The Java Agent bootstraps using the javaagent command-line option. Add this option to the resin.sh or resin.bat file.
Instrument Resin 1.x - 3.x for Windows
Open the resin.bat file, located at <resin_home>/bin.
At the beginning of your application server start script, add the javaagent argument with the full path (including drive) to the javaagent.jar file on your system: