Unable to get `cider-jack-in` to work

1
votes

See an error message: error in process sentinel: Could not start nREPL server: That’s not a task. Use "lein help" to list all tasks.

In the *Messages* buffer, the full form of the error is:

error in process sentinel: nrepl-server-sentinel: Could not start nREPL server: That’s not a task. Use "lein help" to list all tasks.

M-x cider-version shows

CIDER 0.15.0snapshot (package: 20170525.255)

Tried fiddling around with ~/.lein/profiles.clj to explicitly add in

{:user {:plugins [[cider/cider-nrepl "0.15.0snapshot"]]}}`

... but that didn't change anything.

(getting back to Clojure after a while with a "fresh" install (Emacs, clojure-mode, cider, etc. so might have missed some small environment setup step, just don't know what that is!)

1
clojurecider

1 Answers

1
votes

Turns out the incompatibility was not with the nRepl middleware, but with Leiningen itself.

Once I uninstalled the version I had installed using apt-get, and self-installed using the downloaded script, and made sure this new version was what which lein led to, this problem went away.

More details: Running cider-jack-in was triggering a call to lein update-in with further arguments, but the version of Leiningen I had simply didn't show update-in as one of the options when I ran lein help.