JSON.stringify on Java object

[Viktor Gamov]

Hello Nashorn team,

I have a question regarding conversion java object to json using 
JSON.stringify. Is it possible?
Here is my test method

@Test
public void convertToJson() throws ScriptException, NoSuchMethodException {
    Person person = new Person();
    person.setFirstName("Vik");
    person.setLastName("Gamov");
    person.setSsn("111-11-11");
    Invocable invocable = (Invocable) engine;
    Object x = invocable.invokeMethod(engine.eval("JSON"), "stringify", person);
    System.out.println(x);
}

Prints null. Please advise.

Thanks          

-- 
With Best Regards, 
Vik Gamov