Here is the full mail exchange from geoserver-users mailing list : http://osgeo-org.1560.x6.nabble.com/Using-ImageMosaic-with-JPEG2000-no-image-td5405337.html
I first tried to publish a folder of Jpeg2000 images, and while trying to fix an error, I saw I couldn't even publish a single Jpeg2000 file. Enclosed are one image, the .tab that is delivered by the image provider, and the WorldFile .j2w I created. The 3 files are zipped.
These files are on a folder within the /data of Geoserver 2.15.1. I installed both the GDAL plugin and the JP2K plugin from the download page of Geoserver. The Jp2K is proposed in the datastores, but :
there is no "Browse" button to search the file to publish
when I type the path to the image, I got error : Could not list layers for this store, an error occurred retrieving them: null
The full log is attached.