Question

I’m trying to set up a simple clojure project, and I’m not sure how to load files between the project. I’m sure that the answer is in the documentation, but I can’t find a simple answer any where and I’m not sure where to look.

Essentially, my directory looks like this:

Clojure/
    clojure/
        clojure.jar
        other clojure files
    clojure-contrib/
        clojure-contrib.jar
        other contrib files
    project/
        main.clj
        utils.clj

And I want main.clj to be something like this:

(ns project.main
  (:require project.utils))
(greet)

and utils.clj to be something like this:

(ns project.utils)
(defn greet [] (println "Hello, World!"))

But that fails with:

Exception in thread "main" java.io.FileNotFoundException: Could not locate project/utils__init.class or project/utils.clj on classpath:  (main.clj:1)

When I attempt to run it. My classpath includes the top Clojure/ directory and both jars. I also tried putting the project/ directory in the classpath as well, with no luck.

How do you set up a simple clojure project?

Answer 1

You don’t mention what your environment is (i.e. Emacs/SLIME/Swank, vim/Vimclojure), so I’m going to assume you are trying to invoke it from the command line.

You need to have your Clojure/ project directory in the classpath:

java -cp path/to/clojure.jar:path/to/clojure-contrib.jar:path/to/Clojure ...

Make sure to check that paths are correct relative to current working directory. It needs to point to the root of your namespace (i.e. if running in Clojure/, the path is .).

In fact, your project layout Works On My Machine(tm), with the exception that I have use instead of require (but you should’ve got a different error anyway if you got to the point when Clojure could find all your files).