code: private void addCalendarException(MpxjTreeNode parentNode, final ProjectCalendarException exception)
     {
        MpxjTreeNode exceptionNode = new MpxjTreeNode(exception, CALENDAR_EXCEPTION_EXCLUDED_METHODS)
        {
           @Override public String toString()
           {
              return m_dateFormat.format(exception.getFromDate());
           }
        };
        parentNode.add(exceptionNode);
        addHours(exceptionNode, exception);
     }
docs: Add an exception to a calendar.
  
  @param parentNode parent node
  @param exception calendar exceptions