/usr/share/java/cobertura.jar is in libcobertura-java 1.9.4.1+dfsg-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/cobertura-1.9.4.1.jar
/usr/share/java/cobertura-1.9.4.1.jar