Soap With SwaRef Not Working

@WebService
@SOAPBinding(style = Style.DOCUMENT)
public interface ImageServerSwa {

Path PATH_UPLOAD = Paths.get("/", "home", "ankur", "soap", "kotak.jpg");

Path PATH_DOWNLOAD = Paths.get("/", "home", "ankur", "Pictures", "kotak.jpg");

//download a image from server
@WebMethod
@XmlAttachmentRef
DataHandler downloadDataHandler();

@WebMethod
void uploadDataHandler(@XmlAttachmentRef DataHandler dataHandler);

}

@WebService(endpointInterface = "com.github.ankurpathak.soap.ImageServerSwa")
public class ImageServerSwaImpl implements ImageServerSwa {

@Override
@XmlAttachmentRef
public DataHandler downloadDataHandler() {
File file = PATH_DOWNLOAD.toFile();
FileDataSource dataSource = new FileDataSource(file);
DataHandler dataHandler = new DataHandler(dataSource);
return dataHandler;
}

@Override
public void uploadDataHandler(@XmlAttachmentRef DataHandler data) {
if (data != null) {
File file = PATH_UPLOAD.toFile();
try {
FileUtils.copyInputStreamToFile(data.getInputStream(), file);
} catch (IOException ex) {
throw new WebServiceException();
}
}
}

}