hardening(validation): enforce Bean Validation and stabilize 400 contract#42
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hardening(validation): enforce Bean Validation and stabilize 400 contract#42
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…egalArgumentException to 400, update tests
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Summary
This PR stabilizes the API input contract by:
@Validon request-body controller methodsIllegalArgumentExceptionto HTTP 400Invalid input now consistently returns 400 Bad Request instead of 500.
No architectural or business logic changes were introduced.
Type of change
Validation
Commands run:
Docs impact
Security impact
This change improves API robustness by preventing invalid payloads from propagating into deeper layers and causing unintended 500 responses.
No changes were made to authentication, authorization, or cryptographic configuration.