Question

我有spring-boot-starter-data-jpa和spring-boot-starter-web。我尝试使用List<Project>从mysql加载Spring jpa，但在控制器中看到BeanCreationException。

org.springframework.beans.factory.BeanCreationException：使用名称＆＃39; controller＆＃39;创建bean时出错：注册自动连接的依赖项失败;嵌套异常是org.springframework.beans.factory.BeanCreationException：无法自动装配字段：private com.project.data.spring_jpa.ProjectRepository com.project.application.Controller.repository;嵌套异常是org.springframework.beans.factory.NoSuchBeanDefinitionException：找不到类型为[com.project.data.spring_jpa.ProjectRepository]的限定bean依赖：预期至少有1个bean可以作为此依赖项的autowire候选者。依赖注释：{@ org.springframework.beans.factory.annotation.Autowired（required = true）}

Controller.java：

...
@RestController
public class Controller {

    ...

    @Autowired 
    private ProjectRepository repository;


    private ProjectAccessor projectAccessor = manager.createAccessor(ProjectAccessor.class);

    public void setRepository(ProjectRepository repository){
        this.repository = repository;
    }

    @RequestMapping("/test")
    @ResponseBody
    public List<Project> test() {


        System.out.println("mysql test");

        return repository.findAll();
    }

    ...

ProjectRepository.java：

public interface ProjectRepository extends CrudRepository<Project, Long>{
     List<Project> findAll();
}

Answer 1

您是否在 @Repository

上撰写了ProjectRepository注释？

@Repository
public interface ProjectRepository extends CrudRepository<Project, Long>{
     List<Project> findAll();
}

确保使用 @EnableJpaRepositories

在配置上启用了JpaRepository

Answer 2

当我们没有指定在何处查找 JPA 存储库时，我们通常会收到此异常。所以提到@EnableJpaRepositories("your repository package")，在那里你指定@Configuration 或@SpringBootApplication。它会正常工作。

控制器

2 个答案: