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Re: [eclipselink-users] Re: rcp, osgi, and dynamic weaving
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In OSGi, dynamic weaving will be enabled if you have the
org.eclipse.persistence.jpa.equinox.weaving and
org.eclipse.persistence.jpa.equinox bundles deployed. If you do not have those
bundles deployed, we cannot weave dynamically as we do not have the necessary
classloader hooks.
If you are interested in getting EclipseLink running I'd love to help you out.
The first thing we should do is figure out whether the issue you are seeing is
related to weaving behavior, caching behavior, or OSGi. If the objects are
weaved, in your debugger, you will see a number of new variables, with names
starting with "_persistence". If you do not see those variables, there is
something else going on.
Please let me know if you you'd like some help getting EclipseLink working,
Tom
Philipp Kursawe wrote:
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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- References:
- Re: [eclipselink-users] Re: rcp, osgi, and dynamic weaving
- From: Chiovari Cristian Sergiu
- Re: [eclipselink-users] Re: rcp, osgi, and dynamic weaving
- Re: [eclipselink-users] Re: rcp, osgi, and dynamic weaving
- Re: [eclipselink-users] Re: rcp, osgi, and dynamic weaving
- Re: [eclipselink-users] Re: rcp, osgi, and dynamic weaving
- Re: [eclipselink-users] Re: rcp, osgi, and dynamic weaving
- Re: [eclipselink-users] Re: rcp, osgi, and dynamic weaving