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activation is use to conserve resourse in stateful session bean?

Posted on 2004-08-07
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Last Modified: 2010-03-17
why we say activation is use to conserve resourse in stateful session bean?

as stateful session bean do not participate in instace pooling like stateless session bean and entity bean.
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Question by:she1
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sompol_kiatkamolchai earned 50 total points
ID: 11764847
Here is the stateful session bean life cycle

       ____________
      |Does not exist|
              |   ^
              |   |
              v   |
       ____________                            _______
      |Method ready|   <=======>   | Passive |


Since memory is fixed, a container can free up memory by passivating.
When statefule session bean is in passive state it is stored in secondary storage
and cannot serve client request. So, to have a good management of server side
resource such as database connection we should release connection in ejbPassivate()
and re-claim on ejbActivate()

You may not know that Statefule session bean also have instance pooling like entity or stateless
I will explain you more in the next comment.
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Expert Comment

by:sompol_kiatkamolchai
ID: 11764965
Sorry after I check EJB spec this bean type don't have instance pooling concept like you said.
I think prior comment already answer your question.
:)
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Author Comment

by:she1
ID: 11798930
you says:""When statefule session bean is in passive state it is stored in secondary storage and cannot serve client request. ""

so the statefule session must implement the seriable??

thanks
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Expert Comment

by:sompol_kiatkamolchai
ID: 11806816
Since stateful session bean object extends SessionBean
and SessionBean extends EnterpriseBean
and EnterpriseBean extends java.io.Serializable

so we do not need to implement Serializable again.
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Author Comment

by:she1
ID: 12012799
thanks lot, exellent explain. sorry for later reply
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Expert Comment

by:sompol_kiatkamolchai
ID: 12016190
thanks for the points.
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