I occasionally get tracebacks like No input for required field <!-- Traceback (innermost last): File /home/killer-whale/skip/src/Zope/lib/python/ZPublisher/Publish.py, line 222, in publish_module File /home/killer-whale/skip/src/Zope/lib/python/ZPublisher/Publish.py, line 136, in publish File /home/dolphin/skip/src/Zope/lib/python/ZPublisher/HTTPRequest.py, line 445, in processInputs File /home/dolphin/skip/src/Zope/lib/python/ZPublisher/Converters.py, line 115, in field2required ValueError: (see above) --> mailed to me from my production web server (5-10 times per day). I have been so far unable to figure out what request is coming into Zope that is triggering it by examining the Zope and Apache server logs (I run Zope behind an Apache proxy). Every time I search the log files in the vicinity of the mail message's timestamp, I see nothing wrong. I would like to instrument the Zope code to generate a traceback that has a more useful message than "(see above)". The ValueError is being raised in field2required, but I see no parameters in the Apache log with a name of "...:required". That leads me to suspect that somehow the RESPONSE parameter isn't getting set (it's the only non-defaulted parameter in the suspect published methods that doesn't appear to have its value set directly by parameters in the URL). I am completely unfamiliar with the code involved in the above traceback, and only get such tracebacks on my production server, so I need to get it right the first time. (If I muff it, it will almost certainly not break until right after have watched it for 10 hours, then left for the day, allowing the server to choke for 12-15 hours before I come in the next day...) I'd like to enclose one of the calls in the above traceback in a try: ... except ValueError: ... statement whose except clause reraises the exception with the relevant data that will tell me just what method was invoked and what parameters, if any, it's receiving. I think the HTTPRequest class probably contains the useful bits, but I have no idea what those bits might be. (What is the saying about things that are sufficiently subtle appear to be magic to the observer?) Thanks, -- Skip Montanaro (skip@mojam.com) http://www.mojam.com/ http://www.musi-cal.com/