Question

当我尝试根据 this 和 this 教程运行代码时，发生错误：< / p>

Field userRepository in hello.MainController required a bean of type 'hello.UserRepository' that could not be found.

申请代码：

@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

控制器代码：

    @RestController
    public class MainController {
        @Autowired
        private UserRepository userRepository;

        @RequestMapping("/greeting")
        public HttpEntity<Greeting> greeting(
                @RequestParam(value = "name", required = false, defaultValue = "World") String name) {

            Greeting greeting = new Greeting("...");
            greeting.add(linkTo(methodOn(MainController.class).greeting(name)).withSelfRel());

            return new ResponseEntity<Greeting>(greeting, HttpStatus.OK);
        }

    }

存储库代码：

public interface UserRepository extends JpaRepository<User, Long> {
    User findAny();
}

没有发生其他错误。我无法理解原因。

之前，在另一个项目中，简单的代码提供了奇怪的错误： call 'refresh' before multicasting events via the context: org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@32eff876: startup date [Sun Oct 01 23:41:33 MSK 2017]; root of context hierarchy

Answer 1

在界面上使用@Repository注释。

@Repository
public interface UserRepository extends JpaRepository<User, Long> {
    User findAny();
}

另一个选择是包扫描@EnableJpaRepositories

@EnableJpaRepositories(basePackageClasses=UserRepository.class)
@SpringBootApplication
public class Application {
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

Answer 2

我失踪了＆＃34; boot＆＃34; pom.xml中的一个依赖项中的关键字。

@Autowired并不适用于标准App中的JpaRepository

2 个答案: