/usr/share/java/glassfish-toplink-essentials.jar is in glassfish-toplink-essentials 1:2.1.1-b31g+dfsg1-3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/../maven-repo/toplink/essentials/toplink-essentials/2.1/toplink-essentials-2.1.jar