I just finished listening to this talk here at the Cocoon GT and boy! How I wish I had been able to know about its conclusions earlier (in a nutshell: Xalan 2.4 sucks). I have a customer who has been having memory problems with a Cocoon application under load for some days. The least expensive and resolutive move, in retrospect, would have been upgrading Xalan to release 2.7: painless and probably definitive.
Actually, I had suspected problems with the XSLT processor for a while, but not trusting Xalan I had suggested replacing it with Saxon, which would have probably been less painless, as Saxon is much more strict than Xalan when it comes to not-so-kosher stylesheets.
In any case, this lesson should be useful for the future.
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