On Tue, Aug 20, 2019 at 1:03 PM Erik Ramfelt <[email protected]> wrote:
>
> Hi
>
> If I check the documentation for the keyUsing annotation, it states that it
> is for methods, fields and constructors. [1] But the documentation at github
> states that it is for (method, field). [2]
Perhaps confusion here is between Constructor methods vs Constructor parameters?
`@JsonDeserialize` is NOT allowed on Constructor methods themselves
but only on Constructor parameters. But it definitely is allowed on
latter, and further, property `keyUsing` should apply similar to if it
was used on setter-method or field.
> Is it possible to set @JsonDeserialize(keyUsing =
> classOf[SomeKeyDeserializer]) on a constructor, if so what params would
> constructor take. Is there any documentation on how to use the keyUsing
> annotation on a method or constructor?
It would be used on parameter, like:
public MyType(@JsonDeserialize(keyUsing = MyKeyDeserializer.class
@JsonProperty("data") Map<MyType, String> data) { .... }
>
> Is there a way from a reflect.Method obj (method is annotated with
> JsonDeserialize) to get the deserializers from that method object using
> jackson, without creating the deserializers manually? I would like to be able
> to get the deserializer for a reflected method in order to solve a Map[]
> deserialization problem, where I have annotated a method with the
> JsonDeserialize.keyUsing. Reasons behind are some what difficult to explain.
I am not sure I understand this question.
-+ Tatu +-
>
> Best regards
> //Erik
> 1 -
> https://fasterxml.github.io/jackson-databind/javadoc/2.3.0/com/fasterxml/jackson/databind/annotation/JsonDeserialize.html#keyUsing()
> 2 -
> https://github.com/FasterXML/jackson-databind/wiki/Databind-annotations#user-content-deserialization-reading-json
>
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