Re: [eclipselink-users] Re: rcp, osgi, and dynamic weaving

[Tom Ware <tom.ware@xxxxxxxxxx>]

The most common cause of this issue is serializing an instance of the object 
from a VM that does not have weaving enabled.  Is it possible that is what is 
happening for you?

-Tom

Philipp Kursawe wrote:
> On Wed, 07 Jan 2009 15:26:59 +0100, Tom Ware <tom.ware@xxxxxxxxxx> wrote:
>
> > Why not?  The classes are weaved when they are loaded.  As far as the 
> > java VM is concerned the classes are the same for the life of the app.
>
> I have tried it out. It's not working. With EclipseLink weaving in 
> place, the identity of the objects changes.
> If I have 2 objects of Type Foo and one comes from the database 
> operation like em.find(primary id) then the
>
> "em.find(1) instanceof Foo" returns false. The debugger reveals, that 
> the Class of the objects differ. One has the weaved methods in it, and 
> therefore a different identity (Java VM id). Have you actually tried 
> this weaving? I have not got it working and reverted to dynamic-jpa 
> which works out of the box.
>
> > -Tom
> >
> > Philipp Kursawe wrote:
> > > On Wed, 07 Jan 2009 14:36:52 +0100, Tom Ware <tom.ware@xxxxxxxxxx> 
> > > wrote:
> > >
> > > > Dynamic weaving is used for several performance enhancing features 
> > > > in EclipseLink. (e.g. lazy loading of ToOne relationships, fetch 
> > > > groups, optimized change tracking, optimized cache lookups)
> > > >
> > > > When enabled, it provides all these features transparently and hence 
> > > > boosts the performance of your application.
> > >  Unfortunatly it also changes the identity of objects. You cannot do 
> > > a instanceof anymore with weave'd objects.
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