Hi Paweł,
looks like you're using two community modules
<https://docs.geoserver.org/stable/en/user/community/index.html> there, the
OGC API one, and the
features templating one. The error is strange, it makes me think of a
version mis-alignment.

Just to make sure, are you using everything properly aligned, in particular:

   - OGC API and Features templating from the same version of GeoServer
   - A GeoServer 2.21.x nightly built the day as the two plugins?

Using a release of GeoServer with nightly builds of the plugins _might_
work, but might also give the results you're seeing,
if any change occurred in the middle.

If you use everything from the same build and it still occurs, it might
also be a packaging issue.
Do you have the full stack trace, from the logs?

Cheers
Andrea


On Thu, Aug 11, 2022 at 10:09 AM Paweł Soczewski via Geoserver-users <
geoserver-users@lists.sourceforge.net> wrote:

> Hi All,
>
> I want to move the production implementation of OGC API-Feature service
> based on an early version of Geoserver 2.19.x. up to newer version.
> Unfortunately both 2.20.x and 2.21.x don't support custom  GML and HTML
> user templates. After choosing HTML and GML encoding the server the
> server responds with an error:
>
> {"type":"NoApplicableCode","title":"java.lang.NoSuchMethodError:
>
> org.codehaus.stax2.ri.SingletonIterator.create(Ljava/lang/Object;)Lorg/codehaus/stax2/ri/SingletonIterator;\norg.codehaus.stax2.ri.SingletonIterator.create(Ljava/lang/Object;)Lorg/codehaus/stax2/ri/SingletonIterator;"}
>
> However custom templates for GeoJSON and JSON-LD work fine. I use the
> same configuration as works fine in early 2.19.x.
>
> When I don't use my custom GML and HTML temaplates and Geoserver uses
> predefined formating, the service works fine as well.
>
> I also tested the last version of 2.19.x with latest dedicated for it
> moduls OGC API and Feature Templating and it dosen't work too but the
> reason is diffrent. After instaling .jar libraries the Geoserver
> application dosen't started. When delete libraries OGC API and Feature
> Templating libraries it works fine.
>
> Any idea how to fix it?
>
>
> Regards,
>
> pawel
>
>
>
>
> Paweł Soczewski
> Główny Specjalista ds. Infrastruktury Przestrzennej
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>
> Please make sure you read the following two resources before posting to
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> - Earning your support instead of buying it, but Ian Turton:
> http://www.ianturton.com/talks/foss4g.html#/
> - The GeoServer user list posting guidelines:
> http://geoserver.org/comm/userlist-guidelines.html
>
> If you want to request a feature or an improvement, also see this:
> https://github.com/geoserver/geoserver/wiki/Successfully-requesting-and-integrating-new-features-and-improvements-in-GeoServer
>
>
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>


-- 

Regards,

Andrea Aime

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