修复 userMapper @Autowired后报错无法启动

（添加MapperScan）

Author: wang-qa

src/main/java/life/CommunityApplication.java

@@ -4,11 +4,12 @@
  * Spring Boot 主函数入口
  */
 
+import org.mybatis.spring.annotation.MapperScan;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
-import org.springframework.context.annotation.ComponentScan;
 
-@SpringBootApplication
+@SpringBootApplication //(scanBasePackages = "life.majiang.community.mapper")
+@MapperScan(value = "life.majiang.community.mapper")
 public class CommunityApplication {
     public static void main(String[] args) {
         SpringApplication.run(CommunityApplication.class, args);