[Zope] UnpickleableError with objects derived from Sync.Synchronized

[Alexei Ustyuzhaninov]

OK, but it seems to me that the unpickleable object resides in 
Sync.Synchronized. Without mixing in this class objects of my class are 
created easily (though have problems with multithreading lately).

Chris McDonough wrote:

> This signifies that your instance has a reference to another object that 
> cannot be pickled.  For a list of items that are pickleable (and 
> therefore storable in the ZODB), see the Python documentation.
> 
> Alexei Ustyuzhaninov wrote:
> 
>> Hi!
>>
>> I have objects in my product which shouldn't be accessed 
>> simultaneously by different threads. So I mixed their class in the 
>> Sync.Synchronized class as recommended in 
>> http://www.zope.org/Documentation/How-To/ThreadSafety. But now I can't 
>> even create the objects because of UnpickleableError:
>>
>> Traceback (innermost last):
>>   File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 223, in 
>> publish_module
>>   File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 187, in 
>> publish
>>   File /usr/lib/zope/lib/python/Zope/__init__.py, line 226, in 
>> zpublisher_exception_hook
>>   File /usr/lib/zope/lib/python/ZPublisher/Publish.py, line 175, in 
>> publish
>>   File /usr/lib/zope/lib/python/Zope/__init__.py, line 240, in commit
>>   File /usr/lib/zope/lib/python/ZODB/Transaction.py, line 302, in commit
>>   File /usr/lib/zope/lib/python/ZODB/Connection.py, line 418, in commit
>>     (Info: (('Products.Tap3Editor.tap3editor', 'tap3editor'), 
>> '\x00\x00\x00\x00\x00\x00j\x08', ''))
>> UnpickleableError: (see above)
>>
>> I use zope 2.4.2 for linux from debian binary distribution.
>>
>> So could someone explain what's the problem here?


-- 

Best regards,
Alexei Ustyuzhaninov