The statement about stopping and restarting jetty being trouble puzzles me. So far, it’s as simple as the following two statements: sudo systemctl stop jetty9, sudo systemctl start jetty9 and each takes executes close to immediately.
Have you had problems with Jetty before, or are you extrapolating from your experiences with other Java applications, like Tomcat and Apache?. (I’m running Jetty independently of Apache. I chose Jetty specifically to avoid combos like Tomcat + Apache or Tomcat + nginx.)