[Glass] Weird problem with class instance variable

Mariano Martinez Peck via Glass glass at lists.gemtalksystems.com
Tue Aug 25 13:49:33 PDT 2015

Mmmmmm  let me explain something else... I the instances of
FaBackgroundProcess I used to hold the exception occurred (GsProcess). Such
a GsProcess (part of the stack) was pointing to the class
FaBackgroundProcess. I just inspected FaBackgroundProcess, inspect the
'Instances' , I got the collection, and I nil'ed the 'exception' instVar
from each instance. Therefore, there was no more instance to THAT
FaBackgroundProcess class. Now, either if I inspect FaBackgroundProcess OR
send #intances now I see all empty and both being same OOP.

So..what was going on for some reason is that the 'exception' stored in the
FaBackgroundProcess instances were referencing ANOTHER instance of the
class FaBackgroundProcess. Some days ago I added a instVar to
FaBackgroundProcess and I did the typical #doBulkMigate since I didn't need
anything special for this new instVar. So...could something with the
migration make the already existing instances of FaBackgroundProcess point
to another class? This all would make sense if classHistory size would have
answered me something > 1, but it was still saying 1.

so the problem is solved, but it would be nice if I could find an

Thanks for you help guys.

On Tue, Aug 25, 2015 at 5:33 PM, Dale Henrichs via Glass <
glass at lists.gemtalksystems.com> wrote:

> Mariano,
> That is indeed odd behavior ... I would be suspicious of multiple versions
> of the class ... take a look at the oop of the class that you are sending
> the message to and the oop of the class you are inspecting ...
> Other than that I can't imagine the cause ... one step at a time though:)
> Dale
> On 08/25/2015 01:03 PM, Mariano Martinez Peck via Glass wrote:
> Hi guys,
> I define a classInstVars: called 'Instances' to keep track of new
> persistent instances in my class FaBackgroundProcess. Of course, I
> implement #new to add those there.
> But I am having a very strange issue now. I have this accessor:
> FaBackgroundProccess class >> instances
> ^ Instances ifNil: [ Instances := OrderedCollection new ]
> If I execute:
> FaBackgroundProcess instances ->>>>>  anOrderedCollection( )
> I get an empty collection (which is what I expect). However, if I inspect
> the class FaBackgroundProcess and see the slot for 'Instances' I see lots
> of instances of FaBackgroundProcess! (when I expect to see same as the
> answer of #instances, that is, empty) And those instances are really alive
> as they prevent GC of other objects.
> So...what is going on????  I attach an screenshot with all the pieces. Any
> help is really welcome since I am lost.
> Thanks in advance,
> --
> Mariano
> http://marianopeck.wordpress.com
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