Java 8 Nashorn

Nashorn1.java

package com.winterbe.java8;

import javax.script.Invocable;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;
import javax.script.ScriptException;
import java.io.FileNotFoundException;
import java.io.FileReader;

/**
 * @author Benjamin Winterberg
 */
public class Nashorn1 {

    public static void main(String[] args) throws ScriptException, FileNotFoundException, NoSuchMethodException {
        ScriptEngine engine = new ScriptEngineManager()
                .getEngineByName("nashorn");
        engine.eval(new FileReader("res/script.js"));

        Invocable invocable = (Invocable) engine;
        Object result = invocable.invokeFunction("fun", "Peter Parker");
        System.out.println(result);
    }

}

script.js

var fun = function(name) {
    print('Hi there, ' + name);
    return "success";
};