(New subscriber) "Busy Page"

Hi,

Sorry if this has been covered before - I couldn't see anything in the
archive.

What I want to know is the best/preferred way to display a "Busy"
page/message while my servlet grinds away crunching numbers.

At the end to the processing I want my html report output to be
displayed 
instead of the "Busy" message.

I've tried lots of ways of doing this (redirects/imports via JSPs,
ServletFilters
etc) but nothing ever does the very task I required.  Surely this is a
very 
common task.

The only thing I've not bothered trying is firing off a separate thread
to
do my processing.  I figure there has to be a cleaner way.

Thanks in advance.
Chris

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