CODEWITHSUNDEEP
javajsonserializationjackson
Gleidosn
Gleidosn

Reputation: 301

serialize interface fields using com.fasterxml.jackson.databind.ObjectMapper

serialize in json result? How do I serialize or field the interface in json result. I using com.fasterxml.jackson.databind.ObjectMapper.writeValueAsString(obj).

The interface field not showing in json result



    @JsonTypeInfo(use = JsonTypeInfo.Id.NAME, include = JsonTypeInfo.As.PROPERTY, property = "type")
    @JsonSubTypes({ 
        @Type(value = TranslateEN.class, name = "en"),
        @Type(value = TranslatePT.class, name = "pt")
    })
    public interface ITranslate extends Serializable {

        String app = "Anota Ai";

    }

    @XmlRootElement
    public final class TranslatePT implements ITranslate {

        private static final long serialVersionUID = 1L;

        private static TranslatePT instance;

        private TranslatePT() {
            super();
        }

        static {
            instance = new TranslatePT();
        }

        public static TranslatePT getInstance() {
            return instance;
        }

        public final Message message = new Message();
        public final Entidade entidade = new Entidade();

        final static class Message {
            public final String defultError = "Erro inesperado";
        }

        final static class Login {
            public final String forbidden = "Sessão expirada, favor efetuar o login novamente.";
            public final String confirmacaoSenha = "A senha não confere com a confirmação de senha. Informe novamente.";
        }

        final static class Entidade {
            public final EntidadeDeletada editada = new EntidadeDeletada();
        }

        final static class EntidadeDeletada {
            public final String sucesso = "{0} editada com sucesso.";
        }

    }


    public class MessageSerialize {

        @Test
        public void loadHtmlFileTest() throws IOException {
            ObjectMapper objectMapper = new ObjectMapper();
            TranslatePT instanceTranslate = TranslatePT.getInstance();
            String dtoAsString = objectMapper.writeValueAsString(instanceTranslate);
            Assert.assertNotNull(dtoAsString);
        }

    }
    //result of serialization
    {"type":"pt","message":{"defultError":"Erro inesperado"},"entidade":{"editada":{"sucesso":"{0} editada com sucesso."}}}

Upvotes: 1

Views: 895

Answers (2)

Manos Nikolaidis
Manos Nikolaidis

Reputation: 22234

As Luciano points out (implicitly) static fields are not serialized by Jackson even if you use appropriate annotations. However, Jackson will by default call all getter methods it finds and put the return values in the JSON with a field name derived from getter name. So if you must serialize a static field app just put a getter method named getApp in a class, in this case TranslatePT:

public String getApp() {
    return app;
}

Upvotes: 2

Luciano van der Veekens
Luciano van der Veekens

Reputation: 6577

The app variable in the interface is not an instance field, but a constant. Fields in interfaces are implicitly public static final.

Constants are associated with the class, they are not part of an instance. Jackson only serializes object instances to JSON and hence won't serialize the statics.

Upvotes: 2

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