Picapport Server won't handle geojson files correct

Hi, I'm running in some problems using geoson files. Using the same configuration on a raspberry 4 works. Switching to a docker container on my Synology takes me to that problem. What happens:

I'm adding a geojson file to a picture directory.
the geojson should be recogniced by the crawler and a thumbnail should be created.
This works on the Raspberry but not in container.
Issue is, in cache the thumbnail is created but has a size of 0 bytes.
On top, there is a wrong handling of the geojson file in folder: Can't show geojson without pictures.

After some research I suspect the error lays in the Java version used. Regards, Hans

Here's some commented lines of the logfile:

:::: Delete existing geojson via Websurface (works): REMOV@ 21:53:08.620 2020-12-27 DaysToKeep=30: userid=hans file=/srv/photos/2020/2020 04 06 - Bodensee mal anders/map.geojson

:::: copied geojson file into directory: ERROR@ 21:53:39.690 Exception Error PhotoCrawler.DirectoryConsumer.createSubstituteIfReqired: java.lang.NullPointerException: null ERROR@ 21:53:39.693 Exception Error PicApportFilePhotoCache.createCache: javax.imageio.IIOException: Can't read input file!

:::: Start Crawler via Websurface: MSG @ 21:54:53.640 Crawler manually started... ERROR@ 21:54:57.204 Exception Error PhotoCrawler.DirectoryConsumer.createSubstituteIfReqired: java.lang.NullPointerException: null MSG @ 21:54:58.314 Crawler terminated...

whatever4711 / picapport

Picapport Server won't handle geojson files correct #10