Remove @JsonCreator annotation from Kotlin types#917
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…ion from Jackson 2.21+
jiholee17
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asibross,
iparadiso,
iuliiasobolevska,
jjacobs44,
kilink,
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srinivasankavitha
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sjohnr
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Jan 27, 2026
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Jackson 2.21 introduced stricter detection for constructors and now flags the generated Kotlin 0-arg constructor as being annotated with
@JsonCreatorin addition to the constructor defined in the data class, leading to aConflicting property-based creatorsJsonMappingExceptionwhen the object mapper is used at runtime.This PR removes the
@JsonCreatorannotation entirely from generated Kotlin data classes.@JsonPropertyis kept for each field to maintain the mapping from JSON field to parameters. With this change, Jackson uses the explicitly defined non-0-arg constructor as the creator and avoids the conflicting creators exception.