On Fri, Mar 18, 2016 at 11:23 PM, Michael Neynens <
mneyn...@mdacorporation.com> wrote:

> Geoserver 2.8.1
>
>
>
> Hi all,
>
>
>
> I am migrating data from Geoserver 2.2.5 to Geoserver 2.8.1. There is some
> modification done to the layergroups, datastore, and featuretype xml files
> to make the compliant with 2.8.1.
>

Trying to make sure I understand this sentence... are you saying you
performed some manual/scripted modification to the xml files to make them
compliant with 2.8.x?
That should not be necessary, at least in theory, GeoServer should be able
to pick up an old configuration, and upgrade it to the new version when you
save that
particular layer or group.

The error you're seeing seems to be related to GWC trying to extract the
styles from a layer in which none are found... maybe the layer in question
has dangling references to non existing styles?
Unfortunately the logs do not seem to provide a clue as to which layer that
is...

Cheers
Andrea

-- 
==
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Ing. Andrea Aime
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