How to setup the classpath when running the jar made from 'lein uberjar'?

Question

I have a hello.clj as follows.

(ns hello) 
(defn hi [] (println "HI"))

Normally, I can use this function from main.clj as follows. The hello.clj is in the same directory that contains main.clj. And the classpath includes . (current path).

(use 'hello)
(hi)

How can I use this hello.clj for the 'lein uberjar'?

I used 'lein new myproject; lein deps' to get the following structure.

.
|-- README
|-- classes
|   `-- myproject
|-- lib
|   |-- clojure-1.2.0-beta1.jar
|   |-- clojure-contrib-1.2.0-beta1.jar
|   `-- lucene-core-3.0.2.jar
|-- project.clj
|-- src
|   `-- myproject
|       `-- core.clj
`-- test
    `-- myproject
        `-- test
            `-- core.clj

project.clj is as follows.

(defproject myproject "1.0.0-SNAPSHOT"
  :description "FIXME: write"
  :dependencies [[org.clojure/clojure "1.2.0-beta1"]
                 [org.clojure/clojure-contrib "1.2.0-beta1"]
                 [org.apache.lucene/lucene-core "3.0.2"]]
  :main myproject.core)

And core.clj is as follows.

(ns myproject.core
  (:gen-class))

(use 'hello) 

(defn test1 [] (println "hello"))

(defn -main [& args]
  (do 
    (println "Welcome to my project! These are your args:" args)
    (test1)
    (hi)))

Now, where do I put the hello.clj? I tried to copy it to myproject/src directory and run uberjar to get the jar. But, running the jar causes this error message.

prosseek:myproject smcho$ java -jar myproject-1.0.0-SNAPSHOT-standalone.jar a d d
Exception in thread "main" java.lang.ExceptionInInitializerError
Caused by: java.io.FileNotFoundException: Could not locate hello__init.class or hello.clj on classpath:  (core.clj:0)
...

What might be wrong? Error messages says hello.clj is not on the class path. But, how to setup the classpath with 'lein uberjar'?

I uploaded the project here.

Alex Miller Alex Miller · Accepted Answer · 2010-08-02T19:51:34

You put hello.clj under src/myproject so it's ns should be myproject.hello. With this file structure, I would expect hello.clj to say (ns myproject.hello) and for core.clj to say (use 'myproject.hello).

When I make those changes, I get:

$ java -jar myproject-standalone.jar a b c
Welcome to my project! These are your args: (a b c)
hello
HI

How to setup the classpath when running the jar made from 'lein uberjar'?

2 Answers