JAXB 和属性排序

我希望 Java 类的序列化 XML 输出遵循 Java 类中属性的顺序。

JAXB似乎按字母顺序排序。

我可以通过使用 propOrder 并指定所有属性来重写它，但是我有一个具有许多属性的类，这些属性尚未最终确定。@XmlType

我读到指定一个空的propOrder可以做到这一点，但它没有。

我的示例类：

package test;

import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlType;

@XmlRootElement
//@XmlType(propOrder={"company", "scheme", "agreementNumber"})
@XmlType(propOrder={}) // makes no difference - still alphabetical in XML 
public class CustomerPlan2 {

    private String company;
    private String scheme;
    private String agreementNumber;

    @XmlElement(name="Company")
    public String getCompany() {
        return company;
    }
    public void setCompany(String company) {
        this.company = company;
    }

    @XmlElement(name="Scheme")
    public String getScheme() {
        return scheme;
    }
    public void setScheme(String scheme) {
        this.scheme = scheme;
    }

    @XmlElement(name="AgreementNumber")
    public String getAgreementNumber() {
        return agreementNumber;
    }
    public void setAgreementNumber(String agreementNumber) {
        this.agreementNumber = agreementNumber;
    }
}

我的序列化代码：

    CustomerPlan2 cp2 = new CustomerPlan2();

    cp2.setCompany("company");
    cp2.setScheme("scheme");
    cp2.setAgreementNumber("agreementnumber");
    JAXBContext context = JAXBContext.newInstance(CustomerPlan2.class);
    Marshaller marshaller = context.createMarshaller();

    marshaller.marshal(cp2, new FileWriter("C:\\temp\\out.xml"));

输出：

    <customerPlan2>
      <AgreementNumber>agreementnumber</AgreementNumber> 
      <Company>company</Company> 
      <Scheme>scheme</Scheme> 
    </customerPlan2>

我希望我的输出是（作为我的类的属性顺序）：

    <customerPlan2>
      <Company>company</Company>
      <Scheme>scheme</Scheme> 
      <AgreementNumber>agreementnumber</AgreementNumber> 
    </customerPlan2>

感谢您对此的任何帮助。