Go to $JETTY_HOME/bin and create the file jetty-jrebel.sh with the following contents:
#!/bin/bash export JAVA_OPTIONS="-javaagent:$AGENT_PATH_UNIX -Xms256m -Xmx512m -XX:MaxPermSize=256m $JAVA_OPTIONS" `dirname $0`/jetty.sh $@
Use this script instead of jetty.sh
if you want to run Jetty with JRebel.