/usr/share/maven-repo/ch/ethz/ganymed/ganymed-ssh2/debian/ganymed-ssh2-debian.jar is in libganymed-ssh2-java 250-2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/ch/ethz/ganymed/ganymed-ssh2/debian/../../../../../../java/ganymed-ssh2-build250.jar