“我需要类型的bean”错误：春季启动

Question

当我尝试执行SpringBoot时出现错误。因为我需要一个“ bean”，所以我不明白为什么要得到这个，我有所有注释

17-09-2018 12:24:53.905 [restartedMain] WARN  o.s.b.c.e.AnnotationConfigEmbeddedWebApplicationContext.refresh - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'parameterController': Unsatisfied dependency expressed through field 'pgService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'parameterServiceImp': Unsatisfied dependency expressed through field 'pgRepository'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'es.my.repository.ParameterRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}

更多错误：

---

申请无法开始

---

Description:

Field pgRepository in es.service.ParameterServiceImp required a bean of type 'es.repository.ParameterRepository' that could not be found.


Action:

Consider defining a bean of type 'es.repository.ParameterRepository' in your configuration.

我在控制器中->使用@Autowired

@RestController
@RequestMapping(value = { "/param" })
@CrossOrigin
public class ParameterController {

    @Autowired
    ParameterService pgService;

    @RequestMapping(method = RequestMethod.GET, value = "/get", produces = 
    MediaType.APPLICATION_JSON_VALUE)
    public List<Parameter> getAllParameters() {
        List<Parameter> list = pgService.selectAll();
        return list;
    }

在我的服务中->我不使用注释

public interface ParameterService {
    public List<Parameter> selectAll();
}

Imple->我使用Service和Autowired

@Service
public class ParameterServiceImp implements ParameterService {
    @Autowired
    ParameterRepository pgRepository;

    public List<Parameter> selectAll() {
        return pgRepository.findAll());
    }
}

存储库->在这里，我有查询。

public interface ParameterRepository extends CrudRepository<Parameter, String> {
}

型号-> 我的POJO

@Entity
@Table(name = "Parameter")
public class Parameter {

    @Id
    @NotNull
    @Column(name = "ID")
    private String id;

    @NotNull
    @Column(name = "name")
    private String name;

// getters setters and construct

}

我有@Entity，@Service，@Autowired但出现错误

Answer 1

如果在未指定@SpringBootApplication的情况下使用basePackage，它将默认为当前程序包。就像您添加@ComponentScan和@EnableJpaRepositories一样，没有基本包。

如果您将其他软件包设置为@SpringBootApplication，请确保还添加了具有适当basePackage的@EnableJpaRepositories。储存库不会仅被@ComponentScan识别（或通过任何其他显式或隐式方式将其声明为Bean）。

Answer 2

@SpingbootApplication的.some.package软件包吗？ 否则，您需要为基本软件包a.some.package

添加组件扫描注释。

Answer 3

尝试添加下一个注释。

@EnableJpaRepositories(basePackages = {"<repository-package-here>"})