docs: public int getPollHeartbeatRetries() {
  
          int retries = POLL_RETRIES_DEFAULT;
  
          try {
              retries = Integer.getInteger(
                  HsqlDatabaseProperties.system_lockfile_poll_retries_property,
                  retries).intValue();
          } catch (Exception e) {}
  
          if (retries < 1) {
              retries = 1;
          }
  
          return retries;
      }