500 Internal Server错误中的弹簧启动发布API

Question

我正在尝试在Spring Boot应用程序中创建帖子API，但它不起作用，我在代码中找不到问题，

这是 service ：

  @Transactional
    public Invoice saveInvoice(Invoice invoice) {
        Invoice newInvoice = invoiceRepository.save(invoice);
        return newInvoice;
    }

这是控制器：

@PostMapping("/save")
public ResponseEntity<Invoice> addInvoice(@RequestBody InvoiceDTO invoice) {
    try {
        Invoice newInvoice = invoiceService
                .saveInvoice(new Invoice(invoice.getSerialNumber(), invoice.getStatus(), invoice.getCreatedDate()));
        return new ResponseEntity<>(newInvoice, HttpStatus.CREATED);
    } catch (Exception e) {
        return new ResponseEntity<>(null, HttpStatus.INTERNAL_SERVER_ERROR);
    }
}

这是模型：

@Entity
@Table(name = "invoice")
public class Invoice {

    @Id
    @GeneratedValue(strategy= GenerationType.IDENTITY)
    private int id;
    @Column(name = "serial_number")
    private long serialNumber;
    @Column(name = "status")
    private String status;
    @Column(name = "created_date")
    private Timestamp createdDate;
    @Column(name = "is_deleted")
    private boolean isDeleted;

    @ManyToOne
    @JoinColumn(name = "customer_id")
    private Customer customer;

    @ManyToOne
    @JoinColumn(name = "employee_id")
    private Employee employee;

    @OneToMany
    private Set<InvoiceHistory> invoiceHistories;

    @ManyToMany
    private Set<Item> items;

    public Invoice(long serialNumber, String status, Timestamp createdDate) {
        this.serialNumber = serialNumber;
        this.status = status;
        this.createdDate = createdDate;
        this.isDeleted = false;
    }
}

但是，当我在Postman中奔跑时，它的返回500内部服务器错误

更新错误消息：

，消息=无法调用 “ com.example.invoices.repository.iinvoicerepository.save（object）” 因为“ this.invoicerepository”为空，路径=/发票/保存}]

问题在哪里？

Answer 1

对于您的服务类，您如何声明和创建 InvoIcerePository ？如果是这样的话：

private InvoiceRepository invoiceRepository;

那么您需要添加 @Autowired ：

@Autowired
private InvoiceRepository invoiceRepository;

如果您确实拥有 @Autowired ，请确保使用 @service /code>：

@Service
public class InvoiceService {...}

如果有的话，请确保您没有在控制器中使用 “ new” 创建 Invoiceservice 。而不是：

private InvoiceService invoiceService = new InvoiceService();

或“ new” Ing 它在构造函数中，
使用 @Autowire

@Autowire
private InvoiceService invoiceService;