/usr/share/java/biojava3-modfinder.jar is in libbiojava3.0-java 3.1.0+dfsg-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/biojava3-modfinder-3.1.0.jar
/usr/share/java/biojava3-modfinder-3.1.0.jar