Clojure Uberjar 未加载资源文件 [英] Clojure Uberjar not loading resource file

问题描述

我使用 lein uberjar 创建应用程序的独立 jar.

I use lein uberjar to create a standalone jar of an application.

执行时

java -jar dataloader-0.1.0-SNAPSHOT-standalone.jar,

它崩溃了:

Caused by: java.lang.IllegalArgumentException: Not a file:
jar:file:dataloader-0.1.0-SNAPSHOT-standalone.jar!/configuration.json

我通过以下方式加载文件:

I load the file via:

(ns dataloader.configuration
  (:gen-class)
  (:require [cheshire.core :refer :all]
            [clojure.java.io :as io]))

(def data-file
  (io/file
    (io/resource "configuration.json")))

project.clj

project.clj

(defproject dataloader "0.1.0-SNAPSHOT"
  :description "Used for loading stage data into local vagrantbox"
  :url "http://example.com/FIXME"
  :license {:name "Eclipse Public License"
            :url "http://www.eclipse.org/legal/epl-v10.html"}
  :resource-paths ["resources"]
  :dependencies [[org.clojure/clojure "1.6.0"]
                 [clojurewerkz/elastisch "2.1.0"]
                 [org.clojure/java.jdbc "0.3.7"]
                 [mysql/mysql-connector-java "5.1.32"]
                 [clj-http "2.0.0"]
                 [org.clojure/data.json "0.2.6"]
                 [org.clojure/data.codec "0.1.0"]
                 [cheshire "5.5.0"]]

  :main ^:skip-aot dataloader.core
  :target-path "target/%s"
  :profiles {:uberjar {:aot :all}})

resources/configuration.json放在jar的根目录

resources/configuration.json is put into the root folder of the jar

推荐答案

clojure.java.io/resource 返回一个 URL，而不是一个文件.这就是为什么您可以在其上调用 slurp 的原因.错误消息告诉您它不是一个文件，不幸的是它没有告诉您它是一个 URL.

clojure.java.io/resource returns a URL, not a file. That's why you can call slurp on it. The error message is telling you that it's not a file, unfortunately it's not telling you that it's a URL.

当然，您可以使用 java.net.URL api 打开 url，尽管在这种情况下这会有点矫枉过正.

Of course you could open the url with the java.net.URL api although that would be overkill in this case.

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