/usr/share/java/jetty9-jmx-9.2.23.v20171218.jar is in libjetty9-java 9.2.23-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/java/jetty9-jmx.jar
/usr/share/java/jetty9-jmx.jar