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
>> <andru..bjectstyle.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
>>>> <andru..bjectstyle.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: zeratul02..mail.com
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