Connect to a running Repl

You can connect to a REPL started elsewhere, for example the command line with lein repl, then connect to it from inside Spacemacs. You will need to know:

  • host name / ip address
  • port the repl is listening too

Use the lein repl command to run a new REPL on the command line. Then connect to that REPL using M-x cider-connect

Leiningen REPL on the Command Line

Configuration Required

If you are going to connect to an external repl from Spacemacs, you will need to add the Leiningen plugin called cider-nrepl and the Clojure tools.nrepl library. Rather than add this to all projects, you add these to your Leiningen configuration ~/.lein/profiles.clj file. The versions of each library also had to be kept in sync with updates in the Spacemacs Clojure layer.

{:user {:plugins      [[cider/cider-nrepl "0.11.0-SNAPSHOT"]
                       [refactor-nrepl "2.0.0-SNAPSHOT"]]
        :dependencies [[alembic "0.3.2"]
                       [org.clojure/tools.nrepl "0.2.12"]]}}

Without this configuration, you will see warning messages in the repl buffer stating that the versions of ... are out of sync.

Spacemacs - Cider connect - Warning - `cider-repl` & `tools-nrepl` out of sync

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