$ mkdir -p net/dishevelled

$ cat > net/dishevelled/hello.clj
(ns net.dishevelled.hello
  (:gen-class :main true))

(defn -main []
  (println "Hello, world!"))

$ mkdir classes

$ java -cp /usr/local/lib/clojure.jar:classes:. clojure.main -e "(compile 'net.dishevelled.hello)" net.dishevelled.hello

$ java -cp /usr/local/lib/clojure.jar:classes:. net.dishevelled.hello
Hello, world!

$ (cd classes; jar xf /usr/local/lib/clojure.jar)

$ jar cfe hello.jar net.dishevelled.hello -C classes .

$ java -jar hello.jar
Hello, world!