Unable to use javascript to close existing window in jsp

Hi experts,
In my jsp, i've a code that prompt user to download the file (using response.setContentType) to their machine within a try and catch statement.
I would like my existing window browser to close immediately after the prompt to the user.
I tried using javascript window.close() but there isn't any effect. I even place my javascript code at the end of the jsp code but also no effect.
In fact, i tried to print something out using out.println() there isn't any effect at all either. So I tried using system.out.println(), it works. (printed out in my tomcat)
Anyone know what should I do in order to close the window?
Thanks!

hmm.. actually i don't really get what you mean.
For my case, I didn't use window.open.
what happened is, i have a html page that prompt user to enter a name for their file. after the user has entered the name, it will submit as a form to a jsp page to do some file conversion. then pass to another jsp page to prompt user to save the file to disk.
the window was pop up for the downloading of file to disk, but behind it, the html window that was pop up earlier (window that prompt user to enter the name) was still there.
eg: a.html -> b.jsp -> c.jsp -> new window for saving of file
window for a.html still around.
In this case, can i still use your method?
Thanks alot!

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