[PR] UNOMI-952: Return HTTP 400 for malformed Item JSON in REST requests [unomi]

["sergehuber (via GitHub)" <gi...@apache.org>]

sergehuber opened a new pull request, #777:
URL: https://github.com/apache/unomi/pull/777

   ## Summary
   - Harden `ItemDeserializer` to reject non-object or incomplete Item JSON (`itemType` / `itemId` required) with `JsonMappingException` instead of `ClassCastException` / NPE.
   - Map wrapped JSON deserialization failures in `RuntimeExceptionMapper` to HTTP **400** (`badRequest` JSON), completing the UNOMI-928 error-handling work for malformed REST payloads.
   - Add `ItemDeserializerTest` coverage including registered type mappings.
   
   ## JIRA
   - [UNOMI-952](https://issues.apache.org/jira/browse/UNOMI-952) (primary)
   - Related: UNOMI-933, UNOMI-945, UNOMI-928
   
   ## Test plan
   - [x] `mvn -pl persistence-spi test -Dtest=ItemDeserializerTest`
   - [x] `mvn -pl rest test -Dtest=RestExceptionMapperTest,LogSanitizerTest`
   - [ ] Manual: POST context/event payload with malformed `source`/`target` Item (e.g. `{}`, string) → HTTP 400 JSON `{"errorMessage":"badRequest"}`


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Re: [PR] UNOMI-952: Return HTTP 400 for malformed Item JSON in REST requests [unomi]

["sergehuber (via GitHub)" <gi...@apache.org>]

sergehuber merged PR #777:
URL: https://github.com/apache/unomi/pull/777


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