Response completely written by servlet - how can a filter find out?

hi!
i am working on a servlet filter and i need to wait for the whole response to be written by the underlying servlet before the filter can start processing it.
it's no problem, if the servlet closes the stream or writer at the end of the service method.
But if it does not like in the following snippet, i am in trouble :-/
out.println("html, html, html");
out.println("</html>");
// NO out.close();
So my question is, is there any possibilty to check for the end of the service-method or something like that?
It seems to be quite common, not to explicitely close the stream. even the most basic servlet tutorials don't do it very often. so i guess, i have to deal with this case.
thanks in advance!

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