Hi,
I am currently trying to do the following in Cayenne 3.0.2:
* fetch an object A
* delete some related objects which are related to A in an n:m relation
* add new objects to A (same n:m relation)
I have undergone a couple of java.util.ConcurrentModificationException
and org.apache.cayenne.validation.ValidationException exception without
being able to fix them. Here is some code, but a general hint on how to
achieve that (especially when to do commits) would be much appreciated.
* Class Forecast
* Class LineItem
* Class ForecastCondendingLineItem (n:m relation between Forecast and
LineItem)
I have an object F of class Forecast which I have pulled from the
database. Now I try to delete the n:m relations like this:
for(ForecastContendingLineItem temp :
F.getForecastContendingLineItemArray()) {
F.removeFromForecastContendingLineItemArray(temp);
context.deleteObject(temp);
}
This results in the ConcurrentModificationException. I also tried this:
context.deleteObjects(F.getForecastContendingLineItemArray());
There is no exception, but I do not see any DELETE statements in the log
either (probably I shoudn't!?). Then later on I try to add new n:m
relations like this:
relation =
config.context().newObject(ForecastContendingLineItem.class);
relation.setToForecast(_forecastItem);
relation.setToLineItem(contendingLineItem);
relation.setUsedImpressions(0L);
relation.setOsi(0L);
But this results in the following a ""Validation failure for
ch.goldbach.lib.ForecastContendingLineItem.toForecast: "toForecast" is
required."" exception although my feeling is that I do set the
ToForecast relation through "setToForecast", no?
Anyone can help me out?
Thanks,
Tobias.
