CODEWITHSUNDEEP
jacksonobjectmapperjackson-databind
slawek
slawek

Reputation: 61

Jackson annotation @JsonUnwrapped ignores @JsonProperty value

Here's very simple scenario in which I got value object that I want to un-wrap for serialization. Using custom Serializer is not an option.

public class UnwrappedWithPropertyName {

    public static void main(String[] args) throws JsonProcessingException {

        final Address address = new Address(new Postcode("45678"));

        final ObjectMapper mapper = new ObjectMapper();

        System.out.println(mapper.writeValueAsString(address));
    }


    static class Address {

        @JsonUnwrapped
        @JsonProperty("postcode")
        private final Postcode postcode;

        Address(Postcode postcode) {
            this.postcode = postcode;
        }

        public Postcode getPostcode() {
            return postcode;
        }
    }

    static class Postcode {

        private final String value;

        Postcode(String value) {
            this.value = value;
        }

        public String getValue() {
            return value;
        }
    }
}

That will result in 

{"value":"45678"}
and what I would expect is 
{"postcode":"45678"}

Upvotes: 0

Views: 1137

Answers (2)

slawek
slawek

Reputation: 61

By annotating field with @JsonValue one can control the name of such field from enclosing class. 

static class Address {

    @JsonProperty("postcode")
    private final Postcode postcode;

    Address(Postcode postcode) {
        this.postcode = postcode;
    }

    public Postcode getPostcode() {
        return postcode;
    }
}

static class Postcode {

    @JsonValue
    private final String value;

    Postcode(String value) {
        this.value = value;
    }
}

Upvotes: 1

dai
dai

Reputation: 1075

Move @JsonProperty("postcode") to private final String value;

Upvotes: 0

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