code: public java.util.List<SendMessageBatchResultEntry> getSuccessful() {
          if (successful == null) {
              successful = new com.amazonaws.internal.SdkInternalList<SendMessageBatchResultEntry>();
          }
          return successful;
      }
docs: <p>
  A list of <code> <a>SendMessageBatchResultEntry</a> </code> items.
  </p>
  
  @return A list of <code> <a>SendMessageBatchResultEntry</a> </code> items.