/usr/share/java/netty3.1.jar is in libnetty3.1-java 3.1.0.CR1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/netty3.1-3.1.0.CR1.jar
/usr/share/java/netty3.1-3.1.0.CR1.jar