/usr/share/groovy/lib/bsf.jar is in groovy 2.0.0~beta2+isreally1.8.6-0ubuntu1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/groovy/lib/../../java/bsf.jar
/usr/share/groovy/lib/../../java/bsf.jar