Problem when passing string array in sessions showing null value

i am trying to pass a string array but it is showing me the null value
i think the the problem is seem to be in session.settAttribute("subject['"+i+"']",subject) in 2.login_action.jsp
or in String sub1=(String) session.getAttribute("subject[0]"); in 3.user_home.jsp
i have following three pages
1.login.html
2.login_action.jsp
3.user_home.html
1.login.html
<html>
<body>
<form method="post" action="login_action.jsp">
Username<input type="text" name="username"></input>
<br>
Password<input type="password" name="password"></input>
<input type="submit" value="login"></input>
</form>
</body>
</html>
2.login_action.jsp
<%@ page contentType="text/html"%>
<%@ page import="java.sql.*" %>
<%!
String user,pwd;
String subject[]=new String[10];
int i,totalsubject;
%>
<%
try
user=request.getParameter("username");
pwd=request.getParameter("password");
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection con = DriverManager.getConnection("jdbc:odbc:ods","scott","tiger");
PreparedStatement ps = con.prepareStatement("select password from users where username='"+user+"'");
ResultSet rs = ps.executeQuery();
if(rs.next())
if(rs.getString("password").equals(pwd))
session.setAttribute("username",user);
PreparedStatement ps2 = con.prepareStatement("select subject_id from allot_teachers where staff_id='"+user+"'");
                    ResultSet rs2 = ps2.executeQuery();
                         while(rs2.next())
                         i=0;
                         subject[i]=rs2.getString(1);
// if i display here the subjects in out.println(subject[i]) it is working fine
// but in next redirected page it is showing null
                         session.setAttribute("subject['"+i+"']",subject[i]);
                         //out.println(subject[i]);
                         i++;
response.sendRedirect("user_home.jsp");
else
out.println("error invalid username or password");
else
out.println("error invalid username or password");
con.close();
catch(Exception e)
out.println(e);
%>
3. user_home.jsp
<%@ page contentType="text/html"%>
<%@ page import="java.sql.*" %>
<html>
<%
String user,pwd,cat,cat1;
String username=(String) session.getAttribute("username");
if(username==null)
response.sendRedirect("login.html");
//just tried for first two subjects
String sub1=(String) session.getAttribute("subject[0]");
String sub2=(String) session.getAttribute("subject[1]");
//here it is printing null
out.println(sub1);
//here it is printing null
out.println(sub2);
%>
<form method="post" action="logout.jsp">
<input type="submit" value="Logout"></input>
</form>
</html>
Cheers & Regards
sweety

The name in getAttributre doesnt match the name in setAttribute.
Note "subject[0]" is a string containing 10 chars, "subject" is a string containing 7 chars.
Here is your code:
session.setAttribute("subject",subject);
String sub1=(String) session.getAttribute("subject[0]");

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Problem when passing string array in sessions showing null value

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