Hi Kristian look at http://coldjava.hypermart.net/servlets/waittag.htm I hope this will help you. Bye
Giorgio Kristian Rink ha scritto:
Hi all, being aware that this is not a question strictly tomcat-relevant, lacking a really good mailing-list for discussions closer to the J2EE background itself, I hope for some input by all the gurus out there. I'm into a situation like this: A servlet gathers statistical information across the data in our DMS, is supposed to make a PDF out of them and send them back to the client who requested them (PDF is demanded). Problem, however, is that sometimes these computations take quite some time, leaving me with two situations: (a) The browser itself considers the connection to be "timed out" as the servlet is stuck in doGet() for a bunch of minutes. (b) The user itself considers the connection to be "dead" and closes the browser window. Both situations are uncomfortable. By now, my initial idea was something like that, utilizing two servlets: - Servlet 1 processes the request and immediately redirects the client to another servlet while finishing the calculations and creating the PDF file. - Servlet 2 refreshes, say, each 2 seconds, checking whether the file in question finally has been created and put in place to, then, send this back to the browser. This, however, doesn't work out as Servlet 1, even though sending the Redirect, doesn't redirect until leaving doGet(). So, that's not the solution... My question, now: Is there any "usual" / "best-practise" way of doing something like that, of presenting people with a "please-stand-by" page while there is activity goin' on in background? Is there a way of solving something like this without being in need of JavaScript/AJAX/DWR or something the like? Any hints, even just pointers to good documentation on that issue, are very much appreciated. Thanks and bye, Kristian
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