public Response toResponse(final UpdateServiceException ex) {
final String msg = ex.getMessage();
final MediaType mt = headers.getMediaType();
final ResponseBuilder rb = Response.status(ex.getStatus());
if (APPLICATION_JSON_TYPE.equals(mt))
rb.type(APPLICATION_JSON_TYPE)
.entity('"' + msg + '"');
else if (APPLICATION_XML_TYPE.equals(mt))
rb.type(APPLICATION_XML_TYPE)
.entity(new JAXBElement<String>(message, String.class, msg));
else if (TEXT_XML_TYPE.equals(mt))