On Mon, Jul 1, 2019 at 7:44 AM Matthieu Ghilain <[email protected]> wrote:
>
> Is it possible for jackson to deserialize an unknown payload based on some
> type mapping information provided via a field which is present in all the
> payloads?
>
> Constraint: the payload should not have any parent class/interface.
>
> I'd like to just do mapper.read(bytes, Object.class) and have jackson
> deserialize it to the right class based on a common property (like
> messageType).
>
> Thx a lot for your help!
Yes, sort of: for structures like:
{ "messageType" : "typeIdentifier",
"value" : { .... }
}
and result of, say
public class Wrapper {
@JsonTypeInfo(use = Id.CLASS, // or possibly NAME but then need to
map them explicitly
property = "value"
include = As.EXTERNAL_PROPERTY
)
public value Object;
}
it is possible.
Alternatively use of so-called "default typing" can achieve it too,
but it can lead to security concerns (see
https://medium.com/@cowtowncoder/on-jackson-cves-dont-panic-here-is-what-you-need-to-know-54cd0d6e8062).
But what that does (via `ObjectMapper.enableDefaultTyping(...)`) is
equivalent to enabled `@JsonTypeInfo` on categories of types (classes)
without having to add actual annotation.
-+ Tatu +-
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