Get API response schema from an oas2 file

Below is the spec which I'm trying to parse.

  "swagger": "2.0",
  "info": {
    "title": "Test API",
    "version": "1.0",
    "description": "test",
    "contact": {
      "name": "Test",
      "url": "https://www.example.com/"
    }
  },
  "host": "example.com",
  "paths": {
    "/todos": {
      "get": {
        "responses": {
          "200": {
            "description": "",
            "schema": {
              "type": "object",
              "properties": {
                "id": {
                  "type": "string"
                },
                "name": {
                  "type": "string"
                },
                "dob": {
                  "type": "string"
                },
                "internalObject": {
                  "$ref": "#/definitions/test-model"
                }
              },
              "required": [
                "id",
                "name"
              ]
            }
          }
        },
        "summary": "Todos API summary",
        "description": "Todos description",
        "operationId": "getTodos",
        "tags": [
          "Todo"
        ]
      }
    }
  },
  "tags": [
    {
      "name": "Todo"
    }
  ],
  "schemes": [
    "http"
  ],
  "definitions": {
    "test-model": {
      "type": "object",
      "title": "Test Model",
      "properties": {
        "field1": {
          "type": "string"
        },
        "field2": {
          "type": "string"
        }
      }
    }
  },
  "responses": {
    "todos-response": {
      "description": "todos response object",
      "schema": {
        "type": "object",
        "properties": {
          "id": {
            "type": "string"
          },
          "name": {
            "type": "string"
          },
          "dob": {
            "type": "string"
          },
          "internalObject": {
            "$ref": "#/definitions/test-model"
          }
        },
        "required": [
          "id",
          "name"
        ]
      }
    }
  }
}

The library I'm using:

implementation 'io.swagger.parser.v3:swagger-parser:2.0.19'

I have the spec as a String. So, my code is like below:

OpenAPIParser openApiParser = new OpenAPIParser();
ParseOptions options = new ParseOptions();
options.setResolve(true);
options.setFlatten(true);
SwaggerParseResult sr = openApiParser.readContents(spec, null, options);	

I have tried to print the schema in couple of ways, but I didn't get the schema as I expected.

Option 1:

Map<String, io.swagger.v3.oas.models.media.MediaType> map = apiResponse.getContent();
   for (String key : map.keySet()) {
	System.out.println("schema = " + map.get(key).getSchema().toString());
       }

Option 2:

ApiResponse apiResponse1 = sr.getOpenAPI().getComponents().getResponses().get("todos-response");
	
Map<String, io.swagger.v3.oas.models.media.MediaType> responsesMap = apiResponse1.getContent();
for (String key : responsesMap.keySet()) {
  System.out.println("response schema = " + responsesMap.get(key).getSchema().toString());
}

I'm trying to get schema in this format so that I can use it to validate against my API response.

{
  "type": "object",
  "properties": {
    "id": {
      "type": "string"
    },
    "name": {
      "type": "string"
    },
    "dob": {
      "type": "string"
    },
    "internalObject": {
      "type": "object",
      "title": "Test Model",
      "properties": {
        "field1": {
          "type": "string"
        },
        "field2": {
          "type": "string"
        }
      }
    }
  },
  "required": [
    "id",
    "name"
  ]
}

Please let me know, if I need to try anything else or other parsers.
Thanks.

Start with OpenAPIParser.readContents using the provided OAS2 string and inspect the parsed operation response rather than only the components response map. Compare the resolved response schema and its $ref to the requested nested JSON shape; done means documenting or implementing a supported way to obtain that schema for response validation, with an appropriate parser test if the repository provides one.