JAXB without root element - unexpected element (uri:"", local: - javax.xml.bind.UnmarshalException - Expected elements are (none)]

final JAXBContext jaxbContext = JAXBContext.newInstance(ObjectFactory.class); final Unmarshaller jaxbUnmarshaller = jaxbContext.createUnmarshaller(); final JAXBElement element = (JAXBElement) jaxbUnmarshaller .unmarshal(new StringReader(xmlString)); final AcknowledgementType acknowledgementType = element.getValue();