private String buildJsonUsername() {
        Iterator<String> iterator = getUserName().iterator();
        JsonArrayBuilder jsonArrayBuilder = Json.createArrayBuilder();
        while (iterator.hasNext()) {
            jsonArrayBuilder.add((String) iterator.next());
        }
        System.out.println("User Array " + Json.createObjectBuilder().add("users", jsonArrayBuilder).build().toString());
        return Json.createObjectBuilder().add("users", jsonArrayBuilder).build().toString();
    }