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    <p><strong>[UPDATE April 2013]</strong></p> <p>Leiningen 2, which has been officially released for some time, includes the concept of project templates. By default, Leiningen provides an <code>app</code> template that provides what you need out of the box. Try:</p> <p><code> lein new app my-project </code></p> <p>You will see that Leiningen creates the familiar project template, but also includes:</p> <ul> <li>The default namespace of <code>my-project.core</code> as the <code>:main</code> entry in your <code>project.clj</code> file</li> <li>The <code>:gen-class</code> form in the namespace declaration of <code>my-project.core</code></li> <li>A default <code>-main</code> function in the <code>my-project.core</code> namespace</li> </ul> <p>For those who cannot yet use Leiningen 2, the <a href="https://github.com/Raynes/lein-newnew" rel="noreferrer">lein-newnew</a> plugin provides an equivalent experience under Leiningen 1.</p> <p><strong>[/UPDATE]</strong></p> <p>To build a project that, when run, prints "Hello World!", you'd do as follows (revision of your process above):</p> <h2>Setup</h2> <pre><code>lein new my-project cd my-project lein deps </code></pre> <p>You should now have a basic structure in place and the Clojure jar in your <code>lib</code> folder.</p> <h2>Write a Function</h2> <p>Now edit <code>src/my_project/core.clj</code> with your editor of choice, adding the following below the <code>(ns ...)</code> form:</p> <pre><code>(defn -main [] (println "Hello World!")) </code></pre> <p>This function is inside your <code>my-project.core</code> namespace. To ensure this gets run as your main, let's add a <code>gen-class</code> parameter to your namespace definition at the top, so that it now looks like this at the top of <code>core.clj</code>:</p> <pre><code>(ns my-project.core (:gen-class :main true)) </code></pre> <p>So all together, your <code>core.clj</code> file looks like this:</p> <pre><code>(ns my-project.core (:gen-class :main true)) (defn -main [] (println "Hello World!")) </code></pre> <h2>Configure it as the Main Function</h2> <p>Once you've got <code>src/my_project/core.clj</code> edited as above, you need to tell Leiningen (the build tool) where the "main" function for your project lives. Here's an example <code>defproject</code> form that does this:</p> <pre><code>(defproject my-project "1.0.0-SNAPSHOT" :description "My Project" :dependencies [[org.clojure/clojure "1.2.1"]] :main my-project.core) </code></pre> <p>Now the <code>-main</code> function inside <code>my-project.core</code> becomes the entry-point for your program.</p> <h2>Run It</h2> <p>You can now have two options for running this project:</p> <ul> <li>Use <code>lein run</code> at the command-line while at the root of your <code>my-project</code> project</li> <li>Create a standalone jar file by running <code>lein uberjar</code>. You can then run the resultant jar file by running <code>java -jar my-project-1.0.0-SNAPSHOT-standalone.jar</code></li> </ul>
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    1. COAs my edit says, I think the error is in my laptop environment as the project compiles ok when copied directly to desktop. However a great post, so I'll upvote it.
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