[seam-dev] [seam-persistence] ManagedPersistenceContextExtension

[Mark Struberg]

Ok txs. This means Hibernate must load all properties of an entity in a very eager way. Even ElementCollections and blobs, right?

Otherwise you cannot distinguish between 

*) field is null because the blob didn't get loaded yet (_loaded==false)
*) field is null because it got set to null to clear it (_loaded==true, _dirty==true)

The _dirty is not that important (only can help to improve performance), but it would be fine if the JPA spec could introduce a 

@Loaded
private BitField _loaded;

like we have with @Version.    

wdyt?

LieGrue,
strub

PS: sorry if this is now a bit OT already ...

--- On Mon, 7/11/11, Emmanuel Bernard <emmanuel at hibernate.org> wrote:

> From: Emmanuel Bernard <emmanuel at hibernate.org>
> Subject: Re: [seam-dev] [seam-persistence] ManagedPersistenceContextExtension
> To: "Mark Struberg" <struberg at yahoo.de>
> Cc: "John D. Ament" <john.d.ament at gmail.com>, "seam-dev at lists.jboss.org" <seam-dev at lists.jboss.org>
> Date: Monday, July 11, 2011, 8:19 AM
> 
> On 11 juil. 2011, at 09:53, Mark Struberg wrote:
> 
> > I'm not sure about Hibernate, but OpenJPA and
> Eclipselink both store _loaded and _dirty bitfields in
> detached entities and this info will also get serialized
> along the line.
> 
> We don't as we don't mandate bytecode enhancement.