Deserializing nested json object with Jackson

Question

I would like to ask you guys how to deserialize nested object with jackson. I got example Json File:

{ "id": "1", "comment": "Some comment", "user": "Smith", "date": "2018-05-31", "shape": "oval", "coordinates": [ ["50", "130"], ["370", "500"] ] },

Let's say that main Class is called Comment, but I would like to create another class Coordinates with local variables x1, x2, y1, y2. So class Comment looks like that:

 public class CommentFile implements Serializable{ private Long id; private String comment; private String user; private String date; private String shape; private Coordinates coordinates; //setters, getters, constructor

But because in json i have 'array' "coordinates": [ ["50", "130"], ["370", "500"] ], i dont know how to convert this to:

public class Coordinates implements Serializable{ private double x1; private double y1; private double x2; private double y2;

Any ideas?

St1id3r · Accepted Answer · 2018-05-30 23:51:06Z

A straightforward way is to use List<List<String>> coordinates; to deserialize the JSON to Java first. Later, you can implement a method something like getCoordinatesObject() inside CommentFile class to create and get a Coordinates object.

There might be a better way to accomplish this directly with Jackson but you can do this as well.

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