1. A computer-implemented method of an application integration system comprising: identifying, by operation of an application integration system, an exception corresponding to an integration operation of an integration process; determining, by operation of the application integration system, a type of the exception; determining, by operation of the application integration system, one or more exception handling patterns for the type of the exception, wherein a failover router process is used to react on non-callable exception handling patterns within a sequence of integration patterns by calling alternative integration pattern channels without requiring external configuration messages, and wherein the alternative integration pattern channels are modeled explicitly; and configuring, by operation of the application integration system, an exception flow of the integration process based on the one or more exception handling patterns.