RE: [eclipselink-users] Fetch Groups

["Mathias Walter" <mathias.walter@xxxxxxx>]

Hi Douglas,

thanks for the hints.

The reason why it doesn't work in my configuration is that neither dynamic
nor static weaving is enabled.
I didn't disable weaving. Thus dynamic weaving should be enabled by default.
But dynamic weaving is not available, if the application is deployed to
Tomcat. :(

Now I try to enable static weaving. Is there any way to include it into the
usual build process of Eclipse (e. g. as a Builder)?
Or do I need to swith to Ant? And how about debugging and incremental
deploying with Eclipse, if Ant is used?

--
Kind regards,
Mathias

> -----Original Message-----
> From: eclipselink-users-bounces@xxxxxxxxxxx [mailto:eclipselink-users-
> bounces@xxxxxxxxxxx] On Behalf Of Douglas Clarke
> Sent: Thursday, August 20, 2009 8:11 AM
> To: EclipseLink User Discussions
> Subject: RE: [eclipselink-users] Fetch Groups
> 
> Mathias,
> 
> The FetchGroupTracker interface is used internally to indicate that a
> domain class is setup for use of fetch-groups. This generally added to
> your domain classes through dynamic or static weaving. This and the
> corresponding FetchGroupManager implementations are automatically
> created at runtime assuming your domain classes are woven and you have
> either a lazy basic mapping or manually configure a default fetch-
> group.
> 
> NOTE: I received an email from another user of the nested-fetch-group
> example that they had some test failures in the project when using
> static weaving that are not seen with dynamic weaving. The root cause
> of the difference has yet to be determined.
> 
> If you check out the complete source to the example you can try the
> provided test cases.
> 
> http://dev.eclipse.org/svnroot/rt/org.eclipse.persistence/branches/1.1.
> 0/trunk/examples/org.eclipse.persistence.example.jpa.nested-fetchgroup/
> 
> Doug
> 
> -----Original Message-----
> From: Mathias Walter [mailto:mathias.walter@xxxxxxx]
> Sent: Wednesday, August 19, 2009 8:01 PM
> To: EclipseLink User Discussions
> Subject: [eclipselink-users] Fetch Groups
> 
> 
> Hi,
> 
> is there any example how to implement FetchGroupTracker?
> 
> The EclipseLink Wiki explains how to set the fetch groups, but not how
> to
> implement FetchGroupTracker.
> Unfortunately, FetchGroupTracker must be implemented for all entities
> participating in a fetch group. And also a DescriptorCustomizer seems
> to be
> necessary for each of these entities which instantiates a new
> FetchGroupManager. That's a bit ugly in my opinion but could be easily
> implemented and copy & paste in persistence.xml. Or is there an easier
> way?
> 
> If the FetchGroupManager is not instantiated a QueryException with
> error
> 6114 is thrown:
> 
> "You must define a fetch group manager at descriptor <entity> in order
> to
> set a fetch group on the query <query>."
> 
> Is there a full example how to use fetch groups?
> 
> I also tried EclipseLink 2.0, but got the same errors. My main goal is
> to
> use Nested Fetch Groups as explained at
> http://wiki.eclipse.org/EclipseLink/Development/JPA/NestedFetchGroups
> and
> bug 244124.
> 
> --
> Kind regards,
> Mathias
> 
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