如何使用JAXB在Java中为XML中的int值放置一个空体？

import javax.xml.bind.annotation.XmlRootElement;

@XmlRootElement
public class DataModel {
    private Integer value;

    public Integer getValue() {
        return value;
    }

    public void setValue(Integer value) {
        this.value = value;
    }
}

import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import java.io.StringWriter;

public class Main {
    public static void main(String[] args) {
        DataModel dataModel = new DataModel();
        // 设置int值为空
        dataModel.setValue(null);

        try {
            JAXBContext jaxbContext = JAXBContext.newInstance(DataModel.class);
            Marshaller marshaller = jaxbContext.createMarshaller();
            marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, true);

            StringWriter writer = new StringWriter();
            marshaller.marshal(dataModel, writer);

            String xml = writer.toString();
            System.out.println(xml);
        } catch (JAXBException e) {
            e.printStackTrace();
        }
    }
}