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How to get Clojure Compojure app to run headless through a compiled jar in a Docker container?

Update : This question has changed since the original set of commentators left answers. I apologize for any confusion.

This is my code repository https://github.com/Integralist/spurious-clojure-example you can use it as an example of what I'm working with.

Please note that the above repo relies on a library that I haven't published in Clojars yet (since I'm still testing it, so this question was open). You can see the source code of the library here: https://github.com/Integralist/spurious-clojure-aws-sdk-helper

I have a Clojure hello world web application written in Compojure that works fine when I start with lein ring serverand lein run(since now I have a function -main). It also works to a certain extent when compiled into a jar, and I run java -jar app.jar.

My problem is that if I try to start the default java -jar app.jarfrom the Docker container, I get the following error telling me ...

spurious-clojure-example is starting
2015-02-14 00:58:03.812:INFO:oejs.Server:jetty-7.x.y-SNAPSHOT
2015-02-14 00:58:03.854:INFO:oejs.AbstractConnector:Started SelectChannelConnector@0.0.0.0:8080
Started server on port 8080
Exception in thread "main" java.awt.HeadlessException:

My code is currently using a function -mainlike ...

(ns spurious-clojure-example.repl
  (:use spurious-clojure-example.handler
        ring.server.standalone
        [ring.middleware file-info file])
  (:gen-class))

(defonce server (atom nil))

(defn get-handler []
  (-> #'app
    (wrap-file "resources")
    (wrap-file-info)))

(defn start-server
  "used for starting the server in development mode from REPL"
  [& [port]]
  (let [port (if port (Integer/parseInt port) 8080)]
    (reset! server
            (serve (get-handler)
                   {:port port
                    :init init
                    :auto-reload? true
                    :destroy destroy
                    :join true}))
    (println (str "You can view the site at http://localhost:" port))))

(defn stop-server []
  (.stop @server)
  (reset! server nil))

(defn -main []
  (start-server))

... but how can I get the server to start without a head? I can’t fully follow the Compojure pattern to decipher where and how it knows when to run headless or through a browser?

I know that on the command line you can make lein ring server-headlessit the software equivalent?

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2

ring- , . java.awt.HeadlessException GUI. :open-browser? false, .

+1

Docker EXPOSE

EXPOSE Docker , . (. ) , , -P. . EXPOSE , , . , -p -p.

, project.clj, , Docker, -p -P .

, , .

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