This week's book giveaway is in the Mac OS forum. We're giving away four copies of a choice of "Take Control of Upgrading to Yosemite" or "Take Control of Automating Your Mac" and have Joe Kissell on-line! See this thread for details.
Requirement is not clear...but my understanding is that
1)You have a form in jsp page
2)You submit it
3)Generate the bar code
4)Show it in browser in previous jsp page
If that is it...
You could have a check in jsp like...