Worked on the apache/flink repository to address a critical issue in catalog lifecycle management by implementing a fix in the CatalogManager. The solution ensured that catalog instances are properly initialized and opened before their definitions are persisted, preventing incomplete catalog states and runtime misconfigurations. Validation logic was added to enforce that every catalog has a specified type, with new tests verifying that missing types raise a ValidationException. This work, focused on backend and API development using Java, improved the reliability of catalog management and enhanced test coverage for catalog initialization, aligning with the requirements outlined in FLINK-37093.