How to map Dynamic Json Value to Pojo Object using Jackson Parser

Question

{
      "1forge.com": {
        "added": "2017-05-30T08:34:14.000Z",
        "preferred": "0.0.1",
        "versions": {
          "0.0.1": {
            "added": "2017-05-30T08:34:14.000Z",
            "info": {
              "contact": {
                "email": "contact@1forge.com",
                "name": "1Forge",
                "url": "http://1forge.com"
              },
              "description": "Stock and Forex Data and Realtime Quotes",
              "title": "1Forge Finance APIs",
              "version": "0.0.1",
              "x-apisguru-categories": [
                "financial"
              ],
              "x-logo": {
                "backgroundColor": "#24292e",
                "url": "https://api.apis.guru/v2/cache/logo/https_1forge.com_assets_images_f-blue.svg"
              },
              "x-origin": [
                {
                  "format": "swagger",
                  "url": "http://1forge.com/openapi.json",
                  "version": "2.0"
                }
              ],
              "x-providerName": "1forge.com"
            },
            "updated": "2017-06-27T16:49:57.000Z",
            "swaggerUrl": "https://api.apis.guru/v2/specs/1forge.com/0.0.1/swagger.json",
            "swaggerYamlUrl": "https://api.apis.guru/v2/specs/1forge.com/0.0.1/swagger.yaml",
            "openapiVer": "2.0"
          }
        }
      },
      "1password.com:events": {
        "added": "2021-07-19T10:17:09.188Z",
        "preferred": "1.0.0",
        "versions": {
          "1.0.0": {
            "added": "2021-07-19T10:17:09.188Z",
            "info": {
              "description": "1Password Events API Specification.",
              "title": "Events API",
              "version": "1.0.0",
              "x-apisguru-categories": [
                "security"
              ],
              "x-logo": {
                "url": "https://api.apis.guru/v2/cache/logo/https_upload.wikimedia.org_wikipedia_commons_thumb_e_e3_1password-logo.svg_1280px-1password-logo.svg.png"
              },
              "x-origin": [
                {
                  "format": "openapi",
                  "url": "https://i.1password.com/media/1password-events-reporting/1password-events-api.yaml",
                  "version": "3.0"
                }
              ],
              "x-providerName": "1password.com",
              "x-serviceName": "events"
            },
            "updated": "2021-07-22T10:32:52.774Z",
            "swaggerUrl": "https://api.apis.guru/v2/specs/1password.com/events/1.0.0/openapi.json",
            "swaggerYamlUrl": "https://api.apis.guru/v2/specs/1password.com/events/1.0.0/openapi.yaml",
            "openapiVer": "3.0.0"
          }
        }
      },
      "1password.local:connect": {
        "added": "2021-04-16T15:56:45.939Z",
        "preferred": "1.3.0",
        "versions": {
          "1.3.0": {
            "added": "2021-04-16T15:56:45.939Z",
            "info": {
              "contact": {
                "email": "support@1password.com",
                "name": "1Password Integrations",
                "url": "https://support.1password.com/"
              },
              "description": "REST API interface for 1Password Connect.",
              "title": "1Password Connect",
              "version": "1.3.0",
              "x-apisguru-categories": [
                "security"
              ],
              "x-logo": {
                "url": "https://api.apis.guru/v2/cache/logo/https_upload.wikimedia.org_wikipedia_commons_thumb_e_e3_1password-logo.svg_1280px-1password-logo.svg.png"
              },
              "x-origin": [
                {
                  "format": "openapi",
                  "url": "https://i.1password.com/media/1password-connect/1password-connect-api.yaml",
                  "version": "3.0"
                }
              ],
              "x-providerName": "1password.local",
              "x-serviceName": "connect"
            },
            "updated": "2021-07-26T08:51:53.432Z",
            "swaggerUrl": "https://api.apis.guru/v2/specs/1password.local/connect/1.3.0/openapi.json",
            "swaggerYamlUrl": "https://api.apis.guru/v2/specs/1password.local/connect/1.3.0/openapi.yaml",
            "openapiVer": "3.0.2"
          }
        }
      }
    }

Hi I am new to JSON learning and trying to parse the above json into POJO Object "https://api.apis.guru/v2/list.json". I am unable to understand how i should stored the different host name "1forge.com","1password.local:connect" as a field in java class. Any help on above will be really helpful to me

Answer 1

You can use jackson with TypeReference like below, here key of Map object will be host names from your message -

ObjectMapper mapper = new ObjectMapper();
Map<String, Type> map = mapper.readValue(msg,new TypeReference<HashMap<String, Type>>(){});

where Type is pojo as per your message like below -

public class Type {
public String added;
public String preferred;

//all other fields
}