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?
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. 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... 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(); >> } >> _______________________________________________ >> Do not post admin requests to the list. They will be ignored. >> Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) >> Help/Unsubscribe/Update your Subscription: >> >> http://lists.apple.com/mailman/options/webobjects-dev/chill%40global-village.net >> >> This email sent to ch...@global-village.net > > -- > 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 > > > > > > > > _______________________________________________ Do not post admin requests to the list. They will be ignored. Webobjects-dev mailing list (Webobjects-dev@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/webobjects-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
