Server-side Exception Handling by Composite Web Services Kung-Kiu Lau and Cuong Tran School of Computer Science, the University of Manchester Manchester M13 9PL, United Kingdom kung-kiu,ctran@cs.man.ac.uk Abstract: Currently exception handling for web service orchestrations is performed on the client side. We have defined composite web services that are not single orchestrations but complete web services that contain all possible orchestrations of their sub-services. Our composite web services can therefore define and perform exception handling just once for all such orchestrations, on the server side. In this paper we explain and discuss our approach to server-side exception handling by composite services.