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Date: Thu, 07 Jan 2010 23:06:08 +0100
From: =?UTF-8?B?TWFyZWsgxaBhYm8=?= <msabo@buk.cvut.cz>
Organization: Club SU CVUT Buben
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To: user@cayenne.apache.org
Subject: Re: DataObject expiring?
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Well, no luck so far, I didn't manage to reproduce this so I'm not sure 
if I should open a bug. Maybe if the issue will rise again sometime in 
the future.

Marek

Marek Šabo wrote:
> I will try to reproduce it and open detailed issue.
>
> Regards,
>
> Marek
>
>
> Bryan Lewis wrote:
>> Marek, would you like the honor of opening the Jira?  Your stack 
>> trace will
>> be more useful than my story.
>>
>>
>> On Wed, Jan 6, 2010 at 5:25 AM, Andrus Adamchik 
>> <andrus@objectstyle.org>wrote:
>>
>>  
>>> Would you mind opening a Jira with these details and include the JVM
>>> version and maybe the CPU type on your server?
>>>
>>> Weak references in Cayenne 3.0 are at the ObjectStore level and 
>>> should not
>>> affect relationships, if Java works correctly. I.e. related objects are
>>> store via hard references.
>>>
>>> Andrus
>>>
>>>
>>>
>>>
>>> On Jan 6, 2010, at 4:45 AM, Bryan Lewis wrote:
>>>
>>>  This rings a bit of a bell with me.  We made our first big release 
>>> with
>>>    
>>>> Cayenne 3.0 a couple of weeks ago (it went well, thank you) and saw a
>>>> similar-sounding problem.  It happened only intermittently and only 
>>>> on our
>>>> production server.  We could never reproduce it on our test server, 
>>>> let
>>>> alone in a debugger.
>>>>
>>>> We had an object stored in the session.  Our editor-page 
>>>> initialization
>>>> code
>>>> got the object and then the value of its to-one relationship.  This
>>>> related
>>>> object would occasionally be null.
>>>>
>>>>  StoryDetail object from session  ---to-one--->  Story   (occasionally
>>>> null)
>>>>
>>>> We couldn't pin down how to reproduce it.  (The user it kept 
>>>> happening too
>>>> works very remotely.)  My guess was some kind of garbage 
>>>> collection.  The
>>>> user would enter a lot of text for several minutes and then 
>>>> save/refresh
>>>> the
>>>> page and get the NPE.  The other hint was that the same code had 
>>>> never had
>>>> a
>>>> problem in two years with Cayenne 2.  On the other hand, I was 
>>>> unable to
>>>> reproduce it by adding explicit garbage collection calls so my 
>>>> guess could
>>>> be off base.
>>>>
>>>> I worked around it by refetching the list of StoryDetails, with a 
>>>> prefetch
>>>> on Story, so that the desired Story object would always be freshly
>>>> fetched.
>>>>
>>>>
>>>>
>>>> On Tue, Jan 5, 2010 at 3:31 PM, Andrus Adamchik 
>>>> <andrus@objectstyle.org
>>>>      
>>>>> wrote:
>>>>>         
>>>>  On the surface looks like some (de)serialization issue. Although that
>>>>      
>>>>> doesn't make much sense, as RelationshipFault.relationshipOwner is 
>>>>> not
>>>>> transient and can't be reset to null easily. The best bet is to 
>>>>> run this
>>>>> in
>>>>> debugger to get a better picture of what's going on with your 
>>>>> objects.
>>>>>
>>>>> Andrus
>>>>>
>>>>>
>>>>> On Jan 5, 2010, at 10:13 PM, Marek Šabo wrote:
>>>>>
>>>>>  Hi all,
>>>>>        
>>>>>> is there any way that a dataobject could expire? I mean i'm storing
>>>>>> user's
>>>>>> settings dataobject in session and after a while, say max 5 min. 
>>>>>> when I
>>>>>> try
>>>>>> to submit a form that binds this data as foreign key I got a 
>>>>>> nullpointer
>>>>>> exception from setting up that relationship. I think it does't 
>>>>>> expire in
>>>>>> session because I'm still logged in and only way is to logout and 
>>>>>> login
>>>>>> back
>>>>>> to have the setting reloaded from database. Appending end of 
>>>>>> stacktrace:
>>>>>>
>>>>>>    at
>>>>>>
>>>>>> org.apache.cayenne.util.RelationshipFault.isTransientParent(RelationshipFault.java:70) 
>>>>>>
>>>>>>    at
>>>>>>
>>>>>> org.apache.cayenne.util.PersistentObjectList.isFault(PersistentObjectList.java:75) 
>>>>>>
>>>>>>    at
>>>>>>
>>>>>> org.apache.cayenne.util.PersistentObjectList.add(PersistentObjectList.java:125) 
>>>>>>
>>>>>>    at
>>>>>>
>>>>>> org.apache.cayenne.CayenneDataObject.addToManyTarget(CayenneDataObject.java:282) 
>>>>>>
>>>>>>    at
>>>>>>
>>>>>> org.apache.cayenne.CayenneDataObject.setReverseRelationship(CayenneDataObject.java:364) 
>>>>>>
>>>>>>    at
>>>>>>
>>>>>> org.apache.cayenne.CayenneDataObject.setToOneTarget(CayenneDataObject.java:315) 
>>>>>>
>>>>>>
>>>>>> Thanks for any ideas,
>>>>>>
>>>>>> Regards
>>>>>>
>>>>>> -- 
>>>>>> Marek Šabo
>>>>>>
>>>>>>
>>>>>>           
>>>>>         
>>
>>   
>


-- 
Marek Šabo
Server Manager
Club SU CVUT Buben
Bubenečská Kolej (421)
XMPP: zeratul021@gmail.com