// AbstractFallbackTransactionAttributeSource.java
protected TransactionAttribute computeTransactionAttribute(Method method, Class<?> targetClass) {
    // Don't allow no-public methods as required.
    if (allowPublicMethodsOnly() && !Modifier.isPublic(method.getModifiers())) {
        return null;
    }
    // ...
}

@Transactional(rollbackFor = RuntimeException.class)

-- 檢查表引擎
SHOW TABLE STATUS WHERE Name = 'your_table_name';

-- 修改表引擎為InnoDB
ALTER TABLE your_table_name ENGINE=InnoDB;

@Service // 正確：添加@Service注解
public class UserService {
    
    @Autowired
    private UserMapper userMapper;
    
    @Transactional
    public void createUser(User user) {
        userMapper.insert(user);
        throw new RuntimeException("測試");
        // 現在事務會正常回滾
    }
}

@Configuration
@ComponentScan("com.example.service") // 確保包路徑正確
public class AppConfig {
    // ...
}

@Configuration
@EnableTransactionManagement
public class MultiDatabaseConfig {
    
    @Bean
    public DataSource primaryDataSource() {
        // 主數據源配置...
        return new HikariDataSource();
    }
    
    @Bean
    public DataSource secondaryDataSource() {
        // 次數據源配置...
        return new HikariDataSource();
    }
    
    @Bean
    public PlatformTransactionManager primaryTransactionManager() {
        return new DataSourceTransactionManager(primaryDataSource());
    }
    
    @Bean
    public PlatformTransactionManager secondaryTransactionManager() {
        return new DataSourceTransactionManager(secondaryDataSource());
    }
}

@Service
public class UserService {
    
    // 指定使用的事務管理器
    @Transactional(transactionManager = "primaryTransactionManager")
    public void createUser(User user) {
        // 使用主數據源的操作
    }
    
    @Transactional(transactionManager = "secondaryTransactionManager")
    public void createUserLog(UserLog log) {
        // 使用次數據源的操作
    }
}