Can you provide the full error message? So the cause as well as the Component ex-info wrapper?
I don't think this is anything to do with :listener being nil. I think you're looking at the Component exception and not checking the "cause" exception with .getCause. My guess is that you're running into problems at (env :port), which will be a string, while the port in the edn configuration will probably be an integer. So it works when PORT isn't set on your local machine, but fails on Heroku where PORT is set. - James On 13 March 2017 at 16:38, 'Rickesh Bedia' via Clojure < [email protected]> wrote: > I am trying to start my clojure application on my heroku dyno but I keep > getting and error in my stuartsierra.component/start. > > Below is my core file containing my main function. > > (defrecord Listener [listener] > component/Lifecycle > (start [component] > (assoc component :listener (yada/listener > ["/" > [(view/view-route) > routes/route-handler > ["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)] > (close)) > (assoc component :listener nil))) > > (defn new-system [] > (component/system-map > :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 [] > (init) > (start)) > > (defn reset [] > (stop) > (refresh :after 'web.core/go)) > > (defn -main > [& [port]] > (component/start (new-system)) > (println "System Started") > @(promise)) > > 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 > #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 > "yada.aleph$listener$fn__21671@a5d4865"], :server > #object[aleph.netty$start_server$reify__13574 0x3cc9a232 > "aleph.netty$start_server$reify__13574@3cc9a232"]}} 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 > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to [email protected] > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
