In some organizations, the errors that happen in some systems might be relevant to other systems (for example, our production support case management system in the Exception Handler sample that we showed earlier in the chapter). Thanks to the ESB Exceptions service, we can standardize our operations processes in a company-wide fashion by having a unified process to notify and react to issues that happen in our systems.
External systems can use this web service to submit their own errors to the ESB. They just need to invoke the web service providing the relevant information of the fault that happened in the system, and so the fault message will be published into the ESB, allowing any subscribers to receive it and process it as required.
The service is deployed in two flavors when the ESB Toolkit is installed, providing both SOAP and WCF endpoints. The following figure shows the two types of services:
