Re: Objects don't get initialized sometimes
Re: Objects don't get initialized sometimes
- Subject: Re: Objects don't get initialized sometimes
- From: Chuck Hill <email@hidden>
- Date: Tue, 3 Nov 2009 12:21:41 -0800
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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