Is there any reason why CollectionPropertyHandler.handle(PropertyInfopropertyInfo, TypeInfo propertyType, Object parent, Object child, QName
qName) couldn't call the the getter after setting the field? It appears that we call the getter before the set, but not after.
It is no good to wait until the application calls the getter (since the application may first call PUMD.getPMD() which would return null.
If the convention is to put initialization logic in the getter, perhaps XB should call the getter after setting the field.