During March 2026, Cetf focused on backend development within the spring-projects/spring-framework repository, addressing a stability issue in the logging subsystem. Cetf identified and corrected a mismatch in format string argument counts within a core Java logging statement, a change that prevents potential runtime errors and ensures reliable log output. By refining the logging logic, Cetf improved the maintainability and robustness of the system’s logging infrastructure. The work required a detailed understanding of Java and logging best practices, demonstrating careful attention to runtime behavior and error prevention. This contribution reflects targeted, in-depth engineering to enhance system reliability and developer experience.