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

["Philipp Kursawe" <phil.kursawe@xxxxxxxxx>]

On Wed, 07 Jan 2009 16:29:48 +0100, Tom Ware <tom.ware@xxxxxxxxxx> wrote:

> 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?

I have weaving enabled, cause I have not disabled it. It should be on by  
default, shouldn't it?
Since I moved away from EclipseLink as it took me too long to get it  
running I cannot provide a screenshot of what goes on from the debugger.  
You could clearly see the weaved in methods and that the JavaVM ids of the  
weaved and non-weaved objects (created by new Foo) were not equal.
Running Equinox as the OSGi provider.

> -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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