Contributed to the OpenLiberty/open-liberty repository by enhancing test coverage and improving test suite stability for Jakarta Persistence features. Focused on expanding and validating the Criteria API concat() function, introducing targeted tests and a domain entity to ensure Jakarta Persistence 3.2 compliance. Applied Java and SQL expertise to streamline JakartaPersistenceServlet tests, removing outdated log descriptions and SQL statements while implementing conditional logic to handle SQLServer-specific limitations. Prioritized quality assurance and cross-database reliability, resulting in reduced CI noise and faster feedback cycles. The work emphasized robust unit testing and maintenance, supporting more reliable releases and minimizing risk during API changes.