Servlets :: When HTTP Session Object Created In Web Application

Jul 17, 2014

When does HTTP Session object is created in web application. Suppose I have a website. Home page of website is HTTP page which contains details of company and link to Login page.

Consider below mentioned user journey as scenario:

a. user arrives at home page of website
b. user click on Login page
c. user fill in login details on login page and click on Submit
d. user is successfully authenticated and authorized from back end
e. User specific page is shown
f. user click on logout link
g. user is successfully logged out from website
h. user is redirected to home page
i. user closes browser

In the above mentioned user journey,

a. at which step does HTTP session starts (means at which steps does HTTP Session object is created ? )
b. at which step does HTTP session ends ?

In case required, assume tech stack to be Java 7, Servlet 2.5, JSP, Tomcat 7, Apache web server (for static web contents).....

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Servlets :: Can Access Session Object Even Session Is Time Out

Jun 4, 2014

Can I access the session object even session has been expired? I need to check whether session is expired or not for each request.The session invalidation is set null the session object. What I concluded, session time out I can access session object but session invalidation I can not access session object. How can I find the session time out by using session object?

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JSP :: Page Directive Attribute Session False - Yet Session Created

Feb 26, 2014

May be I did not understand the meaning and usage of attribute "session" in page directive. My understanding is if session=false, in page directive, then the JSP page will not participate in the session. However, I have my welcomepage as below:

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1" session="true"%>
<%@ taglib uri="http://java.sun.com/jsp/jstl/core" prefix="c" %>
........
.......
<%= session %>
<c:out value="${pageContext.request.session}"/>

if I choose session=true, then both ways of accessing session works , which means the JSP page participated in the session.

But if I change the session=false, then <%= session %> fails, but <c:out value="${pageContext.request.session}"/> does not fail.

how can c:out still show the session, when session = false

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Servlets :: Two Application Servers - Session Replication

Jun 20, 2014

My application has two Application servers, App1 and App2..

We are using weblogic 8.1 Application server

There is session replication done in weblogic.xml file .

<session-descriptor>
<session-param>
<param-name>InvalidationIntervalSecs</param-name>
<param-value>1</param-value>

[Code] ....

The application works fine but currently there is data getting replicated among different users. Is it the problem of session data getting merged with other session data or is it server cache not getting cleared or is there any setting to be changed in weblogic application server??

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Servlets :: HTTP Status 405 - HTTP Method POST Is Not Supported By This URL

May 5, 2014

The JSP page is opening but the problem is if l click on the ADD or EDIT button l receive the 405 error Iam using MySQL and glassfish server

web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">

[Code].....

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JSP :: How Session Created When There Are Two Requests Coming Simultaneously

May 3, 2014

How does jsp create session when there're two requests coming simultaneously from the same client browser(maybe one tab maybe two tabs)?

I ask this question because it is said jsp could solve DuplicateSessionException in flex.

[URL] ....

if so, jsp would create same session(with same session id) for the two requests coming simultaneously?

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Servlets :: Updating Session Value But Same Session In JSP Page Not Updated

Jul 8, 2014

I am developing a e-commerce college project, here i add the items in the cart(a div tag in the jsp page) via servlet by creating sessions,

flow control: shopping jsp (when user wants to add an item in the cart) --> item servlet (which is used to create session and synchronized it) --> cart servlet(which is used to add items in the arraylist and show them in the shopping.jsp's div tag + it also sets the total purchase amount in the session variable "totalpurchase")

now after that user wants to proceed to checkout, here i use the onclick event to check the minimumshopping amount must be less than the totalpurchase (totalpurchase which i had setted in the session),but my jsp page is unable to rechognise the updated value of the totalpurchase, yes, if i reload the page, it rechognises the new updated value of the totalpurchase? but i want it to rechognise the updated total purchase value, without reloading he jsp page..

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JSF :: Count Number Of Views Created In A Session While Using Managed Bean With View Scope

Jan 30, 2014

I am trying to restrict the number of views in JSF 2.0.2 using

<context-param>
<param-name>org.apache.myfaces.NUMBER_OF_VIEWS_IN_SESSION</param-name>
<param-value>5</param-value>
</context-param>

In my case my managed bean is View Scoped and it supports a UI page which has multiple forms and each form is submitted as AJAX POST request.

As per the statndard, setting restriction to 5 should create 5 views and after that based on LRU algorithm the oldest views should get deleted if 6th views is created.

Therefore any action on the oldest view will throw the ViewExpiredException and i simply redirect the user to view expired page.

1) When i set the restriction to 5 views, i open 4 tabs with 3 forms each.
2) I submit the 3 forms on first tab everything works fine.
3) As soon as I go to 2nd tab and submit the first form thr, i get view expired exception
4) It seems I am exceeding the number of views I mentioned in web.xml

I want to know :

1) Does every AJAX POST submit itself creates a view ?
2) How I can count the number of views created in a session ?
3)Can i force expiry of a view in JSF 2.0.2 while the session is still alive ?
4) Normally JSF 2.0.2 session cachces the views. Lets assume session is alive the entire day but a view was created in morning at 9:00 AM and is not used again the entire day. Assuming that session doesn't reaches the max number of views it can save in entire day, will the view created in morning expire on its own after certain interval of time ? If not , can we still force its expiry while keeping the session alive ?

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JSP :: Can Use Object Which Is Created In Servlet?

Dec 7, 2005

How should I access object, which I have created in servlet? Servlet handles the requests(controller) and forwards to requested jsp page.Some of the jsp pages need EJB objects. When i create an ejb object in servlet and then forward the request to jsp, how can i access the object in jsp ? This should be MVC - based application, like JSP-Servlet-EJB.

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Servlets :: Error / Http Status 500

Mar 9, 2014

i am using netbeans6.7.1 version i implemented one program i.e web application ..when am excuting this one i got one error http status 500...

this is the code:

SumServlet.java
package com.sum;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletConfig;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;

[code]....

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Servlets :: HTTP 404 / The Requested Resource Is Not Available

May 10, 2014

i have one html page through which i want to go to servlet page but after submit it give the http 404 error.

i am using tomcat apache server.

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Servlets :: Error / HTTP Status 400

Mar 9, 2014

correct this error

WishSrv.java

package com.wish;
import java.io.IOException;
import java.io.PrintWriter;
import java.util.Calendar;
import javax.servlet.ServletException;

[code]...

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Servlets :: Return To HTTP From HTTPS

Oct 27, 2011

in my web.xml I declared a resource under the block

<user-data-constraint>
<transport-guarantee>CONFIDENTIAL</transport-guarantee>
</user-data-constraint>

This resource is about a login page.But when I logout or when I visit some pages like Contacts or Home Page, I wouldn't use HTTPS protocol.At the moment, HTTPS remain in the url even if I declared this protocol only for that resource..This is my (little) web.xml

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee

[code]....

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How To Reference Object Created In One Class From Another

Oct 30, 2014

I have started working on a little project in my free time. It is just a simple text rpg that runs in a counsel window. I have 5 files each file contains 1 class.

public class SomnusCharacter {
private String gender = "";
private int age = 0;
private String race = "";
private int level = 0;
private int xp = 0;

[Code] ....

The chain of events right now is:

1. MainMenu is run
2. If user inputs n CreateCharactor is run
3. User inputs name, age, ect in SomnusCharacter object made in CreateCharacter
4. Intro (just rough demo for testing purposes) is run
5. If user inputs m Menu is run
6. Menu calls and prints out all the information from the object made in CreateCharacter

Step 6 is where I am having my problems. How can I reference (lets say the SomnusCharacter object made is called player) player from my Menu class? I know that if I made a new character that it would just create another SomunsCharacter object with the default values again.

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Object Created Inside Switch

Mar 2, 2014

I have create as short example which contains two classes Cat and Dog followed by a switch statement in the main method.

Class Cat

public class Cat {
private String name;
//Setter
public void setName(String pName)
{name = pName;}
//Getter
public String getName()
{return name;}
// Constructor
public Cat(String catName)
{name = catName;}

[code]....

My Issue is that after creating the objects within the switch statement, is there a way to return the objects back to the main method once created within the switch ?

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Accessing Object Created In Another Class

Mar 10, 2014

I have a situation where I have 2 classes and an array of objects which are causing me trouble.

The object type is one I have created - it is made from a class which is neither of the 2 classes I previously mentioned.

The array is created and occupied in Class1 and the problem arises when I try to reference one of the element from Class2.

At first I forgot the the array would be local to Class1.main so I made the array a global variable using:

Java Code: public MyObjectType[] myArray; mh_sh_highlight_all('java');
Then I tried accessing an element (2) from Class2 using:

Java Code: Class1.myArray[2] mh_sh_highlight_all('java');
However I get errors saying that I can't access the static variable from a non-static context.

I understand a little bit about static and non-static objects/methods but don't know how to fix this. Do I need to include "static" in the array declaration?

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Oct 29, 2014

I am working on an independent project it is a simple little text based rpg that will run in a counsel window. I have an object for Character that is creating during a CreateCharacter method. I want the play to be able to enter a character that will open up a menu that displays things like the name and health and stuff of the character from the object created in CreateCharacter, but because I have it in a different class I don't know how to reference the object made in CreateCharacter.

I have it in 6 files

Character --- Object with getters/setters for things like name, age, race, class, ect
MainMenu --- Displays title and promts for new game and quit
CreateCharacter --- Walks through and sets all values in Character
Stats --- Keeps the players stats (health, attack, ect) in an array
Intro --- Beginning demo thing (not really important for this question)
Menu --- Displays all current user stats (Having issues with this one)

Example I have this in Menu

System.out.println("Name: " + ????.getName());

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Servlets :: HTTP Error 404 Resource Not Found

Feb 20, 2014

I am trying to use hidden variable in project.When I launch my project i am able to get the welcome page.But when submit login values i am getting HTTP 404 error- Resource not found error.

`My home Page/Login Page

<body>
<form action="<%=request.getContextPath() %>/LoginServlet" method="get">
USERNAME<input type="text" name="uname"><br>
PASSWORD<input type="password" name="pass"><br>
<input type="submit" name="submit" value="submit">

My LoginServlet

protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
System.out.println("sandeep");
PrintWriter out=response.getWriter();
String userName=request.getParameter("uname");

[code].....

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Servlets :: HTTP 404 Requested Resource Is Unavailable

Aug 28, 2014

So I have a screen I click on. The "webPage" comes back as the requested resource unavailable.

What I don't get is that when I run the server locally on my machine it works just fine. But when this is deployed out to server I get the error. The screen comes up but the data doesn't show up. Where should I look to troubleshoot this?

@RequestMapping(value = "/webPage_data", method = RequestMethod.GET)
public @ResponseBody
DataTableDto pastControllerDataFeed(Model model) {

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Feb 26, 2014

Below is my Servletclass code

import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class MyFirstServlet extends HttpServlet {

[Code] .....

I have configured tomcat7 in my ecclipse ide...

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How To Use Session Handler Created In One Class In Another Class

Apr 9, 2014

I have created a session handler in one class as below:

Session session = null;

Now, I want to use the same session handler in different class for creating channels. I don't want to create new session handler. How to do that?

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Apr 7, 2015

I need to built a file upload service which should be memory effective. I should avoid loading the entire file into memory,Since I may have multiple http request which will pile up the Heap memory. Any effective way to upload a large file(For ex:1GB file) using http Streaming. I need to do the file upload on a single http call. Let's consider a scenario where 1 GB file to be uploaded using 512MB Heap memory. Not Sure If practically I can achieve this or not.

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Dec 9, 2014

Why query string is not getting created in doPost method of HttpServlet?Is this reason is enough - it is supplying data in html body.

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Sep 9, 2014

I would like to know the details about how a server handles a multipart request. I know that a webserver comprises of a HTTP adapter(which is responsible for receiving http requests and sending http responses) and a container(which is responsible for handling dynamic requests).

So, when a client sends a request, the HTTP adapter receives it. Then transfers the request to the container if the http adapter cannot handle it(jsps, servlets for example).

Suppose, a client sends a multipart request which has an avi file of size upto 100mb. For example, lets assume that the client takes 5 minutes to upload the file.

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If its right then there is no easy way to terminate the multipart request unless the entire file is transferred to the server. Is this right?

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Servlets :: HTTP Status 404 Error In Basic Login Form

May 22, 2014

I'm trying to learn java by making a login page using java, servlet, javascript, html and mysql. I can login with username and password, I can get all the information from database in the edit page. However, when I edit and click on "Submit" in EditPage.jsp, it gives HTTP Status 404. Same screen appears when I click on "Sign Up" from first page (NewFile.jsp) and click on "Submit" button after filling up user information.

I am posting all my code here but probably important ones are:

EditPage.jsp, Edit.java, EditDetails.java, UpdateUser.java and for Sign Up SignUpPage.jsp and Registration.java.

Firstly here are my error message and ss from my project explorer:

Here is my code:

LoginServlet.java
package com.amzi.servlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;

[Code] ....

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Sep 5, 2014

I am running a test servlet on Tomcat and have implemented different behaviours for the doPost and doGet methods. When I access from the browser, only the doGet method gets called ultimately.

The Firefox developer tools show me a GET request from the browser to my Tomcat instance. Do browsers ever call the POST http method? How could I make this happen?

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