How to send list of objects through POST mapping using Postman?

Question

I am using Postman to send a post request with the following controller (which doesn't work)

@RequestMapping(value="/updateData", method=RequestMethod.POST, consumes = MediaType.APPLICATION_JSON, produces = MediaType.APPLICATION_JSON)
public int updateData(@RequestBody FriendInfoForm request);

and I want this type of payload to be accepted as a "request" object.

{
    "name": "John",
    "age": 27,
    "friendList": [
        {
            "name": "Jack",
            "age": 20
        },
        {
            "name": "Jill",
            "age": 21
        }
    ]
}

and this is the FriendInfoForm definition:

public class FriendInfoForm {
    private String name;
    private int age;
    private ArrayList friendList;
    (getters and setters)
}

When I try to send the post request, name and age get set correctly, but friendList doesn't (it doesn't get set to anything). I can guess why (has to do with the Arraylist use).

How do I send it correctly?

Answer 1

you should create POJO like below class:--

public class FriendInfoForm {
    
    private String name;
    private int age;

    @JsonProperty("friendList")
    private List<FriendList> friendList = new ArrayList<>();;
    (getters and setters)
}

public class FriendList{
 private String name;
    private int age;
(getters and setters)
}
}