Hi Laurent,
two things:
-1- For serving JP2 efficiently, you need to use, in my experience, the
Kakadu SDK, either through GeoServer own direct plugin or via GDAL. Mind
you, do not expect JP2 to be super fast, regardless of using GeoServer or
other OS servers.
-2- 800 files are a lot to show at the same time ( I am assuming these are
aerial or satellite RGB imagery) when you zoom out; you will need to make
sure you use exclusion rules based on the zoom level in your style. The
alternative is to mix this layer with a lower resolution layer
-3- I think you are missing a JP2 plugin. See -1- above, I would suggest
using Kakadu, regardless of using GDAL or not.

Hope this helps.

Regards,
Simone Giannecchini
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On Tue, Sep 7, 2021 at 11:47 AM celati Laurent <laurent.cel...@gmail.com>
wrote:

> Good morning,
>
> I am a newbie with geoserver.
>
> I work with windows and geoserver 2.18.1.
> I have to serve 800 JP2 files.
> Please find below their characteristics:
> 8 bit unsigned. 3 bands. Pixel size : 2.5,-2.5
> Dimension  : X: 4000 Y: 4000.
>
> Could you tell me which tools, which extensions allow to serve my 800 JP2
> files ?
> I just tried to create a new repository with ImageMosaic but i have this
> error message :
>
> Could not list layers for this store, an error occurred retrieving them:
> Failed to create reader from file://D:\SIG-GLOBAL-ANDRA\IGN\BD_SCAN25\temp
> and hints Hints: REPOSITORY =
> org.geoserver.catalog.CatalogRepository@2b8e2550 EXECUTOR_SERVICE =
> java.util.concurrent.ThreadPoolExecutor@2d8b60c[Running, pool size = 0,
> active threads = 0, queued tasks = 0, completed tasks = 0] System defaults:
> COMPARISON_TOLERANCE = 1.0E-8 GRID_COVERAGE_FACTORY = GridCoverageFactory
> TILE_ENCODING = null FEATURE_FACTORY =
> org.geotools.feature.LenientFeatureFactoryImpl@48e371fa
> LENIENT_DATUM_SHIFT = true FORCE_AXIS_ORDER_HONORING = http FILTER_FACTORY
> = FilterFactoryImpl STYLE_FACTORY = StyleFactoryImpl
> FORCE_LONGITUDE_FIRST_AXIS_ORDER = true
>
>
> Could you confirm to me that ImageMosaic is the relevant tool  for my need
> ?
> I have no install the gdal extension. As far i understood, i have to
> install this extension in order to be abble to serve JP2 files with
> imageMosaic ? Could you confirm to me ?
>
> If there are alternative ways to reach my goals ? Thanks a lot.
>
>
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> - Earning your support instead of buying it, but Ian Turton:
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>
> If you want to request a feature or an improvement, also see this:
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>
>
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Please make sure you read the following two resources before posting to this 
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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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