Question

java -cp clojure.jar clojure.main compile.clj this is compiling the clojure code.
javac CalculateSum.java compiling java code.
jar cvf sum.jar *.class getting jar file of class files.

java CalculateSum is running main and giving output correctly.
How to run jar file from java environment?
like java -cp clojure.jar;sum.jar clojure.main CalculateSum where CalculateSum is main class.

sample code
_utils.clj_

(ns utils
(:gen-class :name Utils
:methods [#^{:static true} [sum [java.util.Collection] long]]))
(defn sumx [coll] (reduce + coll))
(defn -sum [coll] (sumx coll))

compile.clj

(set! *compile-path* "./")
(compile 'utils)

CalculateSum.java
public class CalculateSum {
public static void main(String[] args) {
java.util.List<Integer> xs = new java.util.ArrayList<Integer>();
xs.add(10);
xs.add(5);
System.out.println(Utils.sum(xs));
}
}

Aim is to craete jar file out of this code. and run jar file

java should call clojure code, execute it and print result

Answer 1

Okay, so there are two things:

• To run it just from a jar file rather than making it an executable jar file, you should be fine with just:

  java -cp sum.jar CalculateSum
  

  or possibly (if it needs classes from closure.jar at execution time)

  java -cp closure.jar;sum.jar CalculateSum
  

• To turn it into an executable jar file which you can run with

  java -jar sum.jar
  

  you’ll need a manifest file including a Main-Class attribute letting you set the entry point, and possibly a Class-Path attribute to add the closure.jar file to the jar’s classpath.

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