ABC Travel offers a night reservation service, exposed as a web service. XYZ Stays offers a hotel reservation service, also exposed as a web service. ABC and XYZ will not change their web service. A startup company has contacted you for advice about designing a new service that combines flight and hotel reservations, which they will offer as a web service.
The startup company plans to provide their service by implementing a portable Java EE solution that aggregates the two services offered by ABC Travel and XYZ Stays, a combined reservation succeeded.
Only if both the flight reservation and the hotel reservation succeed
Which is the most effective way to meet the business requirement?
A. The startup company should implement their new service as a web service that uses an XA transaction manager.
B. The startup company cannot implement their new service as a web service, but must use an enterprise JavaBean (EJB) component to gain transaction propagation.
C. The startup company should implement their new service as a web service by calling the two existing services, and implementing their own compensating transaction.
D. The startup company can implement their new service as a web service by calling the two existing services in a single transaction, relying on transaction propagation to support this business rule.
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