Java JAXB:缺少命名空间

我试图从通过JAXB生成的类序列化XML

班级：

package ws.avail;

@XmlAccessorType(XmlAccessType.FIELD)
@XmlType(name = "", propOrder = {
    "pos",
    "uniqueID",
    "availStatusMessages"
})
@XmlRootElement(name = "OTA_HotelAvailNotifRQ")
public class OTAHotelAvailNotifRQ {
 ...
}

文件“package info.java”：

封送拆收器（简化而无错误处理）：

此代码生成：

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>  
<OTA_HotelAvailNotifRQ Version="1.000" Target="TEST">  
....

....

我期待这样的事情：

<?xml version="1.0" encoding="UTF-8"?>  
<OTA_HotelAvailNotifRQ xmlns="http://www.opentravel.org/OTA/2003/05" Version="1.000" Target="TEST">  
....

....

---

我有一个类似的代码，工作正常，但我不明白为什么这段代码不显示名称空间。有线索吗？谢谢

您的映射是正确的

我试用了你的模型，它对我很有用：

演示

package ws.avail;

import java.io.StringWriter;
import javax.xml.bind.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        OTAHotelAvailNotifRQ rootElement = new OTAHotelAvailNotifRQ();
        StringWriter stringWriter = new StringWriter();

        JAXBContext context = JAXBContext.newInstance(rootElement.getClass());
        Marshaller marshaller = context.createMarshaller();
        marshaller.marshal(rootElement, stringWriter);
        System.out.println(stringWriter.toString());
    }

}

输出

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><OTA_HotelAvailNotifRQ xmlns="http://www.opentravel.org/OTA/2003/05"/>

---

解决方案

通常当出现此问题时，

包信息

类未编译或未与应用程序打包

---

了解更多信息

package ws.avail;

import java.io.StringWriter;
import javax.xml.bind.*;

public class Demo {

    public static void main(String[] args) throws Exception {
        OTAHotelAvailNotifRQ rootElement = new OTAHotelAvailNotifRQ();
        StringWriter stringWriter = new StringWriter();

        JAXBContext context = JAXBContext.newInstance(rootElement.getClass());
        Marshaller marshaller = context.createMarshaller();
        marshaller.marshal(rootElement, stringWriter);
        System.out.println(stringWriter.toString());
    }

}

<?xml version="1.0" encoding="UTF-8" standalone="yes"?><OTA_HotelAvailNotifRQ xmlns="http://www.opentravel.org/OTA/2003/05"/>