New to Java

in following code i want to retreive the maximum serial number from Serial column and return it to caller .

          String query;
          query = "select MAX(Serial) from CMS..CMSLog";
          Statement st = con.createStatement();
           ResultSet rs = st.executeQuery(query);
           while (rs.next())
           {
            logserial = rs.getInt("1");
            }
           
           rs.close();
          con.close();

but i found following exception

java.sql.SQLException: Column not found



so plz help. what to do?