Java Web Scanner [closed]

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I have a working java web app for document management. On document creation i have a file attachment option that works perfectly.

But now i'm supposed to implement the following functionality:

When user creates document from web browser he can press the button called "Scan" that will scan the document in his scanner (HP scanner or Cannon) create a pdf out of scanned pages and attach this pdf to document.

So it's an auto scan magic functionality.

Now is this even possibly? I know that some requirements are insane but i can't do anything about it, my employee is desperate to have this functionality in his web document management.

I'm frustrated and clueless of how can i implement this in java web app?

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You have to develop a Java Applet to put in your web page, using a Java Twain Implementation such as JTwain.