Error. Required Attribute Missing

Question

Hi,
I had the following code:
<?xml version="1.0"?>
<!DOCTYPE wml PUBLIC "-//WAPFORUM//DTD WML 1.2//EN" "http://www.wapforum.org/DTD/wml12.dtd">
<%@ page session="true" %>
<%@ page import="java.io.*"%>
<%@ page import="java.sql.*"%>
<%@ page import="java.util.*"%>
<%@ page import="javax.servlet.*"%>
<%@ page import="javax.servlet.http.*"%>
<%
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
String url = "jdbc:odbc:DataLink";
Connection con = DriverManager.getConnection(url);
%>
<% Statement stmt = con.createStatement(); %>
<%! String admin, module, grade, displaySQL; %>
<%
admin = (String)session.getAttribute("UserAdmin") ;
displaySQL = "select * from Exam_Result where AdminNo = '"+admin+"' ";
java.sql.ResultSet columns = stmt.executeQuery(displaySQL);
response.setContentType("text/vnd.wap.wml");
%>
<wml>
<card id="Result" title="Exam Result">
<do type="accept" label="Main menu">
<go href="MainMenu.jsp"/></do>
<p align="center">
<table border=1 align="center">
<tr>
<td>Module Code</td>
<td>Grade</td>
</tr>
<% while(columns.next()) {
module = columns.getString("Module_code");
grade = columns.getString("Grade");
%>
<tr>
<td> <%= module %> </td>
<td> <%= grade %> </td>
</tr>
<% } %>
</table>
</p>
</card>
</wml>
<%
columns.close();
stmt.close();
con.close();
%>
When i run using nokia simulator, it display required attribute missing.
Can anyone help me to solve the error?
Thanx in advance....

Answer 1

May be the wap phone has some differences with explorer that IE. For it connect to gateway first,then
the gate connect to you web server. Perhaps the
session (you are using) cannot be kept with wap phone.
You can using url parameters to keep special customer's
info,and create a timer in your web server to trace special customer's id or name. In this way,you can avoid using session instance. --try it and good luck