Hello Reuben!
Thank you 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.
Please also specify what is your environment – what IDE, server (local or remote?), any additional software and its version do you use?
Kind regards,
Valerie