I want to send a Multipart file through an API with contentType = multipart/form-data. When I am trying to send the request using restTemplate in Java SpringBoot. I am getting an exception

@Data
@Builder
@AllArgsConstructor
@NoArgsConstructor
@JsonIgnoreProperties(ignoreUnknown = true)
@JsonNaming(PropertyNamingStrategy.SnakeCaseStrategy.class)
public class GlobalSendAttachmentRequest {

    private String fileType;
    private String sender;
    private String messageStatus;
    private String messageId;
    private String chatId;
    private long messageTimestamp;
    private String userId;
    private String sessionId;
    private String messageType;
    private MultipartFile multipartFile;
}

response = restClient.post(uriComponentsBuilder.build().toString(), getGlobalFileUploadHeaders(), request,
          new ParameterizedTypeReference<GlobalSendAttachmentResponse>() {
          });


@Retry(attempts = 3, types = {IOException.class, ResourceAccessException.class, HttpServerErrorException.class})
  public <E, T> T post(String url, Map<String, String> headers,
                       E requestBody, ParameterizedTypeReference<T> respType) {
    HttpEntity<E> httpEntity = new HttpEntity<>(requestBody, populateHeaders(headers));
    long startTime = System.currentTimeMillis();
    try {
      ResponseEntity<T> response = restTemplate.exchange(url, HttpMethod.POST, httpEntity, respType);
}