Facing a very strange problem plz help

hello experts
before sometimes code that is given below was working very well
i doesn,t make any change in this code but after sometime when i run this code thn rs.getstring(1) was not able to acess the data while rs.next(); methode is working properly
is something wrong here or i am missing some very important in this i am very puzzled please help me
<%@ page language="java" import="java.sql.*" %>
<html>
<head>
<title>Process the authentication</title>
</head>
<body background="images/modbkgnd.jpg" bgproperties="fixed">
<%
 String tablename="",query1;
 tablename = request.getParameter("thread");
 String subject = request.getParameter("Subject");
 Connection conn=null;
 out.print(tablename);
 ResultSet rs;
 Statement st=null;
 query1="select * from "+tablename;
try
 Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
 conn=DriverManager.getConnection("jdbc:odbc:lingua");
 st=conn.createStatement();
 rs=st.executeQuery(query1);
 while(rs.next())
%>
 
 <%= subject %>
 <%= rs.getString(2) %>
 <%=rs.getString(3) %>
 
 <a target="_blank" style="text-decoration: none" href="replyforum.jsp?tableid=<%=tablename%>"> Reply>>
 </a>
 
 <table width=60% style="border-collapse: collapse" cellpadding="0" cellspacing="0" border="0" >
 <tr align=left>
 <td width=60%><%= rs.getString(1) %>
 </td>
 </tr>
 </table>
<% }
 }catch(SQLException ex)
 out.print("Please try after some time");
 finally
 conn.close();
 st.close();
%>
</body>
</html>

hello guys for your valuable support but i have tried that thing you are saying above
when i write rs.getString(1) before other it still give unable to access database
think something else i am very confused
[i have told u that code initially was working but now i don,t know why ......................................

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