* metadata remains the same. Only four new rows which are the same as
* the original data in WebRowSet are added.
*/
WebRowSet webRs = newWebRowSet();
rs = st.executeQuery("SELECT * FROM USER_INFO");
webRs.populate(rs);
ResultSetMetaData meta = webRs.getMetaData();
// register listener
Listener listener = new Listener();
webRs.addRowSetListener(listener);
assertNull(listener.getTag());