Application Disconnects From Session In Production Server
Jun 20, 2014
I have an application developed in Jsf, hibernate eh-cache. i deployed it on jboss server and users are directly accessing jboss url on port 8080 in internal network. Now problem is, number of users for this application has been increased. This application have one page containing 20 records which gets fetched from cache on jsf page. I have used a4j:poller tag which refreshes this page via ajax call and updates it. Earlier this was working fine but nowadays number of users have been increased. Issue is i get nullpointer exception after some time once i logged in to application and user gets redirected to login page. If user re-logins he gets directed to same page number before logout. There is no reason of throwing null pointer exception and this application works fine in qualification environment. We checked everything,
1) session is still there on server. thing is user gets disconnected from it.
2) Network bandwidth seems to be okay.
3) we have used hibernate eh cache and serialized java classes.
how to troubleshoot and find root cause for this. Some people say that it is due to ajax calls from multiple users and ajax response it getting lost in between.
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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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May 19, 2014
I'm using this methodology for Java connection between client and server, the server allows the user to stay connected while it is sending messages, but if you stay an average time of 5 minutes without send anything it is disconnected, I need to increase that time to about 30 minutes or disable this disconnection for inactivity.
Settings:
Netbeans 8.0
Windows Seven 64 Bits Ultimante
The following code:
package redes;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
[Code] .....
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May 19, 2014
I'm using this methodology for Java connection between client and server, I copied it from the internet, but the server allows the user to stay connected while it is sending messages, but if you stay an average time of 5 minutes without send anything it is disconnected, I need to increase that time to about 30 minutes or disable this disconnection for inactivity.
Settings:
Netbeans 8.0
Windows Seven 64 Bits Ultimante
The following code:
package redes;
import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.Font;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.PrintWriter;
import java.net.Socket;
[Code] ....
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Mar 11, 2014
I am new to work on JNLP program. I have created a SWING program, JNLP file when i deploy the ear file i am getting 404 error. Please find the steps in details.
1.Created a dynamic web project JWStartProject in eclipse
2.Create a HelloWorld.java class under default package.
import javax.swing.*;
public class HelloWorld extends JFrame {
private static final long serialVersionUID = 4968624166243565348L;
private JLabel label = new JLabel("Hello Java Web START!");
public HelloWorld() {
super("Jave Web Start Example");
this.setSize(350, 200);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
this.setLayout(null);
[Code] ....
Now I exported this project as JWStartProject.war contains following code.
Created Server in Websphere Admin console
Deployed this war file under the server and started.
I have added MIME types also.
I am unable to launch the application. I am getting 404 errors. May I know where I went wrong?
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Jan 13, 2009
I am currently trying to access an EJB Session deployed in a Weblogic server from JBOSS.
The client code looks like this :
Hashtable environment = new Hashtable();
environment.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");
environment.put(Context.URL_PKG_PREFIXES, "weblogic.jndi.factories");
environment.put(Context.PROVIDER_URL, "t3://<ip>:<port>");
InitialContext context = new InitialContext(environment);
ServiceHome home = (ServiceHome)context.lookup("ejb/Service");
When I run this code from a standalone java program it executes ok, but when I try to run it from an application deployed in JBOSS, the line (5) which creates the InitialContext object throws this Exception :
java.lang.ThreadDeath
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1221)
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1181)
weblogic.rmi.internal.StubGenerator.getStubClass(StubGenerator.java:696)
weblogic.rmi.internal.StubGenerator.generateStub(StubGenerator.java:742)
[Code]....
In order to be able to use weblogic naming factory I put the archive weblogic-8.1.6.0.jar in jboss's /server/default/lib directory. But I think it has to do with JNDI conflicts between JBOSS and weblogic.
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Jan 30, 2015
When i create an application Bean how i can update it from another bean? Lets say application Bean has variable h=1 and i want to update from another bean and make it 2 how i can do it? And how i can access the value of a session bean from another bean?
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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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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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May 22, 2014
i want to use EJB 3 in my WAS8 application but it doesn't work.First of all i created an remote-interface:
import javax.ejb.Remote;
@Remote
public interface EjbTestRemote {
public void doSth();
}
Then i created a session bean class:
import javax.ejb.Stateless;
@Stateless
public class EjbTest implements EjbTestRemote {
[code]....
But now i want to call the session bean from a normal (no servlet, no ejb) java class but i doesn't work (NamingNotFoundException):
try {
Context ctx = new InitialContext();
EjbTestRemote ejbTestLocal = (EjbTestRemote) ctx.lookup("java:comp/env/EjbTest");
ejbTestLocal.doSth();
} catch (NamingException e) {
e.printStackTrace();
}
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Jun 19, 2014
a new java executable file which does heavy processing (batch). Development hasn't really started yet and the design phase is just beginning. Now the client is asking us to give them the minimum server specs to be able to run our application..I'm thinking this can't be done without performance testing, which will be after development. Is there a better and faster way to be able to assess this?
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Oct 31, 2014
Is there any option to access OBIEE server home page through java, without sending username and password through URL.
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Mar 14, 2014
I would like to know how we can deploy one Web application on multiple server to share the work between them? My first thought is that we just deploy the same war file on different servers that connect to the same database. However, what will happen when a user enter something like [URL]? How can multiple servers share the same domain name and how the requests from different users are redirected to these different server?
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Sep 16, 2014
Any example of client/server socket based application using Spring and Maven where application do the following
Client sends a request with a path to any file on the server
„h Server reads the file and responds back with the content
„h Client outputs the content to the console
I am trying to follow this [URL] ....
I am using java 6
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Apr 25, 2014
I have developed a window based chat application for chatting, screen sharing, file sharing, video playing.
All are working well on my local network systems (eg. dynamic server ip is 192.168.1.122). But if i try to run on my server (e.g. static server ip 50.62.8.22) it is not get connected..,
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Nov 13, 2014
I am new to JMS and Websphere server and I am trying to access a JMS queue configured on Websphere Application Server 8 from my Java code. But I am getting the exception mentioned below:
Exception in thread "main" java.lang.NoClassDefFoundError: com.ibm.ws.naming.util.CommonHelpers
at com.ibm.websphere.naming.WsnInitialContextFactory.getInitialContext(Unknown Source)
at javax.naming.spi.NamingManager.getInitialContext(NamingManager.java:230)
at javax.naming.InitialContext.initializeDefaultInitCtx(InitialContext.java:313)
at javax.naming.InitialContext.getDefaultInitCtx(InitialContext.java:343)
at javax.naming.InitialContext.internalInit(InitialContext.java:281)
[code]...
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Aug 25, 2014
I am trying to deploy an android application that connects to a java server. I am doing an apointments system, so the client asks for an apointments with a specific office/doctor. What i did, was to create a java server, using object for the offices, and via sockets it communicates with the android client.
The problem is that when i tried to use my (very demo still) app on my phone and sent it to some friends for testing, i coulnt find a way to have my server on the internet.
So I changed to (or trying to) servlet. But, how to do a client server application with servlets. All tutorials i have seen are more on website clients, but thats not what i need.
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Apr 15, 2011
At our company we run a third-party Java-based GUI application on one of our Linux server machine, displaying the application to our local Windows work stations using the Cygwin X Server.We noticed a few problems with a new version of this application and was able to narrow it down to the following conditions:
1. Java Swing application running on a UNIX host;
2. Java used is 1.6 (problem not noticed when using Java 1.5)
3. Displaying to Cygwin X server (I've heard other windows-based X servers have the same issue, but I don't have access to any others at this time).
If we run the application natively on Windows, I'm told if the application runs on the Linux host and displays natively to that machine's display there are no problems (although I'm not able to verify this myself).The problems are:
1. Any new frame/dialog is opened in the geographic center of the dual displays, rather than in the middle of one or the other;
2. Any attempt to drag the window to a different location on the display seems to work, but as soon as you let go of the drag, the window snaps back to the original location. This only happens the first time you try to move each window.
3. Drop-down controls (JComboBox, for example) just close back up as soon as you click on them. If you click and drag the mouse to attempt to make a selection, no selection can be made.
Are these known problems using 1.6 on UNIX displaying to Windows-based X Servers?
The only real problem is number 3. I expect that if I put more work into the window placement, I should be able to get past number 1. Number 2 is just a minor annoyance.The following is a simple Java Swing application which when run in the correct environment will exhibit the problems.
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
[code]....
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Feb 27, 2014
I want to develop an application for client server play the Video On Demand (VOD).i am new for working on video player. Which library will suitable for this and what methods have to fallow.
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Jul 5, 2014
Deploy sample J2EE app to WebLogic server
A getting started app is fine, need to understand of deploying a sample application to WebLogic server. Any particular configuration during WLS install?
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Feb 21, 2014
I need to authenticate my client java application using ADFS enabled Sharepoint server.
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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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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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Dec 17, 2014
I have 2 war in 1 EAR.
War A corresponds to UI
War B corresponds to Rest
1) From War A, I login to the application and then fetch some users that is a rest call. I get the response back from rest in json form that ui consumes and display the data on page.
2) Now I click on the logout link from ui jsp. This logs out the session from Ui. I use <form data-dojo-type="dijit/form/Form" based logout.
3) I then go to the proxy (using burp) and manually request the rest call which I made in step no 1), the rest gives the response back with the same json object returned in step no 1) This shows that the logout action on step 2) is invalidated the session from War A (ui war) but the session or cookie based from WAR B (rest war) is not invalidated.
Expected outcome:After I Logout from War A(ui war), the session must also get invalidated from war B (rest war) and manually request from proxy should not get the same response object as received in step 1)
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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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Jul 27, 2014
I am developing a web application using JSF-2.0 on weblogic 10.3.6. I am using Facelets as VDL. I have 5 different machine. They are different according to their OS and their geographical location. On my first xhtml page server (machine) is decided. Then on next page file upload and rest of processing takes place. My restriction is that SSO configuration can be done on only one machine.
So I am restricted to using xhtml files from only my primary server where SSO configuration is done. But I have to connect to servlets or managed-bean of different machine as requests are machine specific and file needs to be uploaded to those machines for processing. So I cannot use redirectUrl as I need to be only on one machine. Is it possible that xhtml on one server can talk to managed-bean on other server(different machine)?.
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