@Override
        public String toString() {
            return json.toString();
        }
Pass in a Map and this method will return a JSON string.

<p>The map can contain Objects, int[], Object[] and Collections and they will be converted
into string representations.

<p>Nested maps can be included as values and the JSON will have nested object notation.

<p>Arrays/Collections can have Maps in them as well.

<p>See the unit tests for examples.

@param jsonData
zuul-core/src/main/java/com/netflix/zuul/util/JsonUtility.java