/usr/share/maven-repo/io/netty/netty-common/debian/netty-common-debian.jar is in libnetty-java 1:4.0.34-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/maven-repo/io/netty/netty-common/debian/../../../../../java/netty-common.jar