major difference SessionBean and EntityBean?
- 3 Answers
- 8750 Views
- KPIT, Wipro, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Answer / janet
Session Beans state can be shared by only one client at a
time - persistence storage device .ser file.
EntityBeans state can be shared by multiple
clients,because as its persistence storage device is DB.
| Is This Answer Correct ? | 5 Yes | 2 No |
Answer / sulthansheriff
In entity-bean , there are finder- method which are not in
session-bean
In entity-bean , CMR's are used , which are not there in
session-bean
----------------------------------------
Entity Beans
-------------
- represents an entity
- must have at least one finderXXX() method
- may or may not have create() or createXXX() methods
- when you call remove() on an entity bean the entity is
removed permanently but the bean instance goes back to the
pool it never die's.
- Entity beans home interface can have Home Business methods
- Entity beans home methods may or may not return component
interface object.
- Entity bean create() method creates a new row into the
database whereas create() method in session bean doesn't.
- Entity bean's finder method that returns a collection will
never throw a exception if it does not find related records
in the underlying persistent storage instead it will return
an empty collection.
- Entity beans will survive container crash as long as the
data is persisted in the underlying storage.
-----------------------------------------------------------
Session Bean
-------------
- generally they are used to perform some actions(verbs)
- there are two types of SB stateless and stateful.
- should have at least one create() "no args" constructor
(Stateless bean only)
- Stateless beans are more scalable then stateful beans.
- Stateless beans do not retain conversational state between
method invocations.
- Stateless beans are not tied to a particular client
whereas stateful beans are.
- The result of a client calling create() on home interface
of a stateless SB does not result into creation of a bean
but in stateful it does.
- There is no effect of calling remove() on Stateless
session bean because the beans go back to the pool after the
method call completes.
- session beans will never survive a container crash.
| Is This Answer Correct ? | 3 Yes | 0 No |
Answer / eavi
Session Beans state can be shared by only one client at a
time - persistence storage device .ser file.
EntityBeans state can be shared by multiple
clients,because as its persistence storage device is DB.
| Is This Answer Correct ? | 0 Yes | 4 No |
Where a bean can be used ?
An instance of stateful session ejb when accessed simultaneously from more than one clients on same vm results in remoteexception or ejbexception. In case the client is a servlet thread, which of the techniques can be used to avoid remoteexception/ejbexception?
Differentiate Phantom from Un-repeatable?
Differentiate “find a method” from “select method” in EJB ?
What does @inject mean in java?
What is passivation and activation in ejb?
Is method overloading allowed in ejb?
What is difference between ejb and spring?
what is mean by dll ? Please answer me. Advance thanks.
what is an ejb object?
5 Answers Bally Technologies, HCL, Siemens,
The ejb container implements the ejbhome and ejbobject classes. For every request from a unique client, does the container create a separate instance of the generated ejbhome and ejbobject classes?
what are the classes you used in Beans?
Core Java 
