code: public static void checkNotEmpty(Object value, String fieldName) throws AlipayApiException {
  		if(value==null){
              throw new AlipayApiException(ERROR_CODE_ARGUMENTS_MISS,
                  "client-error:Missing Required Arguments:" + fieldName + "");
  		}
  		if(value instanceof String){
  			if(((String) value).trim().length()==0){
                  throw new AlipayApiException(ERROR_CODE_ARGUMENTS_MISS,
                      "client-error:Missing Required Arguments:" + fieldName + "");
  			}
  		}
  	}
docs: Invalid Arguments