点击启动APP，报错No active profile set, falling back to default profiles: default；

APP类的代码如下：

/**
 * Hello world!
 *
 */
@SpringBootApplication(scanBasePackages  = {"com.miaoshaproject"})
@RestController
@MapperScan("com.miaoshaproject.dao")
//@EnableAutoConfiguration
public class App 
{
    @Autowired
    private UserDoMapper userDoMapper;

    @RequestMapping("/")
    public String home(){
        UserDo userDo = userDoMapper.selectByPrimaryKey(1);
        if(userDo == null){
            return  "用户对象不存在";
        }else {
            return userDo.getName();
        }
    }

    public static void main( String[] args )
    {
        System.out.println( "Hello World!" );
        SpringApplication.run(App.class,args);
    }
}