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Diagnose and design JSON serialization and deserialization behavior for Kotlin plus Jackson in Spring applications. Use when DTOs fail to deserialize, default parameters or nullability behave unexpectedly, date-time or enum formats drift, polymorphic payloads are involved, PATCH semantics must distinguish null from absent, or ObjectMapper changes risk breaking existing API or message contracts.
Source mapping: Tier 2 high-value skill derived from Kotlin_Spring_Developer_Pipeline.md (SK-08).
Make Kotlin plus Jackson behavior explicit, compatible, and testable. Treat wire-format correctness as a contract problem, not only a mapper-configuration problem.
ObjectMapper customizers, Spring Boot Jackson properties, and any per-client mapper overrides.jackson-module-kotlinJavaTimeModulenullnpx skills add JetBrains/skills --skill jackson-kotlin-serialization-specialistHow clear and easy to understand the SKILL.md instructions are, rated from 1 to 5.
Clear and well structured, with only minor parts that might need a second read.
How directly an agent can act on the SKILL.md instructions, rated from 1 to 5.
Mostly actionable with clear steps; only a few small gaps remain.