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Editorial Team
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Asked: 2026-06-04T17:02:34+00:00

I’m working on porting a desktop application (WinForm) to a web application (Java/Spring/JPA). The

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I’m working on porting a desktop application (WinForm) to a web application (Java/Spring/JPA). The problems are many and I’m struggling a bit…

Now the problem is threading!

In the original application, that performs the export of certain data from the DB, there is a progress-bar indicating the progress of the process.

I want to port this progress-bar in the new web application. To do this I thought of using AJAX and use a separate thread to run the data export.

The main concerns are:

  • Am I following the right approach? Are there problems using multi-threading in web applications?
  • If during the export process F5 or refresh button are pressed what exactly happens? How can I stop the process?
  • How do I update the progress bar periodically? Do I have to make calls via ajax to the server?
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  1. Editorial Team

    Find my answers Inline

    I am following the right approach? Are there problem in using multi-threading in web applications?

    -Yes you are on correct path. No there is no such problem in multi-threading in web application and its as easy as you do it in WinForm. Instead of using Dispatcher to update the UI, you would be making AJAX calls and with javascript DOM manipulation would take place.

    If during the export process F5 or refresh button are pressed what exactly happens? How an I stop the process?

    -Unfortunately there is no easy way. The standard way is, when such kind of processing is done and the user hits F5, you would show a dialog(with help of javascript) and inform user that the job is still running. If the user still wants to refresh then you have make another request to the server for cancelling the task.(You need to store thread id or cancellation token some where to cancel the task)

    How do I update the progress bar periodically? Do I have to make calls via ajax to the server?

    -The standard way is, generally you show show a loading image. IF you want to show a context senstive progress bar, it would mean you have to do polling. Here is an example by Dino Espito. Though its in ASP.NET, you could understand the underlying principle
    Dino Espito

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