dubbo-lcn-demo:mybatis-demo ／0 后会有一条数据luo ku

服务启动都正常，就是访问 http://127.0.0.1:8080/save 时候报／0的500，然后数据库还插入了mybatis_demo2一条数据。。。请问会是什么原因？

另外，我看这个demo模块里所有的service方法都没加TxTransaction注解，是不需要加吗（加了也没成功）

Start by reproducing the reported 500 response when accessing http://127.0.0.1:8080/save and inspect the demo module's service methods. Trace why a row is inserted into mybatis_demo2 despite the failure, and determine whether those methods require the TxTransaction annotation. Done means the cause and transaction behavior are clearly established.

Written by the indexing model from the issue text.