Deserializing json response to custom enum value in java

Question

I am trying to deserialize a JSON response with custom enum values, but instead of mapping with the custom value, the enum is being set with its ordinal value. I have searched a lot and I can not figure out what I am doing wrong. Any help would be great.

The response is

{"id":12, "status":1}

Corresponding enum object and enum is

public class Car {
   int id;
   CarStatus status;
}


public enum CarStatus {
    
    READY(1),
    WAITING(2);

    private int value;

    CarStatus(int value) {
        this.value = value;
    }

    @JsonValue
    public int getValue() {
        return value;
    }

}

The status is set to WAITING, but I expect it to be set to READY.

Answer 1

your enum miss @JsonCreator

try like this:

public enum CarStatus {
    
    READY(1),
    WAITING(2);

    private int value;

    CarStatus(int value) {
        this.value = value;
    }

    @JsonValue
    public int getValue() {
        return value;
    }

    @JsonCreator
    public static CarStatus getItem(int code){
        for(CarStatus item : values()){
            if(item.getValue() == code){
                return item;
            }
        }
        return null;
    }
}

you can see my code in github: https://github.com/onemaomao/java-common-mistakes/tree/master/src/main/java/org/geekbang/time/questions/stackoverflow/reslove/q1