@JsonProperty annotation ignored

I have the following code. It is in Kotlin, which may be relevant, but I don’t think so:

class WordCounts private @JsonCreator constructor(
        @JsonProperty("sourceToken") val sourceToken: ValueToken<List<String>>,
        @JsonProperty("resultId") resultId: ValueIdGroup<Int>,
        @JsonProperty("wordMap") val wordMap: MutableMap<String, Int>) : LearningTransform {
    // bunch more code here that's not relevant
}

And I have a serialized object that looks like this:

{"sourceToken":{"id":{"name":"words","clazz":"java.util.List"}},"resultId":{"prefix":"wordCounts","clazz":"java.lang.Integer"},"wordMap":{"foo":0,"bar":1,"baz":2}}

When I try to deserialize it I get:

 com.fasterxml.jackson.databind.JsonMappingException: Argument #1 of constructor [constructor for com.analyticspot.ml.framework.testutils.WordCounts, annotations: {interface com.fasterxml.jackson.annotation.JsonCreator=@com.fasterxml.jackson.annotation.JsonCreator(mode=DEFAULT)}] has no property name annotation; must have name when multiple-parameter constructor annotated as Creator
     at [Source: {"sourceToken":{"id":{"name":"words","clazz":"java.util.List"}},"resultId":{"prefix":"wordCounts","clazz":"java.lang.Integer"},"wordMap":{"foo":0,"bar":1,"baz":2}}; line: 1, column: 1]
        at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:305)
        at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCache2(DeserializerCache.java:268)
        at com.fasterxml.jackson.databind.deser.DeserializerCache._createAndCacheValueDeserializer(DeserializerCache.java:244)
        at com.fasterxml.jackson.databind.deser.DeserializerCache.findValueDeserializer(DeserializerCache.java:142)
        at com.fasterxml.jackson.databind.DeserializationContext.findRootValueDeserializer(DeserializationContext.java:476)
        at com.fasterxml.jackson.databind.ObjectMapper._findRootDeserializer(ObjectMapper.java:3899)
        at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3794)
        at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2842)
        at com.analyticspot.ml.framework.serialization.GraphSerDeserTest.testTokenGroupsSerialize(GraphSerDeserTest.kt:166)

Which seems odd since there is a @JsonProperty annotation on all the values.

Note that ValueIdGroup serializes and deserializes fine by itself (I have unit tests for that).

I also tried adding a static factory method annotated with @JsonCreate and the @JsonProperty annotations:

class WordCounts private constructor(
        val sourceToken: ValueToken<List<String>>,
        resultId: ValueIdGroup<Int>,
       val wordMap: MutableMap<String, Int>) : LearningTransform {

    companion object {
        private val log = LoggerFactory.getLogger(WordCounts::class.java)

       @JvmStatic @JsonCreator
        fun createFromSerialized(
                @JsonProperty("sourceToken") sourceToken: ValueToken<List<String>>,
                @JsonProperty("resultId") resultId: ValueIdGroup<Int>,
                @JsonProperty("wordMap") wordMap: MutableMap<String, Int>): WordCounts {
            return WordCounts(sourceToken, resultId, wordMap)
        }
    }

   // other irrelevant code
}

but the result is the same. In desperation I also tried rewriting ValueIdGroup a few ways thinking maybe that was somehow confusing it and the error message was just wrong but that didn’t help either.

I’ve reproduced this with Jackson 2.7.0, 2.7.4, and 2.8.4 with and without com.fasterxml.jackson.module:jackson-module-kotlin:2.8.4

Am very stuck. Any help would be much appreciated.

[fruedaCode]

It works if I use @field:JsonProperty like this:

data class DataView(val id: String,
                    @field:JsonProperty("dayOfMonth") val monthDay: MonthDay)

data class MonthDay(val day: Int, @field:JsonProperty("asfasdf") val isSunny: Boolean)

[BartoszKaszewczuk]

I also observed the same behaviour but I’m almost certain the issue is with Kotlin’s data class.

I had properties starting with is eg isAlive and the prefix is would always be trimmed during marshalling resulting in JSON property named alive and the discrepancy in field names would then of course make Jackson fail during unmarshalling. @JsonProperty("isAlive") seemed to have no effect but @field:JsonProperty("isAlive") like @fruedaCode suggested did work.