Cannot unmarshall using #XmlAttribute - jaxb

Question

I can marshall my sitemap with JAXB, though I cannot unmarshall it! Any help would be much appreciated.
I get the following exception:
javax.xml.bind.UnmarshalException: unexpected element
(uri:"http://www.sitemaps.org/schemas/sitemap/0.9", local:"urlset").
Expected elements are <{}urls>,<{}urlset>
Sitemap urlset:
#XmlRootElement(name = "urlset")
public class XMLURLSet
{
List<XMLURL> urls;
final String xmlns = "http://www.sitemaps.org/schemas/sitemap/0.9";
#XmlAttribute(name = "xmlns")
public String getXmlns() {
return xmlns;
}
public void setXmlns(String xmlns) {
// nop
}
#XmlElement(name = "url")
public List<XMLURL> getUrls(){
return urls;
}
public void setUrls(List<XMLURL> urls) {
this.urls = urls;
}
Sitemap urls:
#XmlRootElement(name = "urls")
public class XMLURL {
String loc;
public String getLoc() {
return loc;
}
public void setLoc(String loc) {
this.loc = loc;
}
}
Output XML (it's correct):
<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
<url>
<loc>http://www.example.com</loc>
</url>
</urlset>
JUnit marshalling code that works
JAXBContext context = JAXBContext.newInstance(XMLURLSet.class);
Marshaller marshaller = context.createMarshaller();
marshaller.setProperty(Marshaller.JAXB_FORMATTED_OUTPUT, Boolean.TRUE);
marshaller.setProperty(Marshaller.JAXB_ENCODING, "UTF-8");
StringWriter sw = new StringWriter();
marshaller.marshal(urlSet, sw);
String xml = sw.toString();
Unmarshalling that DOESNT WORK (cont' from above):
JAXBContext ctx = JAXBContext.newInstance(XMLURLSet.class);
Unmarshaller umsler = ctx.createUnmarshaller();
XMLURLSet xmlUrlSet = (XMLURLSet) umsler.unmarshal(new StreamSource(new StringReader(xml)));
The last line generates the exception:
javax.xml.bind.UnmarshalException: unexpected element (uri:"http://www.sitemaps.org/schemas/sitemap/0.9", local:"urlset"). Expected elements are <{}urls>,<{}urlset>

Answer 1

The problem is with the way you are trying to namespace qualify your document. You will need to add a class called package-info in the same package as your domain classes with the following entry:
package-info
#XmlSchema(
namespace = "http://www.sitemaps.org/schemas/sitemap/0.9",
elementFormDefault = XmlNsForm.QUALIFIED)
package your.package.name;
import javax.xml.bind.annotation.XmlNsForm;
import javax.xml.bind.annotation.XmlSchema;
For More Information
http://blog.bdoughan.com/2010/08/jaxb-namespaces.html