Just run main class(TestDeser.java), it will throw:
com.fasterxml.jackson.databind.exc.MismatchedInputException: No _valueDeserializer assigned
If rename Room.something to Room.outer, code will work.
With a quick look in the source code, I found that the hashcode of the field name impacts the deserializers initialization order, then the usage of type inheritance and circular reference will be problematic.