/usr/share/jetty8/lib/jsp/tomcat-api.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/jsp/../../../tomcat7/lib/tomcat-api.jar
/usr/share/jetty8/lib/jsp/../../../tomcat7/lib/tomcat-api.jar