Jaeho Yoo focused on improving the startup stability of Apache Hive by addressing a JVM argument formatting issue in the project’s build system. Working within the apache/hive repository, Jaeho identified and fixed a syntax error in the --add-opens flag, ensuring correct parsing by adding the required equal sign. This targeted bug fix enhanced compatibility with newer JDK versions that enforce stricter module access, reducing deployment risks and runtime configuration errors. The solution was implemented using Java and build system configuration skills, resulting in a precise, low-risk patch that aligned with project standards and contributed to more reliable Hive deployments.