code: @Override
      public List<Object> checkForErrors(Object[] objs) {
          List<Object> errors = new ArrayList<Object>();
          if (objs != null) {
              for (int cont = 0; cont < objs.length; cont ++) {
                  if (objs[cont] == null) {
                      logger.debug("A operation could not be performed.");
                      errors.add(objs[cont]);
                  }
              }
          }
          return errors;
      }
docs: Checking for errors after operations have been processed.
  @param objs
  @return