deserialized JsonAnySetter field is null

[MaximValeev]

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• I searched in the issues and found nothing similar.

Describe the bug

I have kotlin data class

data class Request(
    @JsonProperty("header")
    override val header: String? = null,
    @JsonIgnore
    @JsonAnySetter
    @JsonAnyGetter
    val additionProperties: Map<String, Any?>? = null,
) : Parent(header)

and json

      {
            "payloadType": "perform",
            "data":{
              "header": "lol",
              "type": "sometype",
              "any_other_data": {
                  "field1": "1",
                  "field2": "",
                  "field3": "",
                  "field4": {
                      "field5": "",
                      "field6": "",
                      "field7": "anytext"
                  }
              }
            }
        }

Before jackson 2.17.0 the json deserialized into class correctly. any_other_data put to additionalProperties map.
On 2.17.0 version i have additionalProperties == null after the deserialization.

Version Information

2.17.0

Expected behavior

i expected that field annotated with @JsonAnySetter will be filled with all the undeclared fields

[JooHyukKim]

Since additionalProperties has default value of null, we can say either...

• field is deserialized to null
• field is not deserialized, so deafult to null

Could you provide Java-only reproduction to make sure it is jackson-databind issue, @MaximValeev ?
There is separate kotlin repo FYI.

[cowtowncoder]

Right; either this needs to move to jackson-module-kotlin (I can transfer if so), or reproduction should be in Java.

But I think there is probably already an issue wrt @JsonAnySetter not working with Creator properties -- and even PR to potentially fix that.

[kotcrab]

I also ran into this issue, it can be fixed by writing @field:JsonAnySetter. In 2.17.0 ElementType.PARAMETER was added to the @Target list of JsonAnySetter, this causes Kotlin to add this annotation to the constructor parameter instead of the field as described here if you don't specify explicit use-site target.

[JooHyukKim]

Ah, thank u for sharing @kotcrab !

[JooHyukKim]

Some background.

As @kotcrab described above, this is regression caused by annotations module change, the annotation change was meant to be pre-requisite for the databind-module's Allow 'JsonAnySetter' to flow through JsonCreator #562 issue.

I started writing PR #4366 to support the databind-module change, but stopped to allow room for Property Introspection Rewrite in #4515.

As per solution, either....

• revert adding ElementType.PARAMETER to JsonAnySetter or...
• ask @k163377 if it's possible to make changes so that Kotlin module can discover @JsonAnySetter without @field: declaration. Or maybe @cowtowncoder knows the proper extension point for JsonAnySetter discovery?