Spring Boot Mybatis @Transactional not working 事务对异常的处理

[Shellbye]

今天做项目的时候发现一个问题，就是我用@Transactional装饰的方法中，当抛出Exception或其子类型的时候，并没有回滚。经过一番调研之后发现是设计如此，@Transactional就是不会针对Exception进行回滚，除非你显示的声明如下

@Service
public class MainService {

    private MyUserMapper myUserMapper;

    @Autowired
    public MainService(MyUserMapper myUserMapper) {
        this.myUserMapper = myUserMapper;
    }

    @Transactional(rollbackFor = Exception.class)
    public void createUser(Long id) throws Exception {
        MyUser myUser = new MyUser();
        myUser.setId(id);
        myUser.setUserName("rollback");
        myUserMapper.createMyUser(myUser);
        throw new Exception("for rollback");
    }

    @Transactional
    public void createUserNotRollback(Long id) throws Exception {
        MyUser myUser = new MyUser();
        myUser.setId(id);
        myUser.setUserName("Not rollback");
        myUserMapper.createMyUser(myUser);
        throw new Exception("for rollback");
    }
}

在上面的代码中，createUser因为添加了rollbackFor = Exception.class会回滚，而下面的createUserNotRollback这不会，官方文档有明确的说明：

In its default configuration, the Spring Framework’s transaction infrastructure code marks a transaction for rollback only in the case of runtime, unchecked exceptions. That is, when the thrown exception is an instance or subclass of RuntimeException. ( Error instances also, by default, result in a rollback). Checked exceptions that are thrown from a transactional method do not result in rollback in the default configuration.

想要针对Checked exceptions也进行回滚的话，就入上面的配置即可。
本文涉及到的代码可以整体在这里查看。

参考

1.https://stackoverflow.com/questions/37310550/spring-transaction-management-not-working-with-spring-boot-mybatis
2.https://docs.spring.io/spring/docs/current/spring-framework-reference/data-access.html#transaction-declarative-rolling-back
3.https://dzone.com/articles/spring-transaction-management
4.http://ignaciosuay.com/why-is-spring-ignoring-transactional/