[Zope] ZClass upgrade problems

[Dieter Maurer]

Finally, we want to upgrade from Zope 2.1.6 to 2.3.2 (Python 2.1).

We now experience what many have recognized already:

   ZClasses are a bit volatile wrt. Zope upgrades


I created a distribution under 2.1.6 and unpacked it
in the new Zope 2.3 CVS (taken shortly before the 2.4 development
hit the CVS).

After a restart, I see the following message in the Zope log file:

> ------
> 2001-06-14T05:46:02 ERROR(200) ZODB Couldn't load state for '\x00\x00\x00\x00\x0
> 0\x00f\xc2'
> Traceback (innermost last):
>   File /home/dieter/tmp/ZopeCVS/lib/python/ZODB/Connection.py, line 533, in sets
> tate
> ImportError: No module named *EDd7FLD+AY2OWsUAz/H7bw==
> 
> 
> ------
> 2001-06-14T05:46:14 INFO(0) Zope A broken ZClass dependency was found in the glo
> bal class registry. This is probably due to a product being uninstalled. The reg
> istry has successfully been rebuilt.


The imported ZClass is there, but when I try to view the
"Basic" tab or try to do anything with a corresponding Z Instance,
I get a "TypeError" exception: "String or Unicode string expected,
None found".
I have analysed this problem:

  During commit, a "DispatcherClass_ZPropertySheetsClass" instance
  should be pickled ("DispatcherClass" is my ZClass).
  This fails, because the class' "__module__" is "None".


Two questions:

  1.  what is this strange module, that could not be loaded?

      In fact, I would be very astonished, if it could.


  2.  what should "DispatcherClass_ZPropertySheetsClass.__module__" be.


Dieter