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

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.


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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