lein ring server with nrepl doesn't honour cider-nrepl

Question

When I start up my current project with lein ring server and try to connect to it from Emacs via cider, I get the following warning:

; CIDER 0.8.2 (Java 1.7.0_51, Clojure 1.6.0, nREPL 0.2.6)
WARNING: The following required nREPL ops are not supported: 
apropos classpath complete eldoc info inspect-start inspect-refresh inspect-pop inspect-push inspect-reset macroexpand ns-list ns-vars resource stacktrace toggle-trace-var toggle-trace-ns undef
Please, install (or update) cider-nrepl 0.8.2 and restart CIDER
user> 

However, I do have a dependency for [cider/cider-nrepl "0.8.2"] in my project.clj. This is working just fine when I run lein repl and to which I can then connect just fine from cider:

; CIDER 0.8.2 (Java 1.7.0_51, Clojure 1.6.0, nREPL 0.2.6)
swedishchef.handler>

I can see that I get two different messages from leiningen wrt. nREPL, depending on how I start:

[sugarcube->swedishchef]lein ring server
See https://github.com/technomancy/leiningen/wiki/Repeatability)
Started nREPL server on port 44231

This is the output with the working cider-nrepl connection:

[sugarcube->swedishchef]lein repl
See https://github.com/technomancy/leiningen/wiki/Repeatability)
nREPL server started on port 38024 on host 127.0.0.1 - nrepl://127.0.0.1:38024
REPL-y 0.3.5, nREPL 0.2.6

Looking at the output of lein deps :tree I don't see any problems. So, my first question is whether this supposed to work, i.e., if cider-nrepl should override lein rings behavior wrt. to nrepl startup? If so, could somebody give some advice for further troubleshooting?

Longlongan

Answer 1

Use latest lein-ring plugin version 0.9.2 and add :nrepl-middleware containing vector of nrepl-middlewares to :repl-options in your project.clj

For example, I create the project by lein new compojure-app my-app. Then, I tested it by creating a empty leiningen profile in ~/.lein/profiles.clj ex. {:yolo {}} and starting ring server by lein with-profile yolo,dev ring server.

(defproject my-app "0.1.0-SNAPSHOT"
  :description "FIXME: write description"
  :url "http://example.com/FIXME"
  :dependencies [[org.clojure/clojure "1.6.0"]
                 [compojure "1.1.6"]
                 [hiccup "1.0.5"]
                 [ring-server "0.3.1"]
                 [cider/cider-nrepl "0.8.2"]]
  :plugins [[lein-ring "0.9.2"]]
  :ring {:handler my-app.handler/app
         :init my-app.handler/init
         :destroy my-app.handler/destroy
         :nrepl {:start? true}}
  :repl-options {:nrepl-middleware
                 [cider.nrepl.middleware.apropos/wrap-apropos
                  cider.nrepl.middleware.classpath/wrap-classpath
                  cider.nrepl.middleware.complete/wrap-complete
                  cider.nrepl.middleware.info/wrap-info
                  cider.nrepl.middleware.inspect/wrap-inspect
                  cider.nrepl.middleware.macroexpand/wrap-macroexpand
                  cider.nrepl.middleware.ns/wrap-ns
                  cider.nrepl.middleware.resource/wrap-resource
                  cider.nrepl.middleware.stacktrace/wrap-stacktrace
                  cider.nrepl.middleware.test/wrap-test
                  cider.nrepl.middleware.trace/wrap-trace
                  cider.nrepl.middleware.undef/wrap-undef]}
  :profiles
  {:uberjar {:aot :all}
   :production
   {:ring
    {:open-browser? false, :stacktraces? false, :auto-reload? false}}
   :dev
   {:dependencies [[ring-mock "0.1.5"] [ring/ring-devel "1.3.1"]]}})

Crawl

I started adding the nrepl-middleware explicitly but first didn't get the expected results as I hadn't updated lein-ring. Looking at the changelog for lein-ring, it's pretty clear that this is a recent change. Thanks! – Longlongan