Jsp form + servet =nullpointer

Hi everyone,
I'm trying to make a form using a servlet to insert the data from the jsp form into my database. What im using was from an example i found online.
All i'm trying to do right now is declare a string with the req.getParameter("textdemo"); But everytime i submit my form, i get a null pointer.
here is my java code.
package com.stardeveloper.servlets.db;
import java.sql.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
public class InsertServlet extends HttpServlet {
     public void doGet(HttpServletRequest req, HttpServletResponse res)
          throws ServletException, IOException {
          res.setContentType("text/html");
          PrintWriter out = res.getWriter();
          StringWriter tempEntry = new StringWriter();
          String test = req.getParameter("textdemo");
          out.print("<html><body>");
          out.print("<form action=\"");
          out.print( req.getRequestURI() );
          out.print("\" method=\"post\">");
          out.print("First Name :<br>");
          out.print("<input type=\"text\" name=\"first\"><br>");
          out.print("Last Name :<br>");
          out.print("<input type=\"text\" name=\"last\">");
          out.print("<br><br><input type=\"submit\" value=\" + test + \">");
          out.print("     Insert Record");
          out.print("      <input type=\"submit\" value=\" \">");
          out.print("     Display Records</form>");
          out.print("</body></html>");
          out.close();
     public void doPost(HttpServletRequest req, HttpServletResponse res)
          throws ServletException, IOException {
          res.setContentType("text/html");
          PrintWriter out = res.getWriter();
          out.print("<html><body>");
          out.print("<code><pre>");
          out.println("ID\tFirst Name\tLast Name\n");
          // receiving parameters
          String first = req.getParameter("first").trim();
          String last = req.getParameter("last").trim();
          boolean proceed = false;
          if(first != null && last != null)
               if(first.length() > 0 && last.length() > 0)
                    proceed = true;
          // connecting to database
          Connection con = null;
          Statement stmt = null;
          ResultSet rs = null;
          PreparedStatement ps = null;
          try {
               Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
          con=DriverManager.getConnection("jdbc:odbc:odbc_exmp");
               String sql;
          sql = "INSERT INTO Names(first_name, last_name) VALUES (?,?)";
               ps = con.prepareStatement(sql);
               stmt = con.createStatement();
               // inserting records
               if(proceed) {
                    ps.setString(1, first);
                    ps.setString(2, last);
                    ps.executeUpdate();
               // displaying records
               rs = stmt.executeQuery("SELECT * FROM Names");
               while(rs.next()) {
                    out.print(rs.getObject(1).toString());
                    out.print("\t");
                    out.print(rs.getObject(2).toString());
                    out.print("\t\t");
                    out.print(rs.getObject(3).toString());
                    out.print("\n");
          } catch (SQLException e) {
               throw new ServletException(e);
          } catch (ClassNotFoundException e) {
               throw new ServletException(e);
          } finally {
               try {
                    if(rs != null)
                         rs.close();
                    if(stmt != null)
                         stmt.close();
                    if(ps != null)
                         ps.close();
                    if(con != null)
                         con.close();
               } catch (SQLException e) {}
          out.print("</body></html>");
          out.close();
}and here is the JSP code.
<a href="servlet/InsertServlet">sdfsdf</a>
<form action="servlet/InsertServlet" method="post">
textdemo
<input type="text" name="textdemo" />
submit
<input type="submit" name="Submit" value="Submit" />
</form>Does anyone know why the servlet is throwing an nullpointer?
thanks

now to make the things very clear, try this example
the servlet
* s1.java
* Created on March 28, 2006, 3:41 PM
import java.io.*;
import java.net.*;
import javax.servlet.*;
import javax.servlet.http.*;
* @author AJ Deschanel, [email protected]
public class s1 extends HttpServlet
     public void doGet(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
          res.setContentType("text/html");
          PrintWriter out = res.getWriter();
          StringWriter tempEntry = new StringWriter();
          String test = req.getParameter("getVar");
          out.print("getVar=" + test);
                out.close();
     public void doPost(HttpServletRequest req, HttpServletResponse res) throws ServletException, IOException
          res.setContentType("text/html");
          PrintWriter out = res.getWriter();
          String text = req.getParameter("postVar").trim();
                out.println("postVar = " + text);
          out.close();
}and the jsp page
<a href="/web3/s1?getVar=g10">Servlet</a>
<form action="/web3/s1" method="post">
textdemo
<input type="text" name="postVar" value="p20"/>
<input type="submit" name="Submit" value="Submit" />
</form>try both
1) hit the submit button, (for POST)
2) click the Servlet hyperlink (for GET)
PS
my application has teh name web3, so you change my code accordingly to your settings

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HTTP Status 500 -
type Exception report
message
description The server encountered an internal error () that prevented it from fulfilling this request.
exception
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Including jsp form in multiple jsps

Hi
I have a requirement to include a common jsp form in several other jsps that live in different web applications. For e.g. there is test_form.jsp taht I can access via http://www.test.com/common/test_form.jsp. There are several other jsps /app1/call_test1.jsp , /app2/call_test1.jsp taht need to include the /common/test_form.jsp. These jsps just provide different look with specific images etc.. We also need the pages to be accessed via those specific urls.
The form is showing fine. But when I submit the included form, I am submitting to the wrapper jsp(say /app1/call_test1.jsp which I am passing as aparam to teh include), if any validation errors its supposed to show on /app1/call_test1.jsp. But its not showing them. If I call the include jsp separately in the browser, its working fine. How can I get the form errors dispalyed on the wrppaer.jsp??
Any help is appreciated
Thanks

<select size="8" name="fruit" multiple>
<option value="apple">apple</option>
<option value="orange">orange</option>
<option value="mango">mango</option>
<option value="cherry">cherry</option>
<option value="pineapple">pineapple</option>
<option value="grapes">grapes</option>
</select>
if i select apple, orange,mango and cherry and submit it to the database field 'fruit', only 'apple' gets inserted. none others.
this is the the line where it is processing the value.
String fruit=request.getParameter("fruit");
by the way I have only one database table
I hope this example helps

Jsp form + servet =nullpointer

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