Hello Michael, I've updated my JNA based Java bindings to support lou_registerLogCallback and lou_setLogLevel. See https://github.com/liblouis/liblouis-java/commit/a30a1ad7212bed369c3ffd651c393ca241f83ae6 if you like to know how I did it. Cheers, Bert For a description of the software, to download it and links to project pages go to http://www.abilitiessoft.com