Overloaded setters on Jackson object

Question

I'm not sure if this is possible, but I'd like to have an overloaded setter on a Jackson deserializable object. So that depending on the object in that field it deserializes differently.

Example

public class Thing {
    private MyObject1 object;

    public MyObject1 getObject() {
        return object;

    public void setObject(MyObject1 object) {
        this.object = object;
    }

    public void setObject(MyObject2 object) {
        this.object = translate1To2(object);
    }
}

If this is not possible, would someone offer me an alternative approach? My concern is that in the simple case where there is only one setter, Jackson doesn't have to choose which object to deserialize the JSON as, so not sure if it even can.

UPDATE: The above gives a com.fasterxml.jackson.databind.JsonMappingException: Conflicting setter definitions for property "object" as is.

Possible duplicate of [How do I call the default deserializer from a custom deserializer in Jackson](https://stackoverflow.com/questions/18313323/how-do-i-call-the-default-deserializer-from-a-custom-deserializer-in-jackson) — Gautam Chibde, Oct 30 '18 at 08:59

jrey · Answer 1 · 2018-10-29T19:18:59.120

1

The best way, I think is add a Custom Deserialization class

@JsonDeserialize(using = ThingDeserializer.class)
public class Thing {
...
}

Example of deserialization here https://www.baeldung.com/jackson-deserialization

Then, your bean will be ever clean, and you make your own JSON as you want to have

edited Oct 29 '18 at 19:18

answered Oct 29 '18 at 19:12

jrey

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1

Very similar, see my eventual solution below. – MiketheCalamity Oct 30 '18 at 07:45

score 0 · Accepted Answer · answered Oct 30 '18 at 07:44

Because you cannot actually overload setters like this in Jackson, my solution was as follows:

I made a deserializer to translate MyObject2 to MyObject1 and had one setter, so my class looked like this:

public class Thing {

    @JsonDeserialize(using = MyObjectDeserializer.class)
    private MyObject1 object;

    public MyObject1 getObject() {
        return object;

    public void setObject(MyObject1 object) {
        this.object = object;
    }
}

Overloaded setters on Jackson object

2 Answers2