Worked on the alibaba/fastjson2 repository to address a memory management issue affecting serialization stability. Focused on fixing metaspace memory growth by introducing a writer cache within ObjectWriterProvider, enabling the reuse of object writers and reducing redundant writer creation. This approach improved memory usage and contributed to more predictable performance under load. The solution was validated through the addition of testWriterProxy and comprehensive unit tests to ensure the effectiveness of the fix. Leveraged Java development skills with an emphasis on performance optimization and unit testing, delivering a targeted bug fix that enhanced the reliability of the serialization path in production environments.