Chungmin Lee focused on improving stability and resource management in the apache/incubator-gluten repository by addressing a critical memory leak in the JNI-based Protobuf integration. Using C++ and JNI, Chungmin implemented a targeted fix that introduced a proper cleanup path during JNI unloading, ensuring the Protobuf library released resources correctly when Java native interfaces were unloaded. This work reduced the risk of memory leaks in long-running JVM processes and improved reliability without altering existing interfaces. The solution demonstrated depth in memory management and careful engineering, as it enhanced build and test predictability while maintaining a minimal and low-risk change footprint.