enkilee opened a new pull request, #2837:
URL: https://github.com/apache/rocketmq-dashboard/pull/2837

   
   ## What is the purpose of the change
   
   MybatisPlusAclRepository 的创建逻辑是典型的 check-then-act:先 selectList 查 accessKey 
是否存在,再 insert。数据库有 uk_access_key 唯一索引兜底。
   •问题:并发创建相同 accessKey 时,后插入者抛 DuplicateKeyException,但该 repository 没有捕获(对照 
AuthService、CloudCredentialService、NameserverRegistryService 均有 catch 
(DuplicateKeyExce
   ption) 翻译成 409),GlobalExceptionHandler 也无专门处理器,会落到通用 Exception 处理器 → HTTP 
500 "Internal Server Error",而不是干净的 409。
   
   •触发条件:两个请求同时创建同一 accessKey(或重试/双击提交),竞态窗口真实存在。
   
   •修复建议:参照 
CloudCredentialService.createShouldTranslateConcurrentDuplicateKeyToConflict 
的既有模式,在创建分支捕获 DuplicateKeyException 转为 409。]
   
   ## Brief changelog
   
   XX
   
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