Answer Posted / 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 it possible to have threading in ejb?

992

---

Who took over ejb?

1060

---

What is session facade in ejb?

1022

---

Can an ejb send asynchronous notifications to its clients?

974

---

What are the various types of entrepreneur java bean?

953

---

What does ejb stand for?

1045

---

Which services are provided to ejb components by the ejb container?

1140

---

Why do we need ejb?

1024

---

Enlist the CallBack methods of Session Bean?

1042

---

Why is ejb used?

975

---

What is ejb technology?

898

---

What is message-driven bean?

1026

---

What is session bean in ejb?

999

---

Is it possible to share an httpsession between a jsp and ejb?

913

---

How many ejb objects are created for a bean?

975

---