public boolean isClosed() throws SQLException {
      throw new SQLFeatureNotSupportedException(resBundle.handleGetObject("cachedrowsetimpl.opnotysupp").toString());
   }
Retrieves whether this ResultSet object has been closed. A ResultSet is closed if the
method close has been called on it, or if it is automatically closed.
@return true if this ResultSet object is closed; false if it is still open
@throws SQLException if a database access error occurs
@since 6.0
src/main/java/org/replicadb/rowset/StreamingRowSetImpl.java