Hi,
Your servlet is in servlets package, and ValidateBean is in Bean
package.Import the Bean package in Servlet code, and create an object of
the bean adn further invoke the relevant methods.At exaclty which lline you
are getting the null pointer exception.Is it the second line after class
declaration of servlet.
Hope this helps.
Vasudha
----- Original Message -----
From: Garry Fisher <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, June 30, 2000 9:15 AM
Subject: JSP -- Bean -- Servlet
> Can anybody help me with the following problem?
>
> I have a JSP, which is the first page to be displayed; the JSP should
create
> a ValidateBean Object.
>
> When the submit button is pressed the servlet FormValidate is called to do
> some validation processing. This mechanism all works ok but when I try to
> access the ValidateVBean object in the servlet I get a NULL POINTER
> EXCEPTION error because it cannot see the bean created in the JSP. I have
> checked that the JSP and server are accessing the same session and they
are.
>
>
>
> JSP (Simplified).
>
> <html>
> <head>
>
> <%@page language="java" import="bean.ValidateBean" %>
> <jsp:useBean id="validate" class="bean.ValidateBean" scope="session"/>
>
> <FORM name="PersonalDetails" action=/servlet/FormValidate method=post>
>
> <% session.putValue("validate", validate); %>
>
> <table width="600" border="1" cellspacing="0" cellpadding="0"
> bgcolor="#FF9933" bordercolor="#333399" align="center">
> <tr>
> <td height="20" align="left" valign="middle" colspan="6"
> class="form"><font face="Arial," size="1" class="form">First
> Name </font></td>
> <td height="20" align="left" valign="top" colspan="9"
> class="form"><font face="Arial," size="1">
> <input type="text" name="firstname" size="30">
> </font></td>
> <td height="20" align="left" valign="left" colspan="6"
> class="form"><font face="Arial," size="1" class="form">
> <% if (validate.isFirstNameValid() == true) { %>
> First Name Must Be Entered
> <% } %>
>
> <tr>
> <td height="34" colspan="18" class="form">
> <div align="center"> <font size="1">
> <input type="submit" name="Submit" value="Submit">
> </font></div>
> </td>
> </tr>
> </table>
> </FORM>
> </HEAD>
> </HTML>
>
>
> Java Bean Class.
>
> package bean;
>
> public class ValidateBean {
>
> private boolean firstNameValid = true;
>
> public boolean isFirstNameValid() {
> return firstNameValid;
>
> }
>
> public boolean validateFirstName(String inpFirstName) {
> if (inpFirstName == " ") {
> firstNameValid = false;
> return false;
> }
> else {
> firstNameValid = true;
> return true;
> }
> }
> }
>
> Processing Servlet.
>
>
> package servlets;
>
> import java.io.*;
>
> import javax.servlet.*;
> import javax.servlet.http.*;
>
>
> public class FormValidate extends HttpServlet {
>
> bean.ValidateBean validateBean;
>
> public void doGet (HttpServletRequest req, HttpServletResponse
res)
> throws ServletException, IOException
> {
> doPost(req, res);
> }
> public void doPost(HttpServletRequest req, HttpServletResponse res) throws
> ServletException, IOException {
>
> //
>
> try {
> HttpSession sess = req.getSession();
> System.out.println(sess.getId());
> validateBean = (bean.ValidateBean)sess.getValue("validate");
> if
(validateBean.validateFirstName(req.getParameter("firstname")))
> valid = true;
> else
> valid = false;
>
> --- Other Stuff --
>
>
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> Some relevant FAQs on JSP/Servlets can be found at:
>
> http://java.sun.com/products/jsp/faq.html
> http://www.esperanto.org.nz/jsp/jspfaq.html
> http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
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===========================================================================
To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST".
Some relevant FAQs on JSP/Servlets can be found at:
http://java.sun.com/products/jsp/faq.html
http://www.esperanto.org.nz/jsp/jspfaq.html
http://www.jguru.com/jguru/faq/faqpage.jsp?name=JSP
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