For subclasses without a mapping file, mappings for superclasses are ignored. A workaround is to provide mapping files for such subclasses.
Mappings files for keyType and componentType of maps are also not read.
Investigation shows that XMLTypeCreator.createMapType delegates to nextCreator, which is a DefaultTypeCreator, since there are no mapping file for java.util.Map. DefaultTypeCreator then creates the keyType and componentType without bothering to check for mapping files.
A patch is included for the latter case.