Quick PSA, if you're using launchpad (or lambdaisland/classpath directly) with nREPL 1.6.0-alpha3 or later, then you may notice that hot-reloading of dependencies is broken. I think it's easy to fix in nREPL, I'll try to submit a patch today or tomorrow.
submitted a fix: https://github.com/nrepl/nrepl/pull/464