java spring 事务失效的12种情况

1.访问权限问题

@Service
public class UserService {
    
    @Transactional
    private void add(UserModel userModel) {
         saveData(userModel);
         updateData(userModel);
    }
}

2. 方法用final修饰

@Service
public class UserService {
 
    @Transactional
    public final void add(UserModel userModel){
        saveData(userModel);
        updateData(userModel);
    }
}

3.方法内部调用

有时候我们需要在某个Service类的某个方法中，调用另外一个事务方法，比如：

@Service
public class UserService {
 
    @Autowired
    private UserMapper userMapper;
 
  
    public void add(UserModel userModel) {
        userMapper.insertUser(userModel);
        updateStatus(userModel);
    }
 
    @Transactional
    public void updateStatus(UserModel userModel) {
        doSameThing();
    }
}

 在该Service类中注入自己； 在该Service类中注入自己也是一种选择。具体代码如下：

@Servcie
public class ServiceA {
   @Autowired
   prvate ServiceA serviceA;
 
   public void save(User user) {
         queryData1();
         queryData2();
         serviceA.doSave(user);
   }
 
   @Transactional(rollbackFor=Exception.class)
   public void doSave(User user) {
       addData1();
       updateData2();
    }
 }

4.未被spring管理

没有添加 @Controller、@Service、@Component、@Repository等注解

//@Service
public class UserService {
 
    @Transactional
    public void add(UserModel userModel) {
         saveData(userModel);
         updateData(userModel);
    }    
}

5.多线程调用

两个方法不在同一个线程中，获取到的数据库连接不一样，从而是两个不同的事务

@Slf4j
@Service
public class UserService {
 
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private RoleService roleService;
 
    @Transactional
    public void add(UserModel userModel) throws Exception {
        userMapper.insertUser(userModel);
        new Thread(() -> {
            roleService.doOtherThing();
        }).start();
    }
}
 
@Service
public class RoleService {
 
    @Transactional
    public void doOtherThing() {
        System.out.println("保存role表数据");
    }
}

6.表不支持事务

数据库 存储引擎 不是innodb。

7.未开启事务

8.自己吞了异常

@Slf4j
@Service
public class UserService {
    
    @Transactional
    public void add(UserModel userModel) {
        try {
            saveData(userModel);
            updateData(userModel);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
        }
    }
}

9.手动抛了别的异常

@Slf4j
@Service
public class UserService {
    
    @Transactional
    public void add(UserModel userModel) throws Exception {
        try {
             saveData(userModel);
             updateData(userModel);
        } catch (Exception e) {
            log.error(e.getMessage(), e);
            throw new Exception(e);
        }
    }
}

10.自定义了回滚异常

@Slf4j
@Service
public class UserService {
    
    @Transactional(rollbackFor = BusinessException.class)
    public void add(UserModel userModel) throws Exception {
       saveData(userModel);
       updateData(userModel);
    }
}

11.嵌套事务回滚多了

public class UserService {
 
    @Autowired
    private UserMapper userMapper;
 
    @Autowired
    private RoleService roleService;
 
    @Transactional
    public void add(UserModel userModel) throws Exception {
        userMapper.insertUser(userModel);
        roleService.doOtherThing();
    }
}
 
@Service
public class RoleService {
 
    @Transactional(propagation = Propagation.NESTED)
    public void doOtherThing() {
        System.out.println("保存role表数据");
    }
}