code: public boolean isSameRM(XAResource xares) throws XAException {
  
          if (!(xares instanceof JDBCXAResource)) {
              return false;
          }
  
          return xaDataSource == ((JDBCXAResource) xares).getXADataSource();
      }
docs: Stub.  See implementation comment in the method for why this is
  not implemented yet.
  
  @return false.