Hi every body,
iam develpoing a sample application for login form with
validations and persist the data by using googleappengine with java
using eclipse.but iam getting the null pointer exception at the time
of running.plz any one tell me the solution.
my code is
registe.jsp
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="javax.jdo.PersistenceManager" %>
<%@ page import="javax.jdo.Query" %>
<%@ page import="com.google.org.*" %>
<html>
<SCRIPT LANGUAGE="JavaScript">
function button_actions()
{
var flag=0;
var errors="";
if(!document.my_form.first_name.value)
{
alert("you need to supply your first name");
document.my_form.first_name.focus();
return false;
}
if(!document.my_form.last_name.value)
{
alert("you need to supply your last name");
document.my_form.last_name.focus();
return false;
}
var id = document.my_form.email.value;
var re = /^...@.+\..{2,4}$/gi;
if(!id.match(re))
{
flag++;
errors = errors + "E-Mail\n";
}
if(flag > 0)
{
alert("invalid email adress\n"+
errors+"\nPlease re-enter email-id.");
return 0;
}
if(!document.my_form.user_password.value)
{
alert("you need to supply your passsword");
document.my_form.user_password.focus();
return false;
}
}
</SCRIPT>
<body>
<div class="main">
<div class="header">
<h1>
example
</h1>
</div>
<h2>
new entry
</h2>
<div class="ex">
<form name="my_form" action="./register2" method="get">
First Name
<input type="text" name="first_name" size="30"></br>
LastName
<input type="text" name="last_name" size="30"></br>
Email
<input type="text" name="email" size="30"></br>
password
<input type="password" name="user_password" size="30"></br>
confirm password
<input type="password" name="confirm_password" size="30"></br>
<input type="submit" value="submit" onclick="button_actions()"/>
</form>
</div>
<h2>
entries
</h2>
<div class="entryList">
<%
List<entry> entries= new ArrayList();
PersistenceManager pm=PMF.get().getPersistenceManager();
Query query=pm.newQuery("SELECT FROM " +entry.class.getName());
entries=(List<entry>) query.execute();
%>
<%
if(entries.isEmpty()) {
%>
<%
}
else {
%>
<%
for(entry e:entries){
%>
<div> <%=e.getEmail()%></div>
<div class="Quantity"> Quantity is<%=e.getUser_password()%></
div>
<%
}
}
%>
</div>
</body>
</html>
web.xml:
<servlet>
<servlet-name>Shop2</servlet-name>
<servlet-class>com.google.org.Shop2Servlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>Shop2</servlet-name>
<url-pattern>/shop2</url-pattern>
</servlet-mapping>
<welcome-file-list>
<welcome-file>shop2.jsp</welcome-file>
</welcome-file-list>
</web-app>
enty.java
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.IdentityType;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;
@PersistenceCapable(identityType = IdentityType.APPLICATION)
public class entry {
@PrimaryKey
@Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
private Long id;
@Persistent
private String first_name;
@Persistent
private String last_name;
@Persistent
private String email;
@Persistent
private String user_password;
@Persistent
private String confirm_password;
public entry(String email,String user_password)
{
this.email= email;
this.user_password= user_password;
}
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}
/*public String getFirst_name() {
return first_name;
}
public void setFirst_name(String firstName) {
first_name = firstName;
}
public String getLast_name() {
return last_name;
}
public void setLast_name(String lastName) {
last_name = lastName;
}*/
public String getEmail() {
return email;
}
public void setEmail(String email) {
this.email = email;
}
public String getUser_password() {
return user_password;
}
public void setUser_password(String userPassword) {
user_password = userPassword;
}
/*public String getConfirm_password() {
return confirm_password;
}
public void setConfirm_password(String confirmPassword) {
confirm_password = confirmPassword;
}*/
}
pmf.java
package com.google.org;
import javax.jdo.JDOHelper;
import javax.jdo.PersistenceManagerFactory;
public final class PMF {
private static final PersistenceManagerFactory pmfInstance =
JDOHelper.getPersistenceManagerFactory("transactions-
optional");
private PMF() {}
public static PersistenceManagerFactory get() {
return pmfInstance;
}
}
register.java
package com.google.org;
import java.io.IOException;
import javax.servlet.http.*;
import javax.servlet.*;
import java.util.*;
import java.io.*;
import javax.jdo.PersistenceManager;
import javax.jdo.Query;
@SuppressWarnings("serial")
public class Register2Servlet extends HttpServlet {
HttpSession session;
String user_password,email, clickButton;
public void doGet(HttpServletRequest req, HttpServletResponse resp)
throws IOException {
resp.setContentType("text/plain");
PrintWriter pw=resp.getWriter();
session=req.getSession(true);
clickButton=req.getParameter("submit");
email=req.getParameter("email");
user_password=req.getParameter("user_password");
entry ex=new entry(email,user_password );
PersistenceManager pm=PMF.get().getPersistenceManager();
pm.makePersistent(ex);
if(clickButton.equals("submit"))
{
if(!(email.equals("")||user_password.equals("")))
session.setAttribute(email,user_password);
resp.sendRedirect("./register.jsp");
}
pw.close();
pm.close();
}
}
plzzzzzzzzzzzzzz help me.
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