Re: CMP and writing instance back to database

WebLogic 6.1 does not claim to be compliant with EJB 2.1 (this would be
temporally impossible I believe). If you look at the EJB 2.0 spec, this
section is different (it is 10.5.9). See if that makes more sense.


>From: johan <[email protected]>
>Reply-To: johan <[email protected]>
>To: [email protected]
>Subject: Re: CMP and writing instance back to database
>Date: Sat, 17 Apr 2004 15:15:15 +0200
>
>Why would you assume that "synchronizes the instance's state with the
>persistent storage" should require the container to force beans to
>persistent store even though the container knows the state is already
>in sync (because it was never altered)?
>
>/johan
>
>On 2004-04-17, at 10.20, Janne Mattila wrote:
>
>>Some confusion about the EJB specification:
>>
>>EJB 2.1 specification, 10.5.10, "commit options" states that "container
>>synchronizes the instance's state with the persistent storage at
>>transaction commit for all three (commit) options". Table 6 states this
>>even more explicitly, having "Yes" at "Write instance state to
>>database"
>>for all commit options. Reading this, I would assume that the
>>specification
>>requires CMP engine to write each bean back to database at commit
>>time, no
>>matter what.
>>
>>This in contradiction with my experiences with WebLogic. WebLogic 6.1
>>"...Server CMP implementation automatically detects modifications of
>>CMP
>>fields and writes only those changes to the underlying datastore.".
>>This
>>seems logical, as writing CMP fields back when they have not been
>>changed
>>would not be efficient.
>>
>>Does anyone have an idea on what is really going on here:
>>
>>a) the intent of specification indeed requires that all fields be
>>written
>>back to db at commit, but WebLogic has chosen not to follow the
>>specification to ensure better performance
>>b) specification is written a bit badly, and in fact it requires that
>>ejbStore() be called at commit time - and WebLogic follows that
>>specification properly
>>c) something else?
>>

_________________________________________________________________
MSN Toolbar provides one-click access to Hotmail from any Web page – FREE
download! http://toolbar.msn.com/go/onm00200413ave/direct/01/

===========================================================================
To unsubscribe, send email to [email protected] and include in the body
of the message "signoff EJB-INTEREST".  For general help, send email to
[email protected] and include in the body of the message "help".