docs: public void commitThis(boolean onePhase) throws XAException {
  
          if (onePhase && state == XA_STATE_PREPARED) {
              throw new XAException(
                  "Transaction is in a 2-phase state when 1-phase is requested");
          }
  
          if ((!onePhase) && state != XA_STATE_PREPARED) {
              throw new XAException("Attempt to do a 2-phase commit when "
                                    + "transaction is not prepared");
          }
  
          //if (!onePhase) {
          //  throw new XAException(
          //   "Sorry.  HSQLDB has not implemented 2-phase commits yet");
          //}
          try {
  
              /**
               * @todo:  Determine if work was committed, rolled back, or both,
               * and return appropriate Heuristic*Exception.
               * connection.commit();
               *  Commits the real, physical conn.
               */
              connection.commit();
          } catch (SQLException se) {
              throw new XAException(se.getMessage());
          }
  
          dispose();
      }