Working With Arbitrary JSON Data in Spring Boot [duplicate]

Question

I am quite new to Spring Boot and REST API. I am trying to build a simple REST API that deals with arbitrary JSON data. I got it working to the point where I can use GET and POST.

What I would want to achieve is to send the same data back with an additional field added. If the data is this(Can be arbitrary).

{
    "firstname" : "Dheeraj",
    "lastname"  : "Dhall"
}

I would want something like this back.

{
    "id": "1"
    "firstname" : "Dheeraj",
    "lastname"  : "Dhall"
}

The method that handles PUT request has JsonNode as the parameter and my model is something like this

public class Person {
    private Long id;
    private Map<String, String> map;
}

So in the method that handles the PUT request I create a map and load data from the JSON Object. So the problem is that my response is something like this

{
    "id": "1"
    "map":{
             "firstname" : "Dheeraj",
             "lastname"  : "Dhall"
          }
}

How do I get it to print without a "map"? what is the best way to handle arbitrary JSON data?

In your Person class annotate Map<String, String> map getter with @JsonAnyGetter annotation. See also: How to use dynamic property names for a Json object, Dynamic change of JsonProperty name, Why I'm not able to unwrap and serialize a Java map? — Michał Ziober
– Michał Ziober, Commented Nov 23, 2019 at 8:30
If the data is arbitrary then there it will not work with nested JSON if the map is Map<String, String>. I tried changing it to Map<String, Object> but hibernate throws an error stating it cannot determine the number of columns. Is there a work around this? — Dheeraj Dhall
– Dheeraj Dhall, Commented Nov 27, 2019 at 6:02

Thuat Nguyen · Accepted Answer · 2019-11-23 02:17:51Z

0

Why do you need to use Map in your Person class? I think you don't need to use Map in this case, you can change your Person class like below:

public class Person {
    private Long id;
    private String firstname;
    private String lastname;
}

answered Nov 23, 2019 at 2:17

Thuat Nguyen

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1 Comment

Dheeraj Dhall Over a year ago

The data that I receive is arbitrary. There can be multiple fields, I gave that as an example.

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