Servlets :: Offline Tasks In Java Web Application
Feb 11, 2014
I am on developing a web application (using struts). So most of my web application use cases are reading and presenting data to the users.
But i need to write the another set of programs to keep on reading the data from another data bases and update my database. I have list of timings at which i should read the data from each of other sites (i.e. i know when the other databases gets updated information). Its almost every 20 mins..
Now i want to design the app.
1. Should i include the data read programs as part of my Web application ( means runs in same server JVM) and make the threads as daemon threads..?
2. Should i write another application (offline application) runs out of server in another JVM ?
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Dec 15, 2014
Creating web application which needs to work online and offline as well with database. There is chances of using the application in offline when there is no internet connection. The application going to be used for getting inputs for some inspection process which may happened remote areas as well.
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Apr 2, 2015
On Form Submit my url changes from
1.localhost:8080/Workflow/admin/GetReports?fname=Form1
to
2.localhost:8080/Workflow/admin/EditReport
Form action is EditReport(Servlet Name).
Now on EditReport i perform the databse operations and forward the request to the GetReports?fname=Formname Servlet using Request Dispatcher.So that i am on the same page which is the first one (1) i started from.
Now Everything works fine on the .jsp page But the url remains unchanged that is the second one (2).
Now if i hit the URL again i.e. localhost:8080/Workflow/admin/EditReport it will give an error.
So how to rewrite the url i.e. from admin/EditReport to /admin/GetReports?fname=Formname after performing all the operations.?
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Apr 5, 2014
how to perform certain task on the shutdown of a web application in java
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Apr 13, 2014
// MY login.jsp class
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<jsp:useBean id="person" scope = "request" class = "com.za.tutotial.mvc.PersonBeanModel"/>
[Code] ....
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Dec 4, 2014
How to upload file to google drive using java. my java code is.
HttpTransport httpTransport = new NetHttpTransport();
JsonFactory jsonFactory = new JacksonFactory();
GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
httpTransport, jsonFactory, CLIENT_ID, CLIENT_SECRET, Arrays.asList(DriveScopes.DRIVE))
.setAccessType("online")
.setApprovalPrompt("auto").build();
[Code] ....
So in that file object(java.io.File fileContent = new java.io.File("document.txt");) asking complete file path. But in file upload we can get only file name not path.
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May 28, 2014
I am looking for pure java API to be able to create/read outlook tasks.
Any open source API's available for the same.
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Nov 17, 2014
convert or move standalone java thread application into Tomcat server container for accessing its JNDI services? Also is it possible to schedule this thread application in Tomcat server? is it possible to keep this app in tomcat as web application and schedule in window's scheduler.
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Jun 14, 2014
I have to forward my request to another webApplication using post request parameters. In this case Webaplication-1 need send request using post request params to Webapplication-2 & once Webaaplication-2 receives request it has to process & display output.
For this have tried below 2 options which Servlet API provides.
1. RequestDispatcher : this will used to forward request to another resource within the application.
2. sendRedirect() : this method support doGet() of Servlet.
3. Using HttpClient, which is provided by Apache able to do but it will not displaying Output,It sending back response to Webapplication-1 .
Is there any option which will handover request from one webapplication to another webapplication.
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May 27, 2014
I now know the basics of JSP and Servlets and I am going to make my own web app (shopping cart).I am having great difficulty in making a blue print for my code. But, I don't know if my blue print is useful or even missing something. where I can learn a formal process to make blueprints (not algorithms or flowcharts) for my code/web app ? I want to be able to make such amazing blueprints, that a beginner coder could simply follow the requirements and do all the coding himself.
What I did so far -
1 - Finalize a small list of features in the app.
2 - Identify all the entities or classes needed for the app - Customer, Product, ShoppingCart, etc.
3 - A list of all the web-pages/servlets/jsp's that the app might require.
I wonder if I can start coding right away. I hope that I have not missed something which will bite me later and will require a whole rewrite of the code.
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May 30, 2014
I have to send a request with post parameters from one web application to another web application,both are running different servers.
In my application i don't have any JSP,html only controller part which will handle request extract request parameters & based on request params i'll do a web service call.
My current requirement is based on request parameters i'll send request to another web application with received parameters.
I tried with sendRedirect() ,but it support only get() method.
how to proceed further.
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Apr 13, 2014
I am trying to design properly a simple 1to50 game (yes, the one that is so popular among mobile apps), but as a web application that allows two player games. I tried to document myself on the technologies I could use and came to the decision that some kind of Java would be suitable. I know that HTML, HTML5, CSS, JavaScript are client side languages with what I can basically design the client application that runs on a web browser. I installed Tomcat web server, configured Java Servlet API, done some research on Servlets and JSP, but I still cannot really imagine how all of this can work. Servlets form the Controller, JSP files the Model? How can I make them communicate, how can Servlets "tell" JSP files what to dynamically generate? Can JSP files communicate with JavaScript? Is JavaScript even necessary?
I thought that this question is not basically about a specific thing regarding JSP or Servlets, more about design and general concept, that is why I put this question under beginning Java.
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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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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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Feb 14, 2014
We generally use [URL] ..... for running web applications.
What I want is to access my web app using something like this: [URL] ....
How to achieve this? Actually what i want to ask is that how URL like WWW.example.com is mapped to web applications? Assuming that i am using tomcat server.
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Feb 6, 2014
I am working on an application, which paradigm is correct for implementing:
Client Side: Web Application (HTML/JSP/Servlets)
Intergration: Mule ESB
Client will call Mule ESB flow using HTTP URL and get response from the same..I have two way outs
1) We call Mule ESB from HTML directly and Mule ESB send response back to another JSP page. Then, I need to mention page name inside, Mule ESB flows.
2) Or We call Mule ESB from controller(servlets) and Mule ESB send response back to servlets and then servlets redirect to correct page with manipulated data.
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Nov 20, 2014
I have a web app using spring MVC + hibernate on the server side and jquery, ajax, javascript on the client side.
What I wish to do is to convert it into an exe file to make it standalone app.
Is there a software out there that can accomplish it? I don't want to recreate it from the scratch and I only know how to do web apps.
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Aug 30, 2010
In our web application we are using servlets,jsp and spring technologies.Here we are also maintaining session mechanism in our application.But now i need to count number of users accessing our web application at a time. How can i implement this mechanism...
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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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Jun 2, 2014
I want to implement a 'Keep me signed in' option in the login page of an application. I have noticed this option is present in the form of a checkbox on the login page of many websites but i don't know how it can be coded . When selected, a user is no longer asked for his username and password on subsequent sessions but he is automatically given access.
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Jan 28, 2014
I need to track the client IP address from where user requested to my application.
I tried following:
request.getHeader("HTTP_X_FORWARDED_FOR"));
request.getHeader("X-Forwarded-For"));
request.getHeader("Proxy-Client-IP"));
request.getHeader("WL-Proxy-Client-IP"));
request.getHeader("HTTP_CLIENT_IP"));
request.getHeader("HTTP_X_FORWARDED_FOR"));
request.getRemoteAddr());
String ip = InetAddress.getLocalHost().getHostAddress();
In which InetAddress is giving my local machine IP when i run my application in localhost, but I mapped localhost:8080 with IIS server then InetAddress not giving exact IP address. How can we resolve this?
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Oct 11, 2014
For one of my project, required to capture the audit history reports of all the activities of the users within the application.
We are using Servlet/JSP in J2EE environment.
For Ex: Whenever user updates some fields, we need to capture the Old value, new value, user id and time stamp. We have single form with more than 200 fields.
Just want to know the best way to do this..any frameworks available for it...or doing at the database side like using triggers..
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Aug 3, 2014
I have a jButton that when the action perform runs it only does part of the tasks some of the code doe not appear to run and i just can not figure out why i have tried wrapping parts of it in an if statement and it still do not run so here is the code behind the button:
in the code the parts that do not run are jTextField10.setText("Working Please Wait"); and jButton15.setVisible(false);
what i am expecting to happen is the text field has the words Working Please Wait placed in it , this does not happen and the button should be hidden to prevent it being clicked a second time again this does not happen
the rest of the code works as expected
InputStream inStream;
OutputStream outStream;
try {
File afile = new File("C://templates//amendments.xls");
File bfile = new File("C://amendments.xls");
inStream = new FileInputStream(afile);
outStream = new FileOutputStream(bfile);
[code]....
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Jun 4, 2014
I have a library that uses a ThreadPoolExecutor, backed by a bounded queue.
We submit a large number of tasks to this executor, constantly polling an external dependency for new work. However, this executor has a fixed size. When a ThreadPoolExecutor is busy, it queues up to the blocking queue's capacity tasks in its blocking queue, at which point it starts rejecting tasks.
What I'd rather do, instead of requesting more work, and then throwing it out, is to detect that we're totally busy and stop requesting work until a thread frees up.
Now, I know that one approach is to rewrite the workers such that they are infinite loops, who poll for work when they're finished. Due to the large number of consumers of this library, this is not an option.
I have come up with two other solutions.
1) This is one that I know will work, which is to use a semaphore or other concurrent counter to track how many tasks I have submitted, and stop requesting more work when that semaphore is out of permits. The processors release a permit when they complete (whether due to exception or success).
2) The other option, since I know this is a ThreadPoolExecutor, is way simpler, but also is something I'm not sure is reliable.
I can compare executor.getActiveThreads() + executor.getQueue.size() to the maximum number we can handle before rejecting (maxThreads + queueSize). This change is far simpler, but I'm not sure if those calls are a reliable way of counting the current work.
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Feb 12, 2015
This has three different classes in a package and the program itself is supposed to read and perform operations obtained from a txt file. However, I'm not even sure how to get it to perform the operations from the text file. I know that it can read the file as I was able to get the program to print the text found in the file when I ran the program with a test print to make sure that all content was being read. However, I am clueless when it comes to how to get the program to look at the text as commands.
Here is the piece of code that I am not sure where to go from as far as telling the program to read the text and perform the tasks listed.
public static void doTVoperations(){
File operations = new File("operations.txt");
if(operations.exists())
try{
Scanner n = new Scanner(operations);
[Code] ....
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Jul 14, 2014
I need to know how to automate a web browser (either Chrome, Firefox or Safari) to perform the following task.
Take a word from a .txt file housed on my hard drive,
1) put it into a search engine,
2) load the results,
3) click on/ open the first result,
4) open up an new tab and perform steps 1-3 again but with the next word from the .txt file. 4-5 second pauses are needed in between each step.
Additionally, I would like to automate the browser to close all the open tabs when a full stop is pulled from the .txt file.
I am using a macbook and 10.6.8 OS.
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