[Zope-dev] What can cause an InvalidObjectReference?

[Chris McDonough]

Hmm.. of course this is one of those problems that we can't fix without
replicating it and it doesn't sound terribly replicable at the moment.

- C


kosh wrote:
> 
> On Friday 24 August 2001 06:38 am, Chris McDonough wrote:
> > This will happen if yoiu've got a mounted ZODB database, and you attempt
> > to store an object in the mounted database which has references to other
> > objects in the "main" database (or vice versa).
> >
> > For more info, read the docs that ship with CoreSessionTracking.
> >
> > - C
> >
> 
> Interesting to know but unfortunately it doesn't cover this situation as far
> as I can tell. I have only one ZODB and the objects are stored directly in
> there. There are no other databases being used with it either (ie an SQL DB).
> The objects are CatalogAware though and do catalog themselves in the catalog.
> On the windows server this operation will cause the InvalidObjectReference
> nearly every time an object is created and much of the time when an object is
> changed. To make matters worse on the unix boxes the items create and catalog
> themselves just fine most of the time. On them the error seems to occur about
> once per week or so.
> 
> When I look in the Catalog though everything looks normal. It has a
> PrincipiaSearchSource that has the keywords I would expect along with the
> date it was changed etc. It is a default Catalog without any custom indexes
> etc added to it at this point. PrincipiaSearchSource for my object returns a
> string of all the words it wants cataloged.
> 
> Thanks again
> 
> > kosh wrote:
> > > When a product I have was stuck on a windows server this seems to happen
> > > a lot. On the unix servers I have been running the product on normally
> > > this seems to happen about once/week under pretty heavy usage.
> > >
> > > This is the error message
> > > Error Type: InvalidObjectReference
> > > Error Value: Attempt to store an object from a foreign database
> > > connection
> > >
> > > This is the traceback for it
> > > Traceback (innermost last):
> > >   File D:\ZOPE1\lib\python\ZPublisher\Publish.py, line 223, in
> > > publish_module File D:\ZOPE1\lib\python\ZPublisher\Publish.py, line 187,
> > > in publish File D:\ZOPE1\lib\python\Zope\__init__.py, line 221, in
> > > zpublisher_exception_hook
> > >   File D:\ZOPE1\lib\python\ZPublisher\Publish.py, line 175, in publish
> > >   File D:\ZOPE1\lib\python\Zope\__init__.py, line 235, in commit
> > >   File D:\ZOPE1\lib\python\ZODB\Transaction.py, line 300, in commit
> > >   File D:\ZOPE1\lib\python\ZODB\Connection.py, line 375, in commit
> > >     (Info: (('Products.CompoundDoc.inputtext', 'InputText'),
> > > '\000\000\000\000\000\000-t', ''))
> > > InvalidObjectReference: (see above)
> > >
> > > I am mostly wondering what kinds of things in my code could cause this
> > > problem. Mostly I need a place to start to try and debug this.
> > >
> > > The "fix" I have normally used is that if I hit refresh the problem will
> > > go away until it happens again. It just allows you to keep working with
> > > it again until whatever it is that causes it causes it again. I hope that
> > > helps some also.
> > >
> > > Thanks
> > > Kosh
> 
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-- 
Chris McDonough                           Zope Corporation
http://www.zope.org                    http://www.zope.com

""" Killing hundreds of birds with thousands of stones """