Worked on the apache/bookkeeper repository to modernize its testing infrastructure and maintain license compliance. Focused on migrating the DefaultEntryLogTest suite from JUnit 4 to JUnit 5, updating imports, annotations, and assertions to align with current testing standards. This refactoring improved test reliability and enhanced feedback from continuous integration pipelines. Additionally, refreshed the NOTICE file to reflect the 2025 copyright year, ensuring ongoing legal compliance for the project. The work leveraged Java and unit testing expertise, emphasizing maintainability and adherence to best practices. No bugs were fixed during this period, with efforts concentrated on foundational maintenance and test modernization.