> I think the current bug is that constraints aren't checked for default
 > values, and also are not checked upon instance creation. That is the
 > real bug. In the above, you are creating an Entity, whereas you really
 > should be creating a CompositeBuilder, set the properties using
 > stateOfComposite() and only then call newInstance(). This way the
 > constraints will be properly checked.

So the correct way should be (?):

     UnitOfWork uow = uowf.newUnitOfWork();
     CompositeBuilder<Book> cb = uow.newEntityBuilder(Book.class);
     cb.stateOfComposite().title().set("Qi4j in Action");

     Book book = cb.newInstance();
     uow.complete();

But that still works (I expected newInstance() to throw a 
ConstraintViolationException), or was that the "current bug" you 
referred to? Or is the code still missing something?

Georg

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