What do I have to change in my application for JRebel to work?
If you are using exploded deployment you just have to set your IDE to compile to the directories in the application classpath (e.g. WEB-INF/classes). If you’re using packaged deployment you should create a rebel.xml configuration file and put it in the application classpath (e.g. WEB-INF/classes). Please see the installation manual for details.