Broadleaf’s Extensibility Concepts illustrates how you can easily create a new custom entity where Broadleaf will auto-generate several components for you - such as an endpoint, projection, repository, etc…
Question - How to Debug Auto-Generated Endpoint?
Broadleaf dynamically creates “Interceptor” classes via the following component: com.broadleafcommerce.data.tracking.core.TrackableFlowComponentFactory
You can put a breakpoint in any of the Interceptor Classes defined in this component, for example: TrackableFlowComponentFactory.CreateInterceptor#delegate
With that said, these are rather uninteresting classes and mainly function as bridge code into BaseRsqlCrudEntityService and setting a breakpoint here may also prove to be useful for debugging purposes.