How Can I Successfully Call Clojure Functions from Java?

Calling Clojure from Java

. Intro.

Calling Clojure from Java can be tricky since most Google suggestions are outdated. This article provides clear steps to make this call, assuming you have built a JAR from a Clojure project and added it to the classpath.

. Calling Clojure.

To successfully call Clojure from Java, use these steps:

1. Declare the namespace with :gen-class for creating a Java class and :methods for specifying methods callable by Java.
2. Create a wrapper function (-binomial in this example) that can be called by Java.
3. Include the Clojure JAR in the classpath.

. Updated Example.

Clojure Part:

(ns com.domain.tiny
  (:gen-class
    :name com.domain.tiny
    :methods [#^{:static true} [binomial [int int] double]]))

(defn binomial
  "Calculate the binomial coefficient."
  [n k]
  ...)

(defn -binomial
  "A Java-callable wrapper around the 'binomial' function."
  [n k]
  (binomial n k))

Java Part:

import com.domain.tiny;

public class Main {

    public static void main(String[] args) {
        System.out.println("(binomial 5 3): " + tiny.binomial(5, 3));
        System.out.println("(binomial 10042, 111): " + tiny.binomial(10042, 111));
    }
}

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