How could I deserialize a JSON property into Java Object in Jackson - jackson

Question

Given this response:
{
"data": {
"id": 38943,
"title": "Appetere Platonem Tempor Interesset Natum",
"description": "epicuri alia atqui",
"visibility": "PUBLIC",
"picture_url": null,
"logo_picture": null,
"owner_id": 51065,
"created_at": "2021-08-16T05:59:15.325Z",
"updated_at": "2021-08-16T05:59:15.325Z",
"counts": {
"subscriptions": 0,
"spots": 0,
"comments": 0,
"impressions": 0,
"respots": 0,
"attachments": 0
},
"user": {
"id": 51065,
"name": "Jon",
"screen_name": "jon",
"url": null,
"location": null,
"profile_picture": null,
"picture_url": null,
"header_picture": null,
"about": null,
"counts": {
"maps": 26
}
},
"map_settings": {
"editor_access": [
"can_none.map",
"can_create.spots",
"can_create.events",
"can_create.comments",
"can_create.attachments",
"can_create.collaborators"
],
"visitor_access": [
"can_none.map",
"can_none.spots",
"can_none.events",
"can_create.comments",
"can_create.attachments",
"can_none.collaborators"
],
"respotting_to_this_map": false
}
},
"meta": {
"code": 200
}
}
How could I deserialize the data property into a MapDTO like this
#JsonIgnoreProperties(ignoreUnknown = true)
#Data
#Builder
#ToString
#NoArgsConstructor
#AllArgsConstructor
public class MapDTO {
private Integer id;
private String title;
private String description;
private String visibility;
#JsonAlias("picture_url")
private String pictureUrl;
#JsonAlias("logo_picture")
private String logoPicture;
#JsonAlias("owner_id")
private Integer ownerId;
#JsonAlias("created_at")
private String createdAt;
#JsonAlias("updated_at")
private String updatedAt;
private MapCountsDTO counts;
#JsonAlias("map_settings")
private MapSettingsDTO mapSettings;
}
I've tried with a custom deserializer, but it looks cumbersome to get all the properties by name and then create a new MapDTO object based on those and the nested objects. If the structure changes I have to change the deserializer and the DTO itself. It would be easier to let Jackson do the deserialization starting from a given root. I'm using Jackson 2.12.4 through RestAssured 4.4.0. I'd like to avoid creating unnecessary wrapper classes.

Answer 1

Try to use jsonshema2pojo
This tool generates models for you.
All you need:
Copy and paste your JSON response to the window
Select on the radio group "Annotation style" radio button "Jackson 2.x"
Click on the "Preview" button
Profit.

Answer 2

Try this? https://json2csharp.com/json-to-pojo
// import com.fasterxml.jackson.databind.ObjectMapper; // version 2.11.1
// import com.fasterxml.jackson.annotation.JsonProperty; // version 2.11.1
/* ObjectMapper om = new ObjectMapper();
Root root = om.readValue(myJsonString), Root.class); */
public class Counts{
public int subscriptions;
public int spots;
public int comments;
public int impressions;
public int respots;
public int attachments;
public int maps;
}
public class User{
public int id;
public String name;
public String screen_name;
public Object url;
public Object location;
public Object profile_picture;
public Object picture_url;
public Object header_picture;
public Object about;
public Counts counts;
}
public class MapSettings{
public List<String> editor_access;
public List<String> visitor_access;
public boolean respotting_to_this_map;
}
public class Data{
public int id;
public String title;
public String description;
public String visibility;
public Object picture_url;
public Object logo_picture;
public int owner_id;
public Date created_at;
public Date updated_at;
public Counts counts;
public User user;
public MapSettings map_settings;
}
public class Meta{
public int code;
}
public class Root{
public Data data;
public Meta meta;
}