Three-tier architecture and exceptions

Question

It\'s considered good practice to have an exception for each layer of application (i.e. PresentationException, ServiceException, PersistenceE

Answer 1

Yes, you should wrap those exceptions in any case, as your service layer clients would otherwise be forced to also deal with the database layer. This would make things overly complicated. Note that the bit of work required to be done in the service layer is meaningless small when compared to the work that would be required to deal with database exceptions in the layer above the service layer.