/usr/share/jetty8/lib/jetty-jndi-8.1.16.v20140903.jar is in libjetty8-extra-java 8.1.16-4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/jetty8/lib/../../java/jetty8-jndi-8.1.16.v20140903.jar