杰克逊XmlMaaper无法解码null Double

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.core.JsonProcessingException;
import com.fasterxml.jackson.databind.DeserializationContext;
import com.fasterxml.jackson.databind.JsonDeserializer;

import java.io.IOException;

public class NullDoubleDeserializer extends JsonDeserializer<Double> {
    @Override
    public Double deserialize(JsonParser jsonParser, DeserializationContext deserializationContext) throws IOException, JsonProcessingException {
        String value = jsonParser.getText();
        if (value.isEmpty()) {
            return null;
        } else {
            return Double.parseDouble(value);
        }
    }
}

import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.dataformat.xml.XmlMapper;
import com.fasterxml.jackson.databind.module.SimpleModule;

public class XmlMapperExample {
    public static void main(String[] args) throws JsonProcessingException {
        ObjectMapper objectMapper = new XmlMapper();
        SimpleModule module = new SimpleModule();
        module.addDeserializer(Double.class, new NullDoubleDeserializer());
        objectMapper.registerModule(module);

        // 使用XmlMapper进行XML到Java对象的转换
        MyObject myObject = objectMapper.readValue(xmlString, MyObject.class);

        // 使用XmlMapper进行Java对象到XML的转换
        String xmlString = objectMapper.writeValueAsString(myObject);
    }
}