使用lein uberjar生成的jar由于NoClassDefFoundError而失败

问题描述

我有一个简单的网路应用程式与这个project.clj：

I have a simple web app with this project.clj:

(defproject squirrel-money "1.0.0-SNAPSHOT"
  :description "Squirrel Money"
  :dependencies [[org.clojure/clojure "1.2.0"]
                 [org.clojure/clojure-contrib "1.2.0"]
                 [compojure "0.5.3"]
                 [ring/ring-jetty-adapter "0.3.5"]
                 [hiccup "0.3.1"]
                 [postgresql "8.4-701.jdbc4"]
                 [clj-time "0.2.0-SNAPSHOT"]]
  :dev-dependencies [[lein-eclipse "1.0.0"]]
  :main squirrel-money.main
  :repl-init-script "src/squirrel_money/init_repl.clj")

我的主要看起来像这样：

My main looks like this:

(ns squirrel-money.main
  (:gen-class)
  (:use
    [compojure.core]
    [ring.adapter.jetty])
  (:require
    [compojure.route :as route]
    [squirrel-money.savings :as savings]))

(defn launch [routedef]
  (run-jetty routedef {:port 17080}))

(defroutes money-routes
  (GET "/savings" [] (savings/render))
  (route/not-found "Page not found"))

(defn -main [& args] (launch money-routes))

但是，当我用 lein uberjar 生成一个jar并尝试执行它：

With REPL works just fine. However, when I generate a jar with lein uberjar and try to execute it as:

java -jar squirrel-money-1.0.0-SNAPSHOT-standalone.jar

具有此异常：

Exception in thread "main" java.lang.NoClassDefFoundError: compojure/response/Renderable
    at squirrel_money.main$fn__1067.invoke(main.clj:18)
    at squirrel_money.main__init.load(Unknown Source)
    at squirrel_money.main__init.<clinit>(Unknown Source)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:247)
    at clojure.lang.RT.loadClassForName(RT.java:1578)
    at clojure.lang.RT.load(RT.java:399)
    at clojure.lang.RT.load(RT.java:381)
    at clojure.core$load$fn__4511.invoke(core.clj:4905)
    at clojure.core$load.doInvoke(core.clj:4904)
    at clojure.lang.RestFn.invoke(RestFn.java:409)
    at clojure.lang.Var.invoke(Var.java:365)
    at squirrel_money.main.<clinit>(Unknown Source)
Caused by: java.lang.ClassNotFoundException: compojure.response.Renderable
    at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
    ... 13 more

我做错了什么？如何让它工作？

What am I doing wrong? How to get it to work?

不知道是否重要，但我注意到，在jar我的文件，clojure本身和Java libs解包为.class文件，而所有clojure libs只存在纯文本.clj文件。

Not sure if that matters, but I noticed that inside the jar my files, clojure itself and Java libs are unpacked as .class files, while all clojure libs are present only as plain .clj files.

推荐答案

这似乎是一个leinigen 1.4.0错误。您可以尝试使用leiningen 1.3.1创建uberjar。

This seems to be a leinigen 1.4.0 bug. You might want to try creating an uberjar with leiningen 1.3.1.

编辑：

Leiningen 1.4.0删除非项目 .class 文件来解决Clojure错误（参见）。显然这个行为有时会导致问题。

Leiningen 1.4.0 deletes non-project .class files to work around a Clojure bug (see CLJ-322). Apparently this behavior can sometimes cause problems.

您可以保留leiningen 1.4.0从删除非项目 .class 通过在您的 project.clj中设置：keep-non-project-classes 为 true 。

You can keep leiningen 1.4.0 from deleting non-project .class files by setting :keep-non-project-classes to true in your project.clj.

查看相关的了解详情。

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