How to create different single occurrence from Ms Exchange 2010's recurring appointment

[Wai]

Hi Sir,
I am working on a application which is synchronizing the Calendar
from MsExchange 2010 Server to Google Calendar by adopting google java
api. On ExchangeService , I can identify the appointment type whether
it is RecurringMaster or Event, if it is RecurringMaster, I will
extend it into a occurrence series, but when I want to create
CalendarEventEntry one by one according to those series, the created
CalendarEventEntry are having the same event ID for Google Calendar ,
How can I convert those series into different single event for Google
Calendar? Or is that any way for me to convert those series into
recurrence event of Google?

Regards,
Wai