This documentation is for WSO2 Enterprise Service Bus version 5.0.0. For the latest ESB, view the latest WSO2 Enterprise Integrator documentation.

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The following best practices are from the following FAQ: If you make changes to the content here, be sure to update it there as well.

Use The Class mediator is a custom Java class, which you need to maintain by yourself. Therefore, it is recommended to use the Class mediator only for not frequently re-used custom developments and very user-specific , custom developments only when scenarios, for which, there is no built-in mediator that already provides the required functionality. Maintaining custom classes incurs a high overhead. Therefore avoid using them unless the scenario is frequently re-used and very user-specific. Your  

Your class mediator might not be picked up and updated, if you use an existing package when creating it.