Clojure Uberjar没有加载资源文件

Question

我使用lein uberjar创建一个独立的应用程序jar.

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:

(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

(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被放入jar的根文件夹中

Answer 1

clojure.java.io/resource返回一个URL,而不是一个文件.这就是你可以打电话的原因slurp.错误消息告诉您它不是文件,遗憾的是它没有告诉您它是一个URL.

当然你可以用java.net.URL api打开url,虽然在这种情况下会有点过分.

Answer 2

如果要读取configuration.json文件的内容，请不要调用io/file. 相反，使用slurp函数，就像这样：

(def config (slurp (io/resource "configuration.json")))