我对spring验证有一个奇怪的问题，我有一个类是object value，我在它的字段上添加了一些验证注解。我已经编写了一些单元测试来证明注解工作正常。但是当我发送空值时，当涉及到测试控制器时，验证不起作用，让数据进入。这是我的价值目标：

@Data
@ToString

public class NameEN {

    @NotNull(message = "Name can not be null!")
    @Size(min=4, message = "Name length should be more than 3 characters!")
    @Pattern(regexp = "[a-zA-Z]+")
    private  String nameEn;

   // @JsonCreator(mode = JsonCreator.Mode.PROPERTIES)
    public NameEN(String nameEn) {
        this.nameEn = nameEn;

    }

这里是我使用这个值对象的地方：

@Data
@NoArgsConstructor
@AllArgsConstructor
public class CreateCategory {
    @Valid
    private String name_en;
    @Valid
    private String name;
    private int parent;
    private String image;
    private String kind;
    private int priority;
    private boolean visibility;

    public Category asCategory(){
        return new Category(new NameEN(name_en),new Name(name),parent,image,kind,priority,visibility);
    }

}

这是我的dto：

@Data
@Entity
@Table(name = "category")
 class CategoryDTO {
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Long id;
   @Valid
    private String name_en;
   @Valid
    private  String name;
    private int parent;
    private String image;
    private String kind;
    private int priority;
    private boolean visibility;
    private boolean deleted;
    @CreationTimestamp
    private Timestamp cdt;
    @UpdateTimestamp
    private Timestamp udt;

    public CategoryDTO() {
    }

    public CategoryDTO(Long id, @Valid String name_en, @Valid String name, int parent, String image, String kind, int priority, boolean visibility, boolean deleted, Timestamp cdt, Timestamp udt) {
        this.id = id;
        this.name_en = name_en;
        this.name = name;
        this.parent = parent;
        this.image = image;
        this.kind = kind;
        this.priority = priority;
        this.visibility = visibility;
        this.deleted = deleted;
        this.cdt = cdt;
        this.udt = udt;
    }

    public static CategoryDTO from(Category category){
        return new CategoryDTO(category.getId(),category.getName_en().asRaw(),category.getName().asRaw(),category.getParent(),category.getImage(),category.getKind(),category.getPriority(),category.isVisibility(),category.isDeleted(),category.getCdt(),category.getUdt());
    }

    Category asCategory(){
        return new Category(new NameEN(name_en),new Name(name),parent,image,kind,priority,visibility);
    }
    Category asResponse(){
        return new Category(id,new NameEN(name_en),new Name(name),parent,image,kind,priority,visibility);
    }

}

这是控制器：

@PostMapping(value = "create")
public ResponseEntity<?> createCategory(@Valid @RequestBody CreateCategory createCategory) {
    Category category = createCategory.asCategory();
    return ResponseEntity.status(HttpStatus.CREATED).body(categoryRepository.save(category));
}

最后，这是服务：

public Category save(Category category) {
    CategoryDTO dto= CategoryDTO.from(category);
    dto= categoryJpaRepository.saveAndFlush(dto);
    return dto.asResponse();
}

此单元测试通过：

@Test
public void whenNullNameEn_ThenOneConstraintViolation(){

    validator = Validation.buildDefaultValidatorFactory().getValidator();
    NameEN nameEN = new NameEN(null);
    validator.validate(nameEN).stream().forEach(violation -> System.out.println(violation.getMessage()));
    Set<ConstraintViolation<NameEN>> violations = validator.validate(nameEN);

    assertThat(violations.size()).isEqualTo(1);

}

但是当我在postman上发送这个json时，并不能避免创建类别：

{
"name_en":null,
"name": null,
"parent": 1,
"image": "ss",
"kind" :2,
"priority": 1,
"visobility": true
}

Postman 返回：

{
"id": 51,
"name_en": {
    "nameEn": null
},
"name": {
    "name": null
},
"parent": 1,
"image": "ss",
"kind": "2",
"priority": 1,
"visibility": false,
"deleted": false,
"cdt": "2020-12-07T21:12:33.086+00:00",
"udt": "2020-12-07T21:12:33.086+00:00"

}
我的问题在哪里？我检查了所有的东西，我不能理解这个问题！