This one is more of a feature request than a bug.

The preProcessKeyEvent() and postProcessKeyEvent() methods should be methods 
that subclasses of Container can override.  Currently if a container wants all 
its children's keypresses (and this is a very common occurance) it must 
register as KeyListeners on them all.  A very time consuming action, 
especially since the methods are already existing to handle this correctly 
but just with the wrong visibility.