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I am trying to start my clojure application on my heroku dyno but I keep getting and error in my stuartsierra.component/start.


(defrecord Listener [listener]
  (start [component]
    (assoc component :listener (yada/listener
                                   ["public/" (new-directory-resource (io/file "target/cljsbuild/public") {})]
                                   [true (as-resource nil)]]]
                                 (or (env :port) (get (read-config "resources/config.edn" {:profile :dev}) :webserver))
  (stop [component]
    (when-let [close (-> component :listener :close)]
    (assoc component :listener nil)))

(defn new-system []
    :listener (map->Listener {})

(def system nil)

(defn init []
  (alter-var-root #'system
                  (constantly (new-system))))

(defn start []
  (alter-var-root #'system component/start))

(defn stop []
  (alter-var-root #'system
                  (fn [s] (when s (component/stop s)))))

(defn go []

(defn reset []
  (refresh :after 'web.core/go))

(defn -main
  [& [port]]
  (component/start (new-system))
  (println "System Started")


This is my core file with all my stuartsierra.component code. This all works perfectly when I run it locally on my laptop doing lein repl and then (go) and also when I just do lein run. So I am confused as to why it doesn't work when I push this to the heroku dyno.


The error I get is

Exception in thread "main" clojure.lang.ExceptionInfo: Error in component :listener in system com.stuartsierra.component.SystemMap calling #'com.stuartsierra.component/start {:reason :com.stuartsierra.component/component-function-threw-exception, :function #'com.stuartsierra.component/start, :system-key :listener, :component <#C2TLV30Q1|web>.core.Listener{:listener nil}, :system #<SystemMap>}, compiling:(/tmp/form-init9049917434081554913.clj:1:73)


This is telling me that my :listener is nil in the system-map. When I check locally (doing lein repl (go)) in (keys system) is (:listener) which is good so that means that the listener is starting and is in the system.


When I do (-> system :listener) I get

#web.core.Listener{:listener {:port 3300, :close #object[yada.aleph$listener$fn__21671 0xa5d4865 "[email protected]"], :server #object[aleph.netty$start_server$reify__13574 0x3cc9a232 "[email protected]"]}}
which is perfect as the port has loaded up (3300) and the server has started.


This makes it all the more confusing as to why the :listener is nil in my heroku app Any help would be much appreciated. Thanks