A knowledge-based approach for handling exceptions in business processes
Information Technology and Management
Understanding SOA with Web Services (Independent Technology Guides)
Understanding SOA with Web Services (Independent Technology Guides)
Information Technology and Management
Using WS-BPEL to Implement Software Fault Tolerance for Web Services
EUROMICRO '06 Proceedings of the 32nd EUROMICRO Conference on Software Engineering and Advanced Applications
Web services and business process management
IBM Systems Journal
AMT '09 Proceedings of the 5th International Conference on Active Media Technology
Making business processes adaptive through semantically enhanced workflow descriptions
Proceedings of the 6th International Conference on Semantic Systems
Context aware exception handling in business process execution language
Information and Software Technology
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WS-BPEL is widely used nowadays for specifying and executing composite business processes within the Service Oriented Architecture (SOA). During the execution however, of such business processes, a number of faults stemming from the nature of SOA (e.g. network or server failures) may occur. The WS-BPEL scenario designer must therefore use the provisions offered by WS-BPEL to catch these exceptions and resolve them, usually by invoking some equivalent web service that is expected to be reachable and available. System fault handler specification is though an additional task for the WS scenario designer, while the presence of such handlers within the scenario necessitates extra maintenance activities, as new alternate services emerge or some of the specified ones are withdrawn. In this paper, we propose a middleware-based framework for system exception resolution, which undertakes the tasks of failure interception, discovery of alternate services and their invocation. The middleware is deployed and maintained independently of the WS-BPEL scenarios, removing thus the need for specifying and maintaining system fault handlers within the scenarios. We also present performance measures, establishing that the overhead imposed by the addition of the proposed middleware layer is minimal.