How to display the values stored in the database in the combobox on load?

I am develping one application where in
I wanted to display the values in the combobox which I am taking from the database and in the same form passing that value in same form after selecting it,My program is running fine for the first time but next time it is giving me NullPointerException.
So can anyone tell me please how I should develop the this application to avoid this exception?
Thank You
Praddy

Thanx a lot for showing interest in answering my query.I am pasting my code for ur reference.Please try to reply ASAP.
Thank You,
Praddy.
CODE:
======
<html>
<head>
     <script language="javascript">
          function submitthisform(thisForm)
               thisForm.submit();
     </script>
</head>
<body>
<form method=post name=samepgm>
Select City:     <select name=city onChange='submitthisform(samepgm)'><br><br><br>
<option value=''></option>
<option value='All'>All</option>
<%@ page language="java" import="java.sql.*" %>
<%
          String scity = request.getParameter("city");
          System.out.println(scity);
          Connection con = null;
          Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          con = DriverManager.getConnection("jdbc:odbc:property","","");
          Statement st = con.createStatement();
          ResultSet rs1 = st.executeQuery("select distinct hcity from housefinance");
          while(rs1.next())
               //String ohname = rs1.getString("hname");
               String     ocity = rs1.getString("hcity");
               //out.println(ohname +"<br>");
               out.println(ocity +"<br>");
%>
<br><br><br><option value='<%=ocity%>'><%=ocity%></option><br>
<%               }
               rs1.close();
          if(scity.equals("All"))
          ResultSet rs2 = st.executeQuery("select * from housefinance");
          while(rs2.next())
               String     ohname = rs2.getString("hname");
               String     ohadd1 = rs2.getString("hadd1");
               //String ohadd2 = rs2.getString("hadd2");
               String     ohcity = rs2.getString("hcity");
               String     ohpcode = rs2.getString("hpcode");
               String     ohtelno = rs2.getString("htelno");
               String     ohfaxno = rs2.getString("hfaxno");
               String     ohemail = rs2.getString("hemail");
               String     ohmobile = rs2.getString("hmobile");
%>
<pre>
<tr>
<td><p>Company          :     <%=ohname%> </p></td>
<td><p>Address          :     <%=ohadd1%></p></td>
<td><p>City          :     <%=ohcity%> </p></td>
<td><p>Pin          :     <%=ohpcode%></p></td>
<td><p>Telphone          :     <%=ohtelno%></p></td>
<td><p>Fax No:          :     <%=ohfaxno%></p></td>
<td><p>Email          :     <%=ohemail%></p></td>
<td><p>Mobile No.     :     <%=ohmobile%></p></td>
</tr>
</pre>
<%
          else
ResultSet rs = st.executeQuery("select * from housefinance where hcity like '%"+scity+"%'");
          while(rs.next())
               String     ohname = rs.getString("hname");
               String     ohadd1 = rs.getString("hadd1");
               //String ohadd2 = rs.getString("hadd2");
               String     ohcity = rs.getString("hcity");
               String     ohpcode = rs.getString("hpcode");
               String     ohtelno = rs.getString("htelno");
               String     ohfaxno = rs.getString("hfaxno");
               String     ohemail = rs.getString("hemail");
               String     ohmobile = rs.getString("hmobile");
%>
<tr>
<td><p>Company          :     <%=ohname%> </p></td>
<td><p>Address          :     <%=ohadd1%></p></td>
<td><p>City          :     <%=ohcity%> </p></td>
<td><p>Pin          :     <%=ohpcode%></p></td>
<td><p>Telphone          :     <%=ohtelno%></p></td>
<td><p>Fax No:          :     <%=ohfaxno%></p></td>
<td><p>Email          :     <%=ohemail%></p></td>
<td><p>Mobile No.     :     <%=ohmobile%></p></td>
</tr>
<hr>
<%               }
%>
</select>
</form>
</body>
</html>

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