I've found this ajax tag library framework. It's very simple in philosophy. You select a zone on your jsp, you send a get or post using the ajax javascript, it goes to the server passing through a filter, your servlets recreate the page, the filter filters returning only the zones that were invalidated. It's very easy and I recommend it even though it's visible there are some quirks to be resolved.
It doesn't try to introduce new tags like ajaxtags but that I think is it's simplicity and flexibility. Another prominent library is the DWR but I found it a bit more intrusive although I haven't tried it yet.

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