Servlets :: How To Deploy One Web Application On Multiple Server
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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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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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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Jul 16, 2014
I need to write server side program(Servlet) which must be access by several requests at same time.how to handle this using java? Do i need to use queue or multiple instance of same class. Any example server method which returns the results based on ID
public String getResut(int id){
1)get db connection
2)get the result from db
3) retun the result
}
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May 13, 2014
I have a large scale enterprise application (5 modules) project using RAD, WAS v7, Java EE 6 (EJB 3.1, JPA), ZK framework.
The project is using RAD as IDE. The problem is that it takes too long to deploy (more than 5 min) when changes are made to the EJB's (although the changes are minor in only one file) but when changes are made to zk framework (the web & presentation layer), it is fast to deploy.
Don't know what cause the problem. Is it because of EJB 3.1/ JPA or RAD/ WAS?
Is it happening in other IDE or applcation server also?
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Aug 1, 2014
I have data base connection which i have configured via a listener class i configured properly in DD but still i am not able to deploy the project and server log show that startL.java listener class was not found why is this so as config is proper with the name
here is my server log
[2014-08-01T20:53:59.112+0530] [glassfish 4.0] [SEVERE] [] [javax.enterprise.system.core] [tid: _ThreadID=34 _ThreadName=admin-listener(3)] [timeMillis: 1406906639112] [levelValue: 1000] [[
Exception while loading the app : java.lang.IllegalStateException: ContainerBase.addChild: start: org.apache.catalina.LifecycleException: java.lang.IllegalArgumentException: java.lang.ClassNotFoundException: contpack.startL.java]]
**if i remove the Listener tag then app runs fine**
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Feb 21, 2015
How to deploy Java Swing application as windows software. I have tried the following to do this :
I have created jar file for my project after that created exe file using Launch4j and Advanced installer, exe file produced by both software are working fine but those are placing the jar file inside that exe file, My problem is any one who has that exe file can extract and view the source code by decompiling java class file. Is there any way to deploy java application without decompiling the code.
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May 30, 2014
I developed an application that is accessing some property files. The condition was that the user should be able to modify the content or parameters of those property file.How can I distribute the application using Java web start that also includes those property file in the client side?
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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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Apr 1, 2014
I am working on a chess game. I need to construct a game room where all the player are present and room chat is up. Also some tables where games are being played. Now my question is how to create this game room?
To me this room must need to be like static or global (if I am not mistaken) that is up when server starts and players can join this room and should be down when server is done. How can I implement such room that would stay up for infinite time.
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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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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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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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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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Dec 20, 2014
I am new to Servlets and came across it in Head First Java 2nd Edition. I wrote the servlet code. I don't know how to run it. Do I need to set up a server?
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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 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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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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Feb 1, 2014
If we have request which hit the server, before it reaches servlet or the response going to send the browsers, through how many components it pass through (or the process flow).
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Feb 20, 2014
i want to publish data from my application to mobile devices as calendar-events and back.therefore i want to write an application (webservice, servlet,???), which i then can add as a new account in my e.g. android device' calendar.
shortly: my application should simulate an exchange-/activesync-server, since on "all" mobile devices i can add exchange accounts.is/are there any documentation, libraries,
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Feb 21, 2014
I need to authenticate my client java application using ADFS enabled Sharepoint server.
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Mar 31, 2014
It sounds simple enough, but I'm trying to implement a mechanism to prevent the same user logging into our distributed web application simultaneously.
So, given the scenario...
- user A logs in with username A
- user B logs in with username A
I want the logging in of username A by user B to invalidate the session for username A held by user A. So if people are sharing login credentials, the last person to log in kicks everyone else out who's logged in as that user.
The big problem I have is the application is deployed in a cluster across JVMs, so sessions are shared across nodes. My thought it to introduce a session listener to then inspect a table in the database which determines whether that user logged on - the part of identifying that is pretty simple as far as I can tell. The difficult part is kicking out the first user who logged in.
So, I guess my question is - can I invalidate an http session from with an MDB? If so my logic is to implement an MDB which listens on a topic and whenever a session is created that MDB checks for sessions belonging to the same user within that JVM to invalidate them (obviously skipping the JVM the login request came in on!).
Is that even possible? Is there a simpler way to do this?
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Aug 11, 2014
I'm new to json and the web. My purpose is to use json data from a server and parse it and show meaningful data to the user. I am aware of json parsing, so no sweat there. However, I would like to know how json data is sent to the front end after which it can be parsed.
Usually in my json parsing examples, I have a variable like var data = ]OR I do a getJSON on a data.json file which I have stored in the project folder. However, I want this data to come real time from a servlet. How to go about this?
So, basically my question is, how do I send real time json data from a servlet backend, say some records which I have extracted from the database using jdbc?
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