I have a servlet that starts a long series of calculations.
The calculations can take up to 30 minutes.
This leads to 2 problems:
1. The timeout of the server is less than 30 minutes,
so we get a 'document contains no data'.
2. We don't want to raise the timeout, because a user
won't usually wait that long.
We thought of the following solution:
1. The user calls a servlet.
2. This servlets starts a process in background that calculates
a result and writes it to a file on the server.
3. The user gets an immediate response with the URL of this file,
so he can visit this URL once the calculations are finished.
What is the best way to do this? A servlet calling another servlet?
Starting a thread (but won't this thread be killed once the servlet
has sent his response)?
Is there a means to let the user know when the calculations are done
to prevent 404 errors or having to look at an incomplete result?
Thanks in advance,
Bruno
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