java error : constructor is already defined in class - using lombok

Question

错误

java: constructor Restaurant() is already defined in class  
com.example.order_system.domain.Restaurant

当我添加此 class 和 运行 程序时出现

@Entity
@NoArgsConstructor
@RequiredArgsConstructor
@Getter
@Setter
@ToString
public class Restaurant {

    @Id
    @GeneratedValue
    private long id;

    @NotEmpty(message = "The restaurant must have a name")
    private String name;

    @NotEmpty(message = "Please add a description for this restaurant")
    private String description;

    @NotEmpty(message = "The restaurant must have a location")
    private String location;

    @OneToMany(mappedBy = "restaurant", fetch = FetchType.EAGER)
    private List<ContactDetails> contactDetails = new ArrayList<>();

}

Answer 1

尝试将@RequiredArgsConstructor 更改为@AllArgsConstructor，这很好。 在 documentation

中查看更多信息

Answer 2

如 documentation 中所述，@RequiredArgsConstructor 是使用 final 个字段构建的：

@RequiredArgsConstructor generates a constructor with 1 parameter for each field that requires special handling. All non-initialized final fields get a parameter, as well as any fields that are marked as @NonNull that aren't initialized where they are declared. For those fields marked with @NonNull, an explicit null check is also generated. The constructor will throw a NullPointerException if any of the parameters intended for the fields marked with @NonNull contain null. The order of the parameters match the order in which the fields appear in your class.

因此，要么删除@RequiredArgsConstructor 注释，要么用final 关键字（或@NonNull 注释）标记一些字段。