Okay I am new to web-programming in general and am confused about how sessions work-:
1) Are sessions stored only on the client computer ? If so then if cookies are disabled then if browsers only store the session how are they able to remember the exact JSESSIONID ? Also how does the server (like Tomcat) remember which JSESSIONID belongs to which user ? Where does it store that information ?
2) If the server also stores the session information then how fast does it become out of date ?
3) If a client has cookies disabled does the server maintain a key-value pair of the IP and the session-id, so that if the same client logs in then the same session-id will be appended ?
4) When does the web-container make the decision of using cookies or the encodeURL() method to embed the session info ?
Generally sessions in web applications expire after a stipulated max inactive interval. To my knowledge primarily the reason is if the session objects are not invalidated they keep exhausting the memory. So my question is
A. Is there any other reason other why web applications timeout the user session after an inactive interval?
B. Social sites never timeout the user session even if you just leave them for the entire day. How do they manage sessions? Don't the active sessions exhaust memory on their servers or JVM to be specific?
Suppose we have two servlets runing inside same war on same server. When user access servlet A and create a session, he then open another tab or browser to access servlet B (session created by servlet A still exist). Inside servlet B, does
I'm deployed application A and application B in TOMCAT server applications, the U1 user enters into the application A, he authenticates and generates a call to a page of the app B. As I was able to access the session of user U1 en A from B, it could have a single session.
Why I can't get an external style sheet work work when using JSP files? Putting a link in the doc head like I would for an HTML or PHP file does not work. The style sheet is in the exact same directory as the JSP files and I cannot get it to work. I think I have tried about everything that has been suggested on the web with no luck.
If I create an HTML doc in the same directory as the JSP files, and add the below line in the document head, it works fine. Doing the same thing with a JSP file does nothing.
After confirmation to the login details I added new cookie having logging information and then dispatched this request to controller servlet where this cookie is checked if it is present then user is forwarded to a particular page. Otherwise is redirected to the sign in page. Now the problem is when we add cookies then it is added into "response" object and when we get cookies we get them from "request" object. So for the first time redirection to controller servlet "response" object would not have this cookie as it is not available in "request" object. But will be available for later requests.
My question is what is the way to get this cookie in the first request. Or is there any way to send refresh like response to the browser so that this cookie is added??
I am using servlet 2.4 I used the ff. code below to set httponly in my application's cookies but it did not work. When I do a javascrip alert (document. cooke) in my page, the session id still shows up.
suppose a user logged in... after some time he want to get back to homepage...okk but suppose i want to get back to previous page by clicking back button on browser...but i dont want to go to login page until and unless i invalidate session...so wat settings i have to do on browser...so that i dont redirect to login page directly...
how this is done using session.setMaxInactiveInterval(); at first, i did not set anything but it expires anyway.so i'm trying not to let the session expire.session.setMaxInactiveInterval(0) does not work.
The problem is as follows: I've been running java script using git bash and at one point it tells me that I need to increase heap size because apparently it takes more than 1gb to run. However although I manually increase it via control panel>programs>java nothing changes. I've been told that I need to ' figure out how to use 64bit java (and a VM that supports 64bit) in order to increase the maximum memory allocation (heap size) to something north of 2g.'
My laptop has 8GB worth of RAM (Windows 7)so it shouldn't technically have problems running anything above 1G. But there is apparently a 1GB wall But increasing the heap size to above 2G results in an error stating that VM doesn't initialize within git bash, I thought that my java is 32 bit so I downloaded a 64 bit java. Now how and if it is even possible to allocate a program to run under 64 bit java and if I should delete the other java version.
1) Instead of showing 0K 5K 10K, I would like to show the country names (A - D), with no number or tick. I figured out this one by just commenting out all the codes relating to ticks.
2) Place the country names in the center of the arch. I don't know how to do this one.
I've got a panel which an arbitrary number of text fields may be added to at run time. I've got it set up so that the window's height, and the height of the panel in which the fields appear will never exceed the height of the screen.What I don't have is a way to make the panel scroll to access the fields that are being visually truncated. I'm setting the autoscrolls on the panel to true, but when I run the program, the fields are simply truncated.
So I'm working on a project and noticed that my toString() method won't work. This is just an example of the type of code that I have in my real project. THIS IS MY MAIN CLASS
XML Code:
package trialanderror; import java.util.Scanner; public class TrialAndError { public static void main(String[] args) { Scanner keys = new Scanner(System.in); String name; String phonenumber;
I want to create a dropdown menu with contents from a database. You can see my Code in the attachment. It does not work, but why? I have a dropdown-symbol, but no contents.
I use Chrome rather than IE. Recently I got an error message when I tried to deposit a check online.
It said that I needed up get a newer version of Java than 6.10, so I downloaded 7u51.
When I tried to deposit the check again, Chrome asked if I wanted to run the app, and I said yes, but that took me back to the download link again.
I spent almost an hour with my bank experts, but they were unable to solve the problem.
When we tried it on Internet Explorer, it worked fine.
Later, I discovered that on the Java Control Panel under the Default Browser for Java, it has only IE and Mozilla, with the IE being checked and greyed out.
I'm assuming that's why the problems on Chrome, even though up until a few days ago, I was able to deposit checks using Chrome-Java.
All I am trying to do is to make a section of code execute if two strings are equal. The two strings are userId and "A001062". When I use the debugger in Eclipse, I can see the value of userId as "A001062" but whatever string comparison I try never evaluates to true. I have tried
userId=="A001602" userId.equals("A001602") "A001602.equals(userId) Assigning A001062 to a string called AAA and comparing userId to AAA
My code is as follows. I have also attached a screen shot from the Eclipse Debugger which makes me think the string comparison should succeed. I never see the debugger execute the print line nor do I see the print line on the JBOSS console.
String userId = StringUtils.trim(nextLine[HR_USER_ID]); String AAA="A001062"; if (userId.intern().equals(AAA.intern())) {System.out.print("MKP1: " + userId+"-"+managerId);} if (userId.compareTo("DTS0428")==0) {System.out.print("MKP2: " + userId+"-"+managerId);}
I am trying to get the gridBagLayout function to sort my code to look like the attached image. I am having trouble figuring out how to do it or even where to start. My code can be seen below and this was as far as I could get on my own.
I have being trying to figure out why my string doesn't work as a passcode and I can't seem to figure out why.
import java.util.*; public class Login { public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("Hello there, please state your name"); String userName = in.nextLine();
I have a code issue and I have a below question for the same.Assuming data[] is of type byte[], is the below statement in java -
while((data[p++] & 0x80) == 0x80);
same as -
while ( (data[p] & 0x80) == 0x80 ) { p++; }
I tried with do { p++; } while ( (data[p] & 0x80) == 0x80 ); That also doesn't seem to be the same thing. I am not putting code around this but essentially if I make this change for not using data[p++] code stops working!
I have a simple applet that doesn't stray outside the sandbox. It used to work fine before Java 7 but now it craps out with security warnings. It does nothing but play a game, it doesn't even save the state of the game. This is the applet, it's a very simple chess program.
The warnings and popups I'm getting are: activate javaTM platform SE 7U?allow now?activation blocked by security settings - I never changed any security settings and as I said, this applet stays firmly in the sandbox so I can't see what the issue is.Viewing the java error window I see
Java Plug-in 10.51.2.13 Using JRE version 1.7.0_51-b13 Java HotSpot(TM) Client VM User home directory = C:UsersMike ---------------------------------------------------- c: clear console window f: finalize objects on finalization queue g: garbage collect h: display this help message l: dump classloader list m: print memory usage o: trigger logging
[code]....
why it shows the C:UsersMike directory in the above listing, there is no access to files etc.The applet plays fine if I run it in appletviewer.What do I need to do to make this simply work in anyone's browser? I have a similar problem with a (rather funky) Connect 4 program I wrote. It worked fine for years and then just stopped with the Java 7.
I can't get Relative paths to work. I have created the class.dat file and I can't get java to recognize it. I am using Eclipse as an IDE. Was wondering if I could get Eclipse to recognize it. I tried with a .txt file as well and couldn't get that to work.
import java.io.*; public class ReadBytes { public static void main(String[] args) { try { FileInputStream file = new FileInputStream("class.dat");
