Unable to return a JSONObject field of a class properly-CodePudding

I have a DTO like below:

@Getter
@Setter
@AllArgsConstructor
public class LightRoundResponse {
    private String round;
    private JSONObject fields;
}

I am able to store and fetch the JSON Object from the DB. After setting DTO's fields attribute with the ResultSet's fields, I am able to see the JSONObject containing the correct data while debugging.

However the response which I get is:

{
    "round": "A Round",
    "fields": {
        "empty": false
    }
}

fields object is incorrect, I think since it's a JSONObject it could be an issue but I am not sure. How can I get the correct response and not "empty": false

CodePudding user response：

Converting the JSONObject to Map does the job.

Example:

public class LightRoundResponse {
    private String round;
    private Map fields;

    public void setFields(JSONObject fields){
        this.fields = fields.toMap();
    }
}

I hope I could understand why JSONObject doesn't works, but seems like the community isn't aware also. Hence posting a workaround, could help people facing the same issue.

CodePudding user response：

Jackson does not know how to serialize JSONObject class. The expected way to do that is to actually use Map<String, Object>:

@Getter
@Setter
@AllArgsConstructor
public class LightRoundResponse {
    private String round;
    private Map<String, Object> fields;
}