My conjecture now is that your error-handling HTML might be accessing
attributes from Zope server. A more correct way of handling exceptions
should have been using the <dtml-try>...<dtml-except>...</dtml-try> block.
But I kind of make a cheat sheet recipe recommendation, tweaking the
standard_error_message, which was not a good idea. When Zope arrives to
standard_error_message, the transaction has been aborted and if your
session_not_found_html is not simple enough and uses more DTML features, I
can see that it can cause transaction error.
Can you send me your session_not_found_html? I think this was the problem.
In the future I will remove the standard_error_message trick from the help
file and instead tell people to use proper exception handling, which is the
right way of doing things. But it will require people to structure their
sites more carefully so they can catch the SessionNotFound exception.
Basically, it is recommended that you have single (or few) index_html on
your site, and place a <dtml-try>...<dtml-except ...>...</dtml-try> block to
capture all exceptions from Zope and deal with them. It's the right way of
doing things, it's just that many people tend to have many index_html and it
will make their site harder to catch exceptions and deal with them in a
In short, HappySession itself is probably not the cause of the transaction
error. The problem probably comes from bad exception handling. If you want
to use the standard_error_message trick, then please use a simple html page
for session_not_found_html without additional Zope features. If I find out
more, I'll let you know.
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