In my response object, I can easily add a map that Jackson will serialise e.g.

public class Response {
    String firstName;
    String lastName;
    Map map = ...

}

The JSON will be

{
    "firstName": "tony",
    "lastName": "lastName",
    "map": {}
}

But say I don't want the word map and I want to dynamically add name value pairs so they are at the same level as firstName and lastName, how do I do that? Really don't want to extend Map.

Thanks