Re: Objects don't get initialized sometimes
Re: Objects don't get initialized sometimes
- Subject: Re: Objects don't get initialized sometimes
- From: Gennady Kushnir <email@hidden>
- Date: Tue, 3 Nov 2009 23:41:50 +0300
thank you for hints
2009/11/3 Chuck Hill <email@hidden>:
> Start here:
> http://wiki.objectstyle.org/confluence/display/WO/EOF-Using+EOF-Breaking+EOF
>
> Then
> http://www.google.com/search?q=llegalStateException+rowDiffsForAttributes+snapshot
>
>
> Chuck
>
>
> On Nov 3, 2009, at 2:02 AM, Gennady Kushnir wrote:
>
>> Hello list!
>> I have an occasionally occurring problem which I can not reproduce but
>> regularly meet in usage logs.
>> Editing context fails to save changes and reports:
>>
>> java.lang.IllegalStateException: rowDiffsForAttributes: snapshot in
>> com.webobjects.eoaccess.EODatabaseOperation {_dbSnapshot = {}; ..... }
>> does not contain value for attribute named colorNoWeight with snapshot
>> key: colorNoWeight
>>
>> it also happens for different objects mentioning another attributes,
>> but as I see a common situation is that _dbSnapshot value is empty
>> dictionary so no matter what attribute is mentioned. Why could this
>> happen?
>> Object in question was surely in database, not just created or deleted.
>>
>> Also sometimes I get NullPointerException when accessing attributes
>> described as not null, so it seems like object was not initialized on
>> fetch.
>>
>> May it be because these objects were fetched or created and saved in
>> child editing context and after that used (with
>> EOUtilities.localInstanceOfObject() ) in parent ?
>>
>> Once I got reproducible malfunction working with temporary
>> EOEditingContext.
>> EOUtilities.localInstanceOfObject(ec, this) was returning an objects
>> with all attributes set to null whereas original object was fine and
>> was stored in database even before app launch.
>>
>> try {
>> boolean cache = ec.hasChanges()
>> if(cache) {
>> ec = new EOEditingContext();
>> ec.lock();
>> AutoItog ai =
>> (AutoItog)EOUtilities.localInstanceOfObject(ec, this);
>> course =
>> (EduCourse)EOUtilities.localInstanceOfObject(ec, course);
>> result =
>> calculator().collectRelated(course, ai,
>>
>> !namedFlags().flagForKey("runningTotal"),true);
>> } else {
>> ec.lock();
>> result =
>> calculator().collectRelated(course, this,
>>
>> !namedFlags().flagForKey("runningTotal"),true);
>> }
>> ec.saveChanges();
>> if(cache)
>> result =
>> EOUtilities.localInstancesOfObjects(editingContext(), result);
>> } catch (RuntimeException e) {
>> logger.log(LogLevel.WARNING,"Error
>> collecting related", new
>> Object[] {this,e});
>> } finally {
>> ec.unlock();
>> }
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>
> --
> Chuck Hill Senior Consultant / VP Development
>
> Practical WebObjects - for developers who want to increase their overall
> knowledge of WebObjects or who are trying to solve specific problems.
> http://www.global-village.net/products/practical_webobjects
>
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