Compojure Example from Clojure in Action Not Working

Question

I am working on the Compojure example from Clojure in Action page 232

(ns compojure-test.core
  (:gen-class)
  (:use compojure))

(defroutes hello
  (GET "/" (html [:h1 "Hello world"]))
  (ANY "*" [404 "Page not found"]))

(run-server {:port 8080} "/*" (servlet hello))

But when I attempt to run it:

$ lein run
Exception in thread "main" java.lang.ClassNotFoundException: compojure-test.core
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
...

it appears that the statement

(:use compojure)

I have also heard that there was a major change between recent versions of compojure. What ma I doing wrong in setting up this compojure app? Is there a good tutorial online to help me get up and running?

leonardoborges · Accepted Answer · 2013-04-05 05:24:46Z

3

You might want to try changing your use statement to:

(:use compojure.core)

That should do it.

I created a boilerplate template a while back for compojure that has a working example you can see here.

Even better, if you're using Leiningen - which you should - you can simply create a new compojure project like this:

$ lein new compojure hello-world

Checkout compojure's Getting Started for more.

answered Apr 5, 2013 at 5:24

leonardoborges

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2 Comments

David Williams Over a year ago

Thanks for the answer, and thanks for the boilerplate. Quick n00b question, how do I setup my project.clj and how do I run this on localhost?

leonardoborges Over a year ago

I'd recommend using the lein template. Once you create the project, your project.clj should be good to go. Then just run this in your project root: lein ring server and it should open up the browser at the root of your webapp. Once this works, all you need is to implement your code.

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