Support naive deserialization of `Serializable` values as "untyped", same as `java.lang.Object`

[chrylis]

Currently, Jackson is willing to deserialize JSON into a target of type Object as simple Java types--String, Integer, Map, and such. This means that I can successfully deserialize a target property of

Map<String, ? extends Object> miscProperties;

with the results being objects of basic types. So far so good.

However, if I instead I use Serializable as the generic bound, Jackson complains that

Can not construct instance of java.io.Serializable: abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information

While in the case of general type resolution I understand the rationale for what's going on here, in practice every single type that Jackson will produce when faced with a deserialization into Object is Serializable, and it should treat a target of Serializable identically to a target of Object.

I am using 2.8.11.2.

[cowtowncoder]

Interesting. I'll have to think about this a bit -- I am bit hesitant here since use of Serializable as target type to me does suggest to me possible other interpretation than Object.
But then again, as things are, this case is not supported at all (except if there is custom deserializer registered).

[hubena]

How to deserialize the generics of the Serializable interface, using Object or using the default deserializer?

[cowtowncoder]

@hubena I am not sure I fully understand the question.

@chrylis I think I agree with you, in that coercion here makes sense. So I will proceed with the plan.