docs: public void rollback(Xid xid) throws XAException {
  
          JDBCXAResource resource = xaDataSource.getResource(xid);
  
          if (resource == null) {
              throw new XAException(
                  "The XADataSource has no such Xid in prepared state:  " + xid);
          }
  
          resource.rollbackThis();
      }