Go4Expert - error :java.lang.NullPointerException in searchuser.jsp page

Hi,
I am creating the updateuser.jsp page. For that I create search.jsp where one can serch users and after submitting this page.it should display the updateuser.jsp page where I can update the details of user. Here is my code of searchuser.jsp:

Code:

<% Connection connection = null;

        Statement st = null;

        ResultSet rs = null;

        Class.forName("com.mysql.jdbc.Driver");

        Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/mynewdatabase","root", "root123");

     ///  st=connection.createStatement();///

           try {

        rs = st.executeQuery("Select * from user order by useid Asc");

                           while (rs.next())

                                 {

                      %>

                                <option value = "<%=rs.getString("userid")%>" >

                                <%=rs.getString("emailid") + " "+rs.getString("groupid")%>

                                        </option>

                      <%

                           }



                       }

                       finally

                       {

                           if (rs != null)

                           {

                               rs.close();

                               rs = null;

                           }

                           if (st != null)

                           {

                               st.close();

                               st = null;

                           }



                       }

                   %>

but shows error at above marked line as:

java.lang.NullPointerException
org.apache.jsp.searchuser_jsp._jspService(searchus er_jsp.java:91)

Well, whether it is right way to retrive data and shows to user?
Any suggestion is highly appreciated.
Thanks and Regards
Haresh