Worked on the spring-projects/spring-security repository to enhance the reliability of authentication flows by addressing a subtle bug in OAuth2 handling. Focused on implementing correct equals and hashCode methods for the OAuth2AuthorizationRequest class, enabling safe and predictable use of these objects as keys in hash-based collections. Utilized Java best practices, including Objects.equals and Objects.hash, to ensure null-safe comparisons across all relevant fields. This change improved the stability and maintainability of security components, laying the groundwork for robust caching and map-based optimizations. Demonstrated strong skills in Java, OAuth2, object-oriented programming, and unit testing throughout the development process.