Vars that should be required according to the swagger - are generated as not required.

Description

Vars that should be required according to the swagger - are generated as not required.
I see that it happens only to vars that are type "object".

Swagger-codegen version

2.2.2-SNAPSHOT

Swagger declaration file content or url

"create_ref": {
  "allOf": [
    {
      "$ref": "#/definitions/json_api_version"
    },
    {
      "type": "object",
      "required": [
        "data"
      ],
      "properties": {
        "data": {
          "type": "object",
          "required": [
            "type",
            "id",
            "meta"
          ],
          "properties": {
            "type": {
              "type": "string",
              "enum": [
                "folders",
                "items",
                "versions"
              ]
            },
            "id": {
              "type": "string"
            },
            "meta": {
              "type": "object",
              "required": [
                "extension"
              ],
              "properties": {
                "extension": {
                  "$ref": "#/definitions/base_attributes_extension_object"
                }
              }
            }
          }
        }
      }
    }
  ]
}

Command line used for generation

using java

Steps to reproduce

generate java sdk

Suggest a Fix

You can see in the json that under data there is array of requited vars:
"required": [
"type",
"id",
"meta"
]

but since "meta" is defined as object (I think that is the issue) it is not return in the "getRequired()" method in ModelImpl class.

(The same happens with it's parent "data")

Start with ModelImpl.getRequired() and reproduce the Java SDK generation using the supplied Swagger declaration and command. Trace how required arrays are handled for the object-valued data and meta properties; done means required object variables are included in the generated model metadata as expected.