Question

我正在尝试在我的heroku dyno上启动我的clojure应用程序但是我在stuartsierra.component / start中继续得到错误。

(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))

这是我的所有stuartsierra.component代码的核心文件。当我在我的笔记本电脑上本地运行它lein repl然后(go)以及我只做lein run时，这一切都非常有效。所以当我把它推到heroku dyno时，我很困惑为什么它不起作用。

我得到的错误是

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)

这告诉我:listener中的nil system-map为lein repl。当我在(go)中进行本地检查（(keys system) (:listener)}是(-> system :listener)这是好的，这意味着监听器正在启动并且在系统中。

当我#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"]}}时，我得到:listener这是完美的，因为端口已加载（3300）并且服务器已启动。

这使得我的heroku应用中nil为public class ScoreCard { strong text private double[] scores; /** * @param val * @param low * @param high * @return low if val < low, * high if val > high, * val if val is between low and high */ private double constrain(double val, int low, int high) { if (val < low) return low; if (val > high) return high; else return val; } /** * DEEP copy m into scores with each item contrained between 0 and 100. * use method {@link this#constrain(double, int, int)}. * For example, if s = {-15.2, 67.4, 126.8}, scores should become * {0, 67.4, 100}, AND scores should be a DEEP copy of s. * @param s (assume s is not null) */ public void setMarks(double[] s) { for(int i = 0; i < s.length; i++) { if (s[i] < 0 || s[i] > 100) constrain(s[i], 0, 100); this.scores[i] = s[i]; } }的原因更令人困惑

非常感谢任何帮助。感谢

Heroku - 使用Stuart Sierra组件错误的Clojure App＆＃34; main＆＃34;

0 个答案: