I\'m using nrepl.el, Emacs 24.2. My S.O version is OS X Lion 10.7.5.
Running the command [M-x] nrepl
after start a REPL session through lein (:~ $
for those of you landing on this question who are using a Mac:
lein needs to be on the path as seen by Emacs. This can be done by starting Emacs from bash
/Applications/Emacs.app/Contents/MacOS/Emacs project.clj
then: M-x nrepl-jack-in
If this solves the problem you can configure emacs to use the correct path by following these instructions