没有名称空间前缀的JAXB XML对象编组

@XmlRootElement(name = "person", namespace = "http://www.example.com/person")
@XmlType(propOrder = { "name", "age" })
public class Person {
    private String name;
    private int age;

    @XmlElement(name = "name")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @XmlElement(name = "age")
    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

Person person = new Person();
person.setName("John Doe");
person.setAge(30);

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

StringWriter sw = new StringWriter();
marshaller.marshal(person, sw);
String xmlString = sw.toString();