DOMResult domResult = new DOMResult();
marshaller.marshal(new JAXBElement<MethodCallMessage>(new QName(MethodCallMessage.class.getSimpleName()),
MethodCallMessage.class, request), domResult);
String input = XmlDecoderFilter.writeDocument(domResult.getNode());
String result = (String) filterChain.filter(input, new HashMap<String, Object>());
Document parseDocument = XmlDecoderFilter.parseDocument(result);
MethodResultMessage value = unmarshaller.unmarshal(parseDocument, MethodResultMessage.class).getValue();
String value2 = unmarshaller.unmarshal((Node) value.getResult().getArg(), String.class).getValue();
value.getResult().setArg(value2);