I also use HappySession and when catching the SessionNotFoundError
weird things happen: 
here my  code:

<dtml-try>
   <dtml-call "SESSION.set('FLinkID','0')">
<dtml-except>
session error!
</dtml-try>

When the session is expired the error is not caught correctly and I get the error 
mentioned below. Plus, I have to restart my server because ZODB reports a 
transactional error and sets itself to read-only.


thanks
Philipp Auersperg (zwork)
-----------------------------------
  Zope Error
Zope has encountered an error while publishing this resource. 

Error Type: KeyError
Error Value: SessionUID
-----------------------------------
and the traceback:
Traceback (innermost last):
  File /usr/local/Zope-2.1.4-linux2-x86/lib/python/ZPublisher/Publish.py, line 214, in 
publish_module
  File /usr/local/Zope-2.1.4-linux2-x86/lib/python/ZPublisher/Publish.py, line 179, in 
publish
  File /usr/local/Zope-2.1.4-linux2-x86/lib/python/Zope/__init__.py, line 202, in 
zpublisher_exception_hook
    (Object: ElementWithAttributes)
  File /usr/local/Zope-2.1.4-linux2-x86/lib/python/ZPublisher/Publish.py, line 169, in 
publish
  File /usr/local/Zope-2.1.4-linux2-x86/lib/python/ZODB/Transaction.py, line 275, in 
commit
  File /usr/local/Zope-2.1.4-linux2-x86/lib/python/Shared/DC/ZRDB/TM.py, line 120, in 
tpc_finish
    (Object: TM)
  File 
/usr/local/Zope-2.1.4-linux2-x86/lib/python/Products/HappySession/HappySession.py, 
line 168, in _finish
    (Object: TM)
  File 
/usr/local/Zope-2.1.4-linux2-x86/lib/python/Products/HappySession/HappySession.py, 
line 291, in _onTransactionEnded
    (Object: SESSION)
  File 
/usr/local/Zope-2.1.4-linux2-x86/lib/python/Products/HappySession/HappySession.py, 
line 255, in _store
    (Object: SESSION)
KeyError: (see above)


*********** REPLY SEPARATOR  ***********

On 31.08.2000 at 19:03 Hung Jung Lu wrote:

>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 
>centralized way.
>
>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.
>
>regards,
>
>Hung Jung
>
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