Dan,
This is not a physical requirement at all, but rather just a logical idea.
If you see section 9.1.1 it will give you two solutions to the 'logical'
idea that there be but one single entity. Basically you can have two actual
instances of the bean (one logical EJBObject) in the container at the data
is syncrhoized at the persistant store, or, one instance and it is
synchronized at the container.
IMHO option #1 is better since if the persistant store is an RDBMS it will
insure consistancy anyways even with option #2 so why duplicate effort. The
only issue with option #1 is the formation of local diamonds which must be
detected by the container.
Dave Wolf
Internet Applications Division
Sybase
> -----Original Message-----
> From: A mailing list for Enterprise JavaBeans development
> [mailto:[EMAIL PROTECTED]]On Behalf Of Dupont, Dennis
> Sent: Tuesday, August 15, 2000 12:50 PM
> To: [EMAIL PROTECTED]
> Subject: Is there a guarantee of uniqueness for entity beans?
>
>
> I have looked through the EJB 1.1 spec for a requirement
> that containers guarantee that entity beans in the ready
> state are unique (i.e. that there is never more than
> one instance of a bean with a given primary key value).
>
> I cannot find such a guarantee, but I would expect one.
> Does anyone know if this is indeed the case?
>
> Thanks!
> Dennis Dupont [EMAIL PROTECTED]
> Quentra Networks (972) 889-5252 (Voice)
> 2121 N. Glenville (972) 671-2311 (Fax)
> Richardson, Texas 75082
>
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