[MS-1293] Refactor feature/clientapi to use Kotlin Serialization instead of Jackson

[meladRaouf]

JIRA ticket
Will be released in: 2026.1.0

Notable changes

• Use kotlin serialization to parse and extract subjectAge metadata param from requests
• Added unit tests

Testing guidance

• Pass metadata to SID and check if it is parsed well

Additional work checklist

• Effect on other features and security has been considered
• Design document marked as "In development" (if applicable)
• External (Gitbook) and internal (Confluence) Documentation is up to date (or ticket created)
• Test cases in Testiny are up to date (or ticket created)
• Other teams notified about the changes (if applicable)

[Copilot]

Pull request overview

This PR refactors the feature/client-api module to use Kotlin Serialization instead of Jackson for JSON processing, as part of a broader effort to migrate away from Jackson throughout the codebase before the 2026.1.0 release.

Changes:

• Replaced Jackson JSON processing with Kotlin Serialization in the client-api feature module
• Updated validateJsonOrThrow to use Kotlin Serialization's parseToJsonElement
• Removed Jackson-specific serialization module setup for TokenizableString (now handled by @Serializable annotations)

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
infra/core/src/main/java/com/simprints/core/tools/json/JsonHelper.kt	Updated validateJsonOrThrow to use Kotlin Serialization instead of Jackson's readTree, with appropriate documentation
feature/client-api/src/main/java/com/simprints/feature/clientapi/usecases/GetEnrolmentCreationEventForRecordUseCase.kt	Removed Jackson imports and custom serialization module; replaced toJson call with json.encodeToString
feature/client-api/src/main/java/com/simprints/feature/clientapi/mappers/request/extractors/ActionRequestExtractor.kt	Refactored getSubjectAge() to use Kotlin Serialization for parsing metadata JSON; removed unused Intent extension
feature/client-api/src/test/java/com/simprints/feature/clientapi/usecases/GetEnrolmentCreationEventForRecordUseCaseTest.kt	Updated test to verify the new encodeToString method call instead of toJson
feature/client-api/src/test/java/com/simprints/feature/clientapi/mappers/request/extractors/ActionRequestExtractorTest.kt	Added comprehensive test coverage for getSubjectAge() with edge cases
feature/client-api/build.gradle.kts	Added Kotlin Serialization plugin and removed Jackson dependency

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud