On Wed, Feb 1, 2012 at 2:12 PM, Andrea Aime
<andrea.aime@anonymised.com> wrote:
Hi,
when working with GeoServer configuration we pay special attention to make
sure that it's always possible to upgrade GeoServer from one version to the
next without significant hiccups (not saying that it always works 100%, but at
least we try hard 
)
A current thread on the user list seems to imply that the same is not happening
GeoWebCache wise, the schema for geowebcache.xml changed and it seems
that the current code cannot read a document that was working fine with
GeoServer 2.0.2 + embedded GWC, breaking with a schema validation.
Schema validation can't break anything because it's not used to
"enforce" the configuration. The validation at start up is _only_ used
to log a warning message. XStream doesn't apply schema validation
afaik.
How do we handle that so that we're not going to face similar issues in the
future? Maybe change the GWC parsing technology so that it's not
schema dependent,
As mentioned before, it's not schema dependant. Yet having a schema
and performing the validation at startup is a good way of letting the
user's know if there's something wrong with their config.
or version the document similarly to OGC specs,
and have a different schema and parser for each version?
The way it is handled right now is that an xslt stylesheet is applied
to the document at start up to make it match the current version. Only
if the configuration is saved later on programmaticaly the config file
will be saved with the latest format. Otherwise it'll be kept intact
and the log warning will show up at each start up, but it's nothing
but that, a log warning.
Also, there are unit tests that check every previous version is
compatible with the current one.
All that said, as you mentioned that thread suggests there's something
wrong. I asked the user who reported that to provide the original
geowebcache.xml document to see if that's actually the case or
something else. It may well be a corner case not covered by the unit
tests, of course.
Cheers,
Gabriel
Cheers
Andrea
--
-------------------------------------------------------
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
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phone: +39 0584 962313
fax: +39 0584 962313
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--
Gabriel Roldan
OpenGeo - http://opengeo.org
Expert service straight from the developers.