Jar produced with lein uberjar fails on NoClassDefFoundError

Question

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")

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))

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

It dies with this exception:

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

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

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.

Answer 1

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

Edit:

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.

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.

See the related leinigen issue for more info.