RunScript.java

import java.util.concurrent.Callable;
import org.mozilla.javascript.Context;
import org.mozilla.javascript.Scriptable;

public class RunScript {
    public static void main(String args[]) throws Exception {
        System.out.println(callable().call());
    }

    static Callable callable() {
        Context cx = Context.enter();
        try {
            Scriptable scope = cx.initStandardObjects();
            String s = "new java.util.concurrent.Callable({call: function(){return [1,2,3].join(',');}})";
            Object x = cx.evaluateString(scope, s, "<cmd>", 1, null);
            return (Callable)(Context.jsToJava(x, Callable.class));
        } finally {
            Context.exit();
        }
    }
}