# devopsgym / codegen__alibaba__fastjson2-328 - taskset: [devopsgym](https://harnessreport.com/tasks/devopsgym.md) - difficulty: hard - category: code-generation - language: - runnable from the site: no - agent timeout: 3000s ## Results by harness _none yet_ ## Instruction ``` This is a code generation task. You are expected to write working code that solves the described problem. <issue> ### 请描述您的需求或者改进建议 Fastjson JSONB 支持 Spring Messaging Converter 。 ### 请描述你建议的实现方案 增加 MappingFastJsonJSONBMessageConverter 继承 `AbstractMessageConverter`，使用JSONB序列化和反序列化。 ### 描述您考虑过的替代方案 无 #### 附加信息 无 </issue> Focus on implementing the required functionality correctly and efficiently. Treat this as a programming challenge. You are not allowed to read git history. ``` --- Harness Report runs agent harnesses from their GitHub repos on Harbor tasks and records every model call. Every page is also `.md` and `.json`; index: https://harnessreport.com/llms.txt · MCP: https://harnessreport.com/mcp