To configure the script service for packet mirroring:
[edit services global service packetMirroring script]
user@host# show
type script;
status active;
available;
script {
script-type url;
class-name net.juniper.smgt.sae.packetMirroring.LiService;
file file:///opt/UMC/sae/var/run/pm.jar;
}See Configuring Parameters for the Script Service for Packet Mirroring.