Yes,I too want the answere to this question from sun people.

>----------
>From:  Mark Westover[SMTP:[EMAIL PROTECTED]]
>Reply To:      A mailing list for Enterprise JavaBeans development
>Sent:  Friday, December 03, 1999 3:22 AM
>To:    [EMAIL PROTECTED]
>Subject:       Re: Transaction isolation level useless at the ejb server
>level?
>
>Vlada Matena wrote:
>
>
>>If two client requests arrive to the same entity
>>object (i.e. same primary key),
>>the EJB container can do one of the following:
>>
>>    - use a different bean class instance for each
>>transaction context, or
>>
>>    - use a single instance but serialize the use of
>>the instance by the transactions
>>
>>If the first method is used, the underlying resource
>>managers will properly
>>isolate the work of the multiple clients.
>
>
>I am a bit puzzled by this answer. In the situation
>posited above, if two copies of an entity class are
>used (one per transaction), and each transaction
>modifies its copy, which copy is valid, which is
>stored?
>
>
>Mark
>
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