Question

I’d like to have two main classes (or more) with leiningen, and then be able to choose which one at the java command line. For example I have:

(ns abc (:gen-class))
(defn -main [] (println "abc"))

(ns def (:gen-class))
(defn -main [] (println "def"))

With a project.clj having:

(defproject my-jar "0.0.1"
 :description "test"
 :dependencies [
 ]
 :main abc)

Then I build with lein uberjar, and run:

java -cp my-jar-0.0.1-standalone.jar abc
java -cp my-jar-0.0.1-standalone.jar def

I get it that when I specified :main abc in the project.clj it was calling that out as the main-class in the manifest, but I couldn’t get it to run without putting something. But either way when I try to run the ‘def’ main, I get a class not found:

Exception in thread "main" java.lang.NoClassDefFoundError: def

Answer 1

I added :aot [abc def] to the project.clj to generate compiled code and it worked.