resultset nao funciona na segunda vez

  consultaSQL = "sql aki'";
            stm=null;
            stm = bd.conectar().createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY);
            rs = stm.executeQuery(consultaSQL);
            rs.beforeFirst();
            rs.next();
            int valor = rs.getInt("coluna");