Install the JRebel Eclipse plugin by going to Help » Install New Software... and use the URL :
http://www.zeroturnaround.com/update-site/

For offline installation use the downloadable zip archive instead:
http://www.zeroturnaround.com/update-site/update-site.zip


install


If you chose not to use the embedded JRebel, you need to specify the path to jrebel.jar manually. Go to Window » Preferences » JRebel, browse to the installation directory and select the jrebel.jar


preferences


There are also some tweaks to be done in the debugger settings. Go to Window » Preferences and from there to Java » Debug » Step Filtering.

Check Use Step Filters, Filter synthetic methods, and Step through filters. Now check all the default filters and use the Add Filter button to add com.zeroturnaround.* and org.zeroturnaround.*.


Step Filtering


For best experience, go to Project » Build Automatically and make sure it is checked.


Build Automatically