This documentation is for WSO2 Enterprise Integrator version 6.1.1 . View documentation for the latest release.

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You can use the Class mediator and custom mediators for user-specific custom developments when there is no built-in mediator that already provides the required functionality. However, class and custom mediators incur a high maintenance overhead. Custom mediators in particular might introduce version migration complications when upgrading WSO2 EI. Therefore, avoid using them unless  the scenario is frequently re-used and heavily user-specific. For best results, use WSO2 Developer Studio for debugging Enterprise Integrator to debug Class and custom mediators.