Can not find a (Map) Key deserializer for type

[yulu-deer]

when i use jackson:2.10.1,
I want to serialize an object, This object contains a Map attribute, the key of this Map is my customized object.
When I deserialize the result, I will report this error.
Can not find a (Map) Key deserializer for type
I found that when deserializing, if the key of the map is a custom object, this error will be reported, as if the key of the map can only be the base type.
Of course, what I mean by a map needs to be an attribute of an object, because at this point, the key of the map will contain contextual information.