How to get the row Count of a ResultSet

Hi
I'v tried rennie1's way ,but I only get zero,my code is:
rs.executeQuery("select count(*) from t_test");
if (rs.next()) int rowCount=rs.getInt(1);
I also tried barni's way ,but the method rs.last() and rs.beforeFirst() throw a same Exception
I tried another way,the code is:
while rs.next(){
// Do nothing ,just move the cursour to the last row
int rowCount=rs.getRow()
However,the rowCount still equal zero
Any help would be greatly apprecite!
note:
I get connection by DataSource's JNDI name from client, the Server is Weblogic Server 6, the DBMS is Oracle.

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