Clarification on additionalProperties expected behavior with Swagger-Codegen

[Bjorn Sayers]

I'm using the swagger-editor and the swagger-codegen tools to generate a client API.  I have defined Person model in my yaml as follows:

  Person:

    properties:

      firstname:

        type: string

        description: First Name

      lastname:

        type: string

        pattern: "^zz"

        description: Last Name

      email:

        type: string

        description: Email of the person

    additionalProperties: {"type":"object"}

When I generate the java code I get something like the following:

public class Person extends HashMap  <String, Object> {

  private String firstname = null;

  private String lastname = null;

  private String email = null;

//get and setters etc

}

When I use the the generated code to call my api all of the properties in my json are getting copied into the 'catch-all' map of the Person object; this is to say that something like {"lastname":"someLastname"} gets stored into the map instead of setting 'someLastname' on the private lastname variable.  I was hoping that additionalProperties would only be used for items not specified in my model object - this is to say I was hoping if firstname, lastname etc were present in my json the parser would populate these as opposed to the map.  I am manually able to get something like this to work by using @JsonAnySetter annotation and adding my own 'map,' however I was wondering if there is a way to get the swagger codegen to do something similar or if perhaps I am misunderstanding the expected behavior of the 'additionalProperties' attribute.  I did look at some other threads and could not find anything directly, but feel free to simply point me to existing resources.

TIA