Paolo, > I am wondering if this could be caused by the SWIG version which I am using?
Yes much likely this error is typical of a mismatch between SWIG 1.3 and SWIG 2 or 3. It is likely that the gdal.jar in GeoServer was produced with SWIG 1.3, so you'll need to generate the native part (libgdalconstjni.so, etc...) with SWIG 1.3 as well (you can build it easily from source, ./configure --prefix=$HOME/install-swig-1.3; make; make install and then put $HOME/install-swig-1.3/bin in top of your PATH, before building again the GDAL Java bindings). Or you may try to replace the gdal.jar located somewhere in the geoserver installation with the one you've generated with SWIG 3. But in both cases I'm not completely sure that things will work due to a few (subtle) changes in the GDAL Java API between GDAL 1.x used by this old GeoServer and GDAL 2. Depends if GeoServer uses those API. Even -- Spatialys - Geospatial professional services http://www.spatialys.com
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