Hello again,

Running out of options I decided to try compiling GeoMASON
independently. It was not as easy as I thought, but I eventually
managed. With a jar created from the Head revision (1001) I am able to
compile and run my sample models without issue (together with MASON 18
and JTS 1.13). I did all this with Java 8 on the 3.13 kernel - the new
jar is attached.

There is definitely something strange with the GeoMASON 15 jar that
should be investigated thoroughly. With which Java version was it

A separate, but perhaps related, question: why are the GDAL_FILES,
GEOTOOL_FILES and OGR_FILES directives commented out in the make file?
The corresponding class files are missing from the GeoMASON 15 jar.