code: public String getMessage() {
      StringBuffer result = new StringBuffer();
      Iterator<IOException> itr = problems.iterator();
      while(itr.hasNext()) {
        result.append(itr.next().getMessage());
        if (itr.hasNext()) {
          result.append("\n");
        }
      }
      return result.toString();
    }
docs: Get a summary message of the problems found.
  @return the concatenated messages from all of the problems.