code: public static String objectJsonBody(Object body) {
  		if (body instanceof String)
  			return (String) body;
  		String txt = "";
  		try {
  			txt = mapper.writeValueAsString(body);
  		} catch (JsonProcessingException e) {
  			log.error("objectJsonBody", e);
  		}
  		return txt;
  	}
docs: Convert Object to JSON String
  @param body
  @return a String containing the JSON