Hello Indigo!
Thanks a lot for the error stack trace! Could you please send your trace level jrebel.log file after reproducing the issue to support@zeroturnaround.com with the link to this forum topic? You can find the instructions on how to generate that file here: http://manuals.zeroturnaround.com/jrebel/misc/sendinglogs.html.
With the best regards,
Valerie