evaluate javascript function with mozilla's rhino

RhinoEval.java

import org.mozilla.javascript.Context;
import org.mozilla.javascript.NativeJavaObject;
import org.mozilla.javascript.Scriptable;

public class RhinoLoader {

    public static void main(String args[]){

        Context ctx = Context.enter();
        try {
            Scriptable scope = ctx.initStandardObjects();

            TestJs testJs = new TestJs();
            scope.put("steps",scope,testJs);

            NativeJavaObject result =(NativeJavaObject) (ctx.evaluateString(scope, "steps.myfunction()","test",1,null)) ;
            System.out.println("result :" +result.unwrap());

        }   finally{
            Context.exit();
        }




    }
}

TestJs.java

public class TestJs {

    public String myfunction(){
        return "1";
    }
}