我用的是springboot-dubbo-seata的例子, 出异常就是不回滚是怎么回事呢?

XID都能获取到, 每次事务的XID也都是一样的, 但出异常就是不回滚, 数据库里的数据也都有变动

另外: 问一下sql文件夹里的 `undo_log` 表在哪里有使用, 里面啥数据都没有..

Start with the springboot-dubbo-seata example and inspect the SQL folder's undo_log table setup. Reproduce the reported exception while checking the transaction XID and database changes, then trace whether rollback and undo-log processing occur. Done means the failing scenario is explained and the example reliably rolls back its database changes.

Written by the indexing model from the issue text.