Spring 运行时错误，没有为实体指定标识符：

Question

Java 和 Spring 的新手。尝试创建应用程序但未成功。我的应用程序中有以下实体和控制器。但在运行时我得到一个错误。我发布了 sn-ps 以便于阅读。

staff.java

@Data
@Entity
public class Staff {
    private int staff_id;
    private String staff_name;
    private String staff_email;
    @OneToMany(fetch = FetchType.LAZY, mappedBy = "staff")
    private List<VisitRequest> visitRequest;


    public String getStaff_name(){
        return staff_name;
    }
    public void setStaff_name(String staff_name){
        this.staff_name = staff_name;
    }
    public String getStaff_email(){
        return staff_email;
    }
    public void setStaff_email(String staff_email){
        this.staff_email = staff_email;
    }

    public int getStaff_id(){
        return staff_id;
    }

    public void setStaff_id(int staff_id){
        this.staff_id = staff_id;
    }


}

StaffController.java

@Controller
@RestController
@RequestMapping("/staff/")
public class StaffController{
@Autowired
    protected StaffRepository staffRepository;


    @GetMapping("/Staff")
    public List<Staff> getAllStaff() {
        return staffRepository.findAll();
    }


    @GetMapping("/staff/{Staff_id}")
    public ResponseEntity<Staff> getStaffById(@PathVariable(value = "Staff_id") Long Staff_id)
    throws ResourceNotFoundException{
    Staff staff = staffRepository.findById(Staff_id)
            .orElseThrow(() -> new ResourceNotFoundException("Employee not Found"));
    return ResponseEntity.ok().body(staff);

而运行时抛出的错误是

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaConfigura
tion.class]: Invocation of init method failed; nested exception is org.hibernate.AnnotationException: No identifier specified for entity: com.Vportal.data.model.Staff

请指教该怎么做。

Answer 1

您的Staff 实体缺少带有@Id 注释的成员。这可以添加到staff_id，如下所示：

@Data
@Entity
public class Staff {
    @Id
    private int staff_id;

    ....
}