----- Original Message -----
From: "Sven Jacobs" <[EMAIL PROTECTED]>
I have a serious problem with Zope. Every time a certain page is requested
by a web browser for the second or third time (first time always works)
the whole Zope server crashes :-(
The only thing special about this page are calls of external Python
methods from a custom extension. These methods don't do any special magic.
They just open a MySQL database (using the MySQLdb module version 0.9.1)
and return some HTML output.
I was able to catch a somewhat informative error message when Zope was
running in debug mode:
2006-03-27T12:18:57 PANIC(300) z2 Startup exception
Traceback (innermost last):
File /opt/zope/z2.py, line 495, in ?
(Object: ZLogger)
File <string>, line 1, in ?
File /opt/zope/lib/python/Zope/__init__.py, line 37, in ?
File /opt/zope/lib/python/ZODB/FileStorage.py, line 202, in __init__
File /opt/zope/lib/python/ZODB/lock_file.py, line 29, in lock_file
StorageSystemError: Could not lock the database file. There must be
another process that has opened the file.
It sounds like your external method is causing the problem, and an easy way
to test this is to remove all of the code from the external method (ie. just
turn it into a test stub routine) and see if the error goes away. If this
works, then add code back into the external method, one logical 'chunk' at a
time and test. Continue this until you add in the chunk of code that causes
the error. It can often be useful to add debug info into a python list
object, as your external method progresses, and then return this list to the
calling routine (which then displays the contents of the list within your
normal html page).
HTH
Jonathan
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