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?
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