Solved by adding
@XmlSchema(
namespace = "http://www.example.com/a",
elementFormDefault = XmlNsForm.QUALIFIED,
xmlns = {
@XmlNs(prefix="ns1", namespaceURI="http://www.example.com/a")
}
)
package authenticator.beans.login;
import javax.xml.bind.annotation.*;
in package-info.java
Took help of jaxb-namespaces-missing : Answer provided by Blaise Doughan