Clojurescript: Error: Could not find or load main class clojure.main

I installed Clojurescript following its quick start guide.

I pulled the git repo to ~/clojurescript. CLOJURESCRIPT_HOME is set ~/clojurescript and clojurescript/bin is added to system path.

When I try to use commands cljsc I get following error

Could not find or load main class clojure.main

How can I solve it?

5 Answers

I was going through this tutorial today.

I checked here for this error. The version of the standalone jar was correct. The problem was caused by a 'typing mistake' in the core.cljs file. The string "Hello world!" was not in double quotes. Initially the string was in single quotes and included a comma.

The other issue I struggled with was getting the java command to work. I was using a Cygwin64 Terminal.

The correct command for the Cygwin64 Terminal is:

$ java -cp "cljs.jar;src" clojure.main build.clj 

In my case, I was typing Windows command by mistake which has " in the command + make sure you'll have the cljs.jar in your root folder bes

java -cp cljs.jar:src clojure.main build.clj

I hope it helps someone, one day.:)

Alright coming back after 5 years.

This error surfaces when one runs clj --main cljs.main --compile hello-world.core --repl from directory or path which does not have file deps.edn or cljs.jar.

Considering the directory structure at ,

hello-world #### Run that command in this directory ├─ src │ └─ hello_world │ └─ core.cljs ├─ cljs.jar └─ deps.edn 

i.e.

$ cd hello-world $ clj --main cljs.main --compile hello-world.core --repl 

If you have created your project using leiningen then your project cli would look something like this

 (defproject clojuredemo "0.1.0-SNAPSHOT" :description "FIXME: write description" :url "" :license {:name "Eclipse Public License" :url ""} :dependencies [[ "1.6.0"]] ) 

After the :dependencies add the following lines

 :jar-name "<project-name>.jar" :jar-path "/target/<project-name>.jar" 

Note : you need the replace the project name with your project

After that run the following command

 lein jar 

Ensure that the JAR file at classpath exists:

java -cp target/missing-file.jar clojure.main your.namespace 

will confusingly throw Could not find or load main class clojure.main.