/usr/share/jetty9/lib/apache-jsp/org.apache.taglibs.taglibs-standard-impl.jar is in jetty9 9.2.21-1+deb9u1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/jetty9/lib/apache-jsp/../../../java/taglibs-standard-impl.jar