Java Servlet :: Session Information Is Getting Overwritten Once Multiple User Logged In
Aug 18, 2012
I am using following servlet code to store the logged in user information in the session.
session = request.getSession();
session.setAttribute("userName", userName );
session.setAttribute( "LoginId", loginId );
The information is getting stored in the session and i am able to retrieve the same for single user. The trouble starts when 2 user logged in from different browser (for example chrome, IE) from the same machine. The 2nd logged in user, overwrite the session information of first user.
How to prevent this.
My environment: Windows 7 64 bit, IBM websphere server, Oracle 11g, JSP, Sevrlet.
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Dec 8, 2014
I need to write a program that will let a user input name, age, email, and cell phone number, and commit the input to a text file. They need to add multiple entries. I figured out how to create the file and write to it, but when the user enters a second set of information, the first is overwritten. How can I make the file be added to instead of overwritten? The following is my code:
try
{
FileWriter writer = new FileWriter("ContactInformation.txt");
BufferedWriter bw = new BufferedWriter(writer);
nameTextField.write(bw);
bw.newLine();
[Code] ....
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Aug 3, 2012
How we can renew the session Id of the logged in user in order to prevent any session fixation problems. Is there any API in servlets to do it?
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May 3, 2014
I am making my minor project on a money management website. One problem is occurring:
As we are registering via register.jsp page, the form in that jsp page calls the "saveuser" servlet which saves the user data in the database.
But the data is not getting saved. Following is the code of register.jsp page:
<!DOCTYPE HTML>
<html>
<head>
<title>Virtual Wallet</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
[Code] .....
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Jul 17, 2013
So far I only know using
request.getRemoteAddr() get
to get user IP address, is that a way to get Users PC memory?
long maxMemory = runtime.maxMemory();
long allocatedMemory = runtime.totalMemory();
long freeMemory = runtime.freeMemory();
Only get server memory not the client....
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Aug 3, 2012
How is session maintained in the application server, internally what happens when the user has logged in ? We create a session and store the user details which will be stored in the session object in the server with a unique sessionID which will be validated when the same user login the system again? But how exactly the session is maintained in the Server internally?
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Dec 7, 2012
Coding a web application using Java 6. Try to implement the session timeout for users.
In the web.xml, I added:
<session-config>
<session-timeout>480</session-timeout> <!-- jsp will expire in 8 hours -->
</session-config>
Now, during the runtime, if a user does not touch the jsp page for 8 hours (after the user has signed in), the session timeout mechanism will kick in. At that point, the server side will automatically execute:
rd = req.getRequestDispatcher("/signin.jsp");
So that the user will have to re-sign in, before continue the work.
How can I achieve this goal?
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Jan 24, 2014
I am using form based, declarative security approach. And, when some user, on login form enters user credentials (username and password), he is being redirected to certain/secured jsp page.
Part of that page content is:Hello <%=request.getUserPrincipal().getName().toString()%> You are able to view this page because you are authorized user.You can see that this is implemented using JSP scriptlet. And this works. I would like to use JSTL instead of scriptlet.
So, instead of scriptlet, I put this JSTL code: <c:out value="${requestScope.userPrincipal.name}"/>, but not getting user's username with it. Basically, I don't clearly understand where and how are these objects/user credentials being stored with Form based JAAS.
I would like on JSP page to check if some user is already logged in. So, if there is logged user to display user's name (also with JSTL).Something like this:
<c:if test="${not empty sessionScope.userPrincipal}">
User <c:out value="${sessionScope.userPrincipal.name}" />
</c:if>
Here I tried with sessionScope but still not getting anything.
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May 15, 2014
I put link using JQuery on Home Page,
<div class="list_block1" >
script type="text/javascript" src="js/jquery.leanModal.min.js"></script>
<link rel="stylesheet" href="http://netdna.bootstrapcdn.com/font-awesome/4.0.3/css/font-awesome.min.css" />
<link type="text/css" rel="stylesheet" href="css/style.css" />
<link rel="stylesheet" type="text/css" href="css/postoffer.css" media="all"/>
<div class="container">
<a id="modal_trigger" href="#modal" class="btn">Click here to Login or register</a>
<%
[Code] ....
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Jan 10, 2013
I have a button in jsp, when the onclick event is fired, it will send the request to someaction.do to generate a report and display that report in a new window.
After clicking the button to generate the report, in the business class a sql query is getting executed.
If the query result has less data, then I don't have any problem, I could view my report page.
If the query result has more data, then the query takes at least 5-6mins to complete. However, before the query completes its execution, the same request is automatically invoked again. Due to this the report is not getting generated because [...of the multiple requests?], the browser shows an Internet Explorer error and ends up at a blank page.
No exception is thrown and the only place I could find the place of query execution it stops and starts as a new request from web.xml with Servlet Filters, Action.
Note: For a single .do request, the request is getting repeated for 3 times. Overlapping of request also takes place.
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Jun 1, 2014
In stateful session bean client servlet we are explicitly setting shoppingCart to session attribute. I do not remember doing similar step withStatelessSession bean.
request.getSession(true).setAttribute("cart",shoppingCart);
I do have have annotation as well
@EJB
ShoppingCart shoppingCart
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Jan 23, 2013
I am a beginner want to compile servlet with following path
javac -classpath Program FilesApache Software FoundationTomcat 5.5commonlibservlet-api.jar;classes:.-d classes srccomexamplewebBeerSelect.java
Problem arises as follows:
javac: invalid flag: FilesApache
Usage: javac <options> <source files>
use -help for a list of possible options
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May 12, 2014
As I am new in java, JSP and DATABASE...
<form action="Insert_Values_Servlet" method="post">
<label><strong>Title</strong></label>
<input type="text" name="Title" placeholder="max 50 characters"/><br>
<label><strong>Profession</strong></label>
<input type="text" name="Profession" placeholder="Ex.Manager"/> <br>
<input type="checkbox" value="LifeStyle" id="slideOne" name="check" />
<label for="slideOne">LifeStyle</label><br />
[Code]...
This is my insert.jsp page I want to insert multiple values into database Including multiple values of checkbox, other values are getting inserted but only problem at selecting multiple checkbox values in same column and radio button value in same column.
---------------------look for servlet page below----------------
Connection con = null;
ResultSet rs = null;
PreparedStatement pst = null;
int user = 0;
String User_Id1 = null;
String Other_Services = "";
String Title = request.getParameter("Title");
[Code]...
Is there any solution to insert this...By mistake in query I have followed with extra questionmark in following line This is correctline for inserting 5 values in database
String insertinfo = "INSERT into offer_data (Title,Profession, Other_Services ,Area, City) values(?,?,?,?,?)";
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Mar 18, 2014
I have a question about how to check for a session as the user goes through different pages. I am using Java beans and EL to pass data from page to page but I cannot figure out how to check for a session on the pages without the use of a scriptlet with an if else statement in it.
I do not want the user to be able to access any pages unless they are logged in. With a scriptlet, I can create a statement that says if session exists show name else redirect to login page.
From what I have read and what some of the wonderful members here have told me, scriptlets are a big no no these days. So, how do I do these without the use of a scriptlet?
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Mar 6, 2014
I'm using the JOptionPane to display and receive information to/from the user. In addition to this, I am using StringBuilder to receive inputs from the user and then manipulate (append) that input to display the desired output.
//Example
(JOptionPane): "Enter text"
(user input): Java is cool!
(program): *stringBuilder.append(" I love it!")
JOptionPane.showMessageDialog( );
.....
Psuedo-like code. The problem is that showMessageDialog(null, string) and not showMessageDialog(string, string). I want to display the enter text: " Java is cool! I love it! " in the JOptionPane. How do I accomplish this, since showMessageDialog only accepts (null, string).
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Sep 17, 2014
I am new to Java an have to Create a program that keeps track of the following information input by the user: First Name, Last Name, Phone Number, and Age. Now - let's store this in a multidimensional array that will hold 10 of these contacts. So our multidimensional array will need to be 10 rows and 4 columns.You should be able to add and remove contacts in the array.
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Apr 19, 2014
I wanted to write a simple code that receives information from the user (double-digit number and above) and calculates it's numbers.
For instance- The user wrote a number- 234, the software will return the number 9 (2+3+4 = 9).
Tried to use a loop for that, but I got stuck since I didn't know what to write.
This is what I've wrote so far
Java Code:
import java.util.Scanner;
public class Calculate {
public static void main(String[] args) {
System.out.println("Please type a number larger than 9");
Scanner type = new Scanner(System.in);
String number1 = type.nextLine();
for( int i = 0; i < number1.length(); i++ ){
int calculate = number1.charAt(i);
}
}
} mh_sh_highlight_all('java');
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Oct 12, 2014
I am new to using arrays. I need to collect user input for book title, author, and # of pages... store that in an array... and then I'm going to need to be able to sort that array. The dialog boxes come up prompting the user for 5 sets of title, author, and # of pages, but when I try to display that information, it isn't working. I am assuming this means that it's not storing the information correctly... so I want to get this corrected before I even try to sort??
import javax.swing.*;
import java.util.*;
class LibraryBookSort
{
public static void main(String[] args)
{
LibraryBook[] someBooks = new LibraryBook[5];
[Code] ....
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Mar 18, 2014
I have to use the company's login resource, which returns a login page for authentication after a browser/user page request; after successfully authenticated, the session attributes are set in a (remote) valued object (VO) invoked via servlet; then, such values are set in my (local) POJO.
I want to display the current user session attribute (see xChave below) and save it in database. How can I persist http User session attributes through the structure below?
Abstract Controller (just the main code):
public abstract class AbstractController<T> {
@Inject
private AbstractFacade<T> ejbFacade;
private Class<T> itemClass;
private T selected;
private Collection<T> items;
//GETTERS AND SETTERS OMMITED
public AbstractController(Class<T> itemClass) {
this.itemClass = itemClass;
}
[code]...
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Jul 11, 2014
I can insert data in database, delete aslo using JSP. But facing problem while updating the information saved in database as m using MySQL 2008. I want to see the bring saved in database with particular username into the updateinfo.jsp form.
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Oct 19, 2014
Variable Fields are not holding information through constructor from user input so here's what I did instead.
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Feb 1, 2013
Previous page can be seen even after user logs out from the JSP page.
My code is:
Logout.jsp:
<%@page contentType="text/html" pageEncoding="UTF-8"%>
<html>
<head>
<title>JSP Page</title>
[Code] ....
how to resolve this?
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Nov 23, 2014
I had to make a program that allowed the user to enter the number of students and the students names and grades and then print out the name with the grade in descending order. right now I only have it where it prints the names out in descending order. how do I get it the print out with the grade?
Here is my code
import java.util.*;
public class Grades {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.print("Enter the number of students: ");
int numofstudents = input.nextInt();
[Code] .....
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Jan 26, 2014
I am attempting to make a heart rate calculator program. Here is a little overview of what I am trying to do. It must use a constructor and get and set methods. It must print heart rate ranges and the user's information(age).
// Use scanner to get inputs
import java.util.Scanner;
// Declare class
public class HeartRates {
private int Age;
private int DayOfBirth;
private int MonthOfBirth;
private int YearOfBirth;
private double MaxHeartRate;
private double MinTargetHeartRate;
[Code] ....
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Apr 3, 2014
I'm making a program for school that reads a text file with answers to a personality test and prints the temperament to an output file. Problem is, it sets the temperament for the first person to INFJ and then prints INFJ for the rest of the people too. My code is below, and the input file 'personality.txt' goes like this:
Betty Boop
BABAAAABAAAAAAABAAAABBAAAAAABAAAABABAABAAABABABAABAAAAAABAAAAAABAAAAAA
Snoopy
AABBAABBBBBABABAAAAABABBAABBAAAABBBAAABAABAABABAAAABAABBBBAAABBAABABBB
Bugs Bunny
aabaabbabbbaaaabaaaabaaaaababbbaabaaaabaabbbbabaaaabaabaaaaaabbaaaaabb
Daffy Duck
BAAAAA-BAAAABABAAAAAABA-AAAABABAAAABAABAA-BAAABAABAAAAAABA-BAAABA-BAAA
The frumious bandersnatch
[code]....
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May 5, 2014
This program contains a superclass and a subclass that will gather the following information from the user:
name, address, phone number, and customer number.
Everything works fine except that I have to create a boolean method in this program that is required to determine based on user input whether they want to be added to a mailing list.
I cannot get this method to work with main, each time it is called it will always return the value but main will constantly read the last statement (else, where it will read "not wanting to be added to the mailing list).
The only way I can get this part of the program to work is by adding an equals method in main that ignores the case, but I am required to write a boolean method so this is not allowed.
Superclass:
public class Person
{
private String name;
private String address;
private String phoneNum;
public Person(String pName, String add, String number)
{
name = pName;
address = add;
[Code] ...
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