Jackson xml empty element serialization

Question

I'm having a hard time with this one. Jackson 2.2 XML serializer seems to serialize empty object fields this way:

<field/>

How can I force it to serialize such empty field like this:

<field></field>

Thank you very much for your time and answers.

Community · Accepted Answer · 2017-05-23 11:50:41Z

6

Please, see this question: How do you override the null serializer in Jackson 2.0?. For XmlMapper it could look like below. Create NullSerializer:

class NullSerializer extends JsonSerializer<Object> {

    @Override
    public void serialize(Object value, JsonGenerator jgen, SerializerProvider provider) throws IOException, JsonProcessingException {
        jgen.writeString("");
    }
}

and simple usage:

XmlSerializerProvider provider = new XmlSerializerProvider(new XmlRootNameLookup());
provider.setNullValueSerializer(new NullSerializer());

XmlMapper xmlMapper = new XmlMapper();
xmlMapper.setSerializerProvider(provider);

System.out.println(xmlMapper.writeValueAsString(new Entity()));

Above program prints:

<Entity xmlns=""><field></field></Entity>

edited May 23, 2017 at 11:50

CommunityBot

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answered Nov 21, 2013 at 18:03

Michał Ziober

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