docs: public int rollback() {
        //log rolling back
        loggingDecision(false);
  
        //perform rollback
        try {
           tx.rollback();
        } catch (SystemException e) {
           //ignore exception (heuristic exceptions)
           //TODO logging
        } finally {
           perCacheTxTable.removeLocalTx(xid);
        }
  
        //log rolled back
        loggingCompleted(false);
        return XAException.XA_RBROLLBACK;
     }