PersistentDefect is the foundation of the BugTracker application, and is the
class of object that is "remoted" through CORBA to the bugtracker client and
servlet.
when the defect has changed, the policy object will notify the list of addressees (in the changedMailList member of the defect) that the defect has changed, and include the updated defect.
The TestHarness class is a very simple module that loads a class under
test that has implemented the Testable interface, and exercises it by
calling its TestUnit method.