如何让Clojure Compojure应用程序通过编译的jar在Docker容器中运行无头？ [英] How to get Clojure Compojure app to run headless via compiled jar within Docker container?

问题描述

更新：此问题自原始评论者留下回应后已更改。对于任何混乱，表示抱歉。

Update: this question has changed since the original set of commenters left responses. Apologies for any confusion.

这是我的代码库 https://github.com/Integralist/spurious-clojure-example 您可以使用它作为我正在使用的示例。

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

请注意，上面的repo依赖于我还没有发布到Clojars的库（因为我仍在测试它 - 因此这个问题打开） 。您可以在此处查看库的源代码： https://github.com/ Integralist / spurious-clojure-aws-sdk-helper

我有一个hello worldClojure Compojure，我使用 lein环服务器和 lein run （因为我有一个 -main function now created）。它也在一定程度上运行到编译成一个jar，我运行 java -jar app.jar 。

I have a "hello world" Clojure web app written with Compojure that I have working fine when run using lein ring server and lein run (as I have a -main function now created). It also runs to a certain extent when compiled down into a jar and I run java -jar app.jar.

我现在的问题是，如果我试图在Docker中运行默认的 java -jar app.jar 容器我得到以下错误告诉我...

My problem now is that if I try to run the default java -jar app.jar from within a 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:

我的代码目前正在使用 -main 函数...

My code is currently using a -main function like so...

(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))

...但是如何让服务器开始无头？我不能完全按照Compojure样板代码来解释在哪里或如何知道何时运行无头或通过浏览器？

...but how do I get the server to start headless? I can't quite follow the Compojure boilerplate code to decipher where or how it knows when to run headlessly or via browser?

我知道在命令行上 lein ring server-headless 所以什么是程序化的呢？

I know that on the command line you can do lein ring server-headless so what's the programmatic equivalent of that?

推荐答案

因为环网服务器主要是用于开发，它尝试在服务器启动时打开浏览器。在没有GUI的平台上，这会失败并显示 java.awt.HeadlessException 。您需要将：open-browser？选项设置为false以防止出现此情况。

Because ring-server is primarily meant for development, it tries to open a browser when the server starts. This fails with a java.awt.HeadlessException on platforms without a GUI. You'll want to set the :open-browser? option to false to prevent this.

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