How i configure monit to start a process with a specific user?

 check process tomcat with pidfile /var/run/tomcat.pid
       start program = "/etc/init.d/tomcat start" 
             as uid nobody and gid nobody
       stop program  = "/etc/init.d/tomcat stop"
             # You can also use id numbers instead and write:
             as uid 99 and with gid 99
       if failed port 8080 then restart

(source)