redirecting once jsp buffer has been flushed

I need to display an animated image to the client whilst some server side processing is carried out. In my code I flush the buffer, perform the server-side code and then want to redirect/forward to another jsp.

How can I do this as If I do a sendRedirect will get an illegalstateexception

Thanks In Advance
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inzaghiAuthor Commented:
come on experts!
you cannot do a redirect after some response  has been sent

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Mayank SAssociate Director - Product EngineeringCommented:
You can only send the response to a request once. If you want asychronous processing in a web-app, use AJAX.
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inzaghiAuthor Commented:
To do the redirect I can use window.location. This is working fine.

But when I flush the browser the html is not being flushed to the client at the point it is done, instead it is done at the end of the processing. Any ideas?
I've seen you are seriously trying to implement a progress indicator for your JSP page
you can get the idea used in this ASP tip
Mayank SAssociate Director - Product EngineeringCommented:
>> To do the redirect I can use window.location.

That would run at the client-side, not the server-side.
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