On Jan 11, 2010, at 1:03 PM, Chuck Hill wrote:
Hi Gennady,
On Jan 11, 2010, at 4:26 AM, Gennady Kushnir wrote:
Hello again.
I've got it that I was doing something wrong. I've found and removed
several commandments violations, employed MultiECLockManager for
properly locking everything... but I am still getting these errors!
How could I track where is that violation hidden within over 5000
rows of code?
There are many, many ways in which things can be done wrong. I
don't know of any easy way to find the source. If you can isolate
and reproduce the problem in a minimum set of steps, that will
reduce the amount of code you have to look at.
These errors raise without any visible dependencies.
Users report that even when system says that it could not save
something (because of that strange error), actually data is saved and
can be reviewed after logging out and in again.
Something else is happening in your code then. Perhaps this is not
from a save? Nothing should get written to the database if this
happens during a saveChanges. Maybe this is happening in your app
just after saveChanges()?
Hmmm ....... half-saving transactions is a common problem when you
don't use a transactional database and no "transaction rollback" is
available when ec fails during a save. What database engine are you
using?
I tried to find the source of error adding logging to awakeFromFetch
when snapshot is uninitialized. But this log has never fired yet
whereas I have already seen errors related to empty snapshot of
object
of that class...
I am confused now...
Not sure what is happening there.
Chuck
2009/11/3 Chuck Hill <ch...@global-village.net>:
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
--
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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