With the upgrade to Spring Data 2020.0.0 snapshots, org.springframework.data.rest.webmvc.support.DelegatingHandlerMapping is deprecated. The deprecation indicates we should look for Iterable<HandlerMapping>.
Unfortunatley, DispatcherServletsMappingDescriptionProvider uses a Class to identify the source of interest so we'd have to either look for Iterable and check the underlying type or get back to a concrete type for this, which would require some adaptation in Spring Data rest potentially.
/cc @odrotbohm
Comment From: odrotbohm
I might be missing context but couldn't you refactor what's now DelegatingHandlerMappingDescriptionProvider to take a class from the outside? The set up code would then create an instance of that if it detects the original type to implement Iterable<HandlerMapping> (ResolvableType helps here) and if so, initialize that description provider with the wrapping mapping's type (which would be DelegatingHandlerMapping transparently) and the downstream descriptors obtained by iterating over the original mapping?