Worked on hardening the SecurableObject PO conversion path in the apache/gravitino repository by introducing robust input validation and targeted unit testing. Addressed a bug in POConverters.fromSecurableObjectPO by implementing non-null and length checks for privilegeNames and privilegeConditions, ensuring that mismatched or null arrays trigger clear, actionable IllegalArgumentExceptions rather than cryptic runtime errors. Added a dedicated unit test to verify this behavior and prevent future regressions. Leveraged Java for both the implementation and testing, with a focus on error handling and defensive programming. These changes improved the reliability and maintainability of the privilege conversion flow for downstream consumers.