我有一個無法通過的測試用例：ContactDTO contactDTO = generateContactDTO();HttpEntity<ContactDTO> request = new HttpEntity<>(contactDTO, headers);ResponseEntity<Response> response = restTemplate.exchange(generateBaseUrl() + "/contacts", HttpMethod.POST, request, Response.class);assertThat(response.getStatusCode()).isEqualTo(HttpStatus.OK);這是我的 ContactDTO 類：public class ContactDTO {    @NotNull    @Size(min = 2, max = 100)    private String firstName;    @NotNull    @Size(min = 2, max = 100)    private String lastName;    @NotNull    @Size(min = 3, max = 100)    private String email;    @NotNull    @Size(min = 3, max = 50)    private String phoneNumber;    @JsonCreator(mode = JsonCreator.Mode.PROPERTIES)    ContactDTO(@JsonProperty("firstName") @NotNull @Size(min = 2, max = 100) String firstName,           @JsonProperty("lastName") @NotNull @Size(min = 2, max = 100) String lastName,           @JsonProperty("email") @NotNull @Size(min = 3, max = 50) String email,           @JsonProperty("phoneNumber") @NotNull @Size(min = 3, max = 50) String phoneNumber) {        this.firstName = firstName;        this.lastName = lastName;        this.email = email;        this.phoneNumber = phoneNumber;    }    String getFirstName() {        return firstName;    }    void setFirstName(String firstName) {        this.firstName = firstName;    }    String getLastName() {        return lastName;    }    void setLastName(String lastName) {        this.lastName = lastName;    }    public String getEmail() {        return email;    }    private void setEmail(String email) {        this.email = email;    }    String getPhoneNumber() {        return phoneNumber;    }    private void setPhoneNumber(String phoneNumber) {        this.phoneNumber = phoneNumber;    }}當我調試它時，我發現所有字段在發送到控制器之前都已填充在 contactDTO 中。但是，在控制器處，僅填充電子郵件字段，并且會導致 HTTP 錯誤請求。PS：我使用Spring Boot 2.1.7.RELEASE