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
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Entity Beans
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- 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.
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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.

How many types of session beans are available in ejb?

1024

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What is the advantage of using entity bean for database operations, over directly using jdbc api to do database operations? When would I use one over the other?

1237

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How can I access ejb from asp?

1074

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What optimization could I use if the ejb container is the only point of write access to the database?

1062

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What is passivation and activation in ejb?

991

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Match the ejb functions given below with the functionality equivalent in sql?

1019

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Is functional programming stateless?

1055

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Is having static initializer blocks legal in ejb?

994

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What is @autowired required false?

1079

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What is a ejb container?

1013

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What is the difference between find and select methods in ejb?

1052

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Define Context?

1133

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

951

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What is ejb in java with example?

1038

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Where is ejb used?

1000

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