Java：自定義枚舉驗證器注釋未在 Spring RestControllerAdvice 異常處理程序中觸發

Question

自定義枚舉驗證器注釋接口：

@Target({METHOD, FIELD, ANNOTATION_TYPE, CONSTRUCTOR, PARAMETER, TYPE_USE})
@Retention(RUNTIME)
@Documented
@Constraint(validatedBy = PanTypeSubSetValidator.class)
public @interface PanTypeSubset {
    PanType[] anyOf();
    String message() default "must be any of {anyOf}";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

和實際實現：

public class PanTypeSubSetValidator implements ConstraintValidator<PanTypeSubset, PanType> {
    private PanType[] subset;

    @Override
    public void initialize(PanTypeSubset constraint) {
        this.subset = constraint.anyOf();
    }

    @Override
    public boolean isValid(PanType value, ConstraintValidatorContext context) {
        return value == null || Arrays.asList(subset).contains(value);
    }
}

以及請求 DTO 中的用法：

@SuperBuilder
@Data
@NoArgsConstructor
public class PanBaseRequestDto {

    @NotNull(message = "'PANTYPE' cannot be empty or null")
    @PanTypeSubset(anyOf = {PanType.PAN, PanType.TOKEN}, message = "yesssss")
    private PanType panType;

}

問題是這個注釋似乎永遠不會被觸發。 在實際驗證之前，我在 @RestControllerAdvice DefaultExceptionHandler 實現中遇到了另一個異常：

Handling generic exception: (Invalid JSON input: Cannot deserialize value of type `...pantoken.PanType` from String "PAN1": not one of the values accepted for Enum class: [TOKEN, PAN]; nested exception is com.fasterxml.jackson.databind.exc.InvalidFormatException: Cannot deserialize value of type `...pantoken.PanType` from String "PAN1": not one of the values accepted for Enum class: [TOKEN, PAN]

Answer 1

通過在ENUM類中創建自定義@JsonCreator函數來解決它。 不是最好的方法，因為我們在向最終客戶端顯示錯誤時丟失了用戶提交的值，但對我來說沒問題。

@JsonCreator
public static PanType create(String value) {
    if (Objects.isNull(value)) {
        return null;
    }

    return Arrays.stream(PanType.values())
            .filter(v -> value.equals(v.getType()))
            .findFirst()
            .orElse(PanType.UNKNOWN);
}