我正在尝试将JSON对象发送到Spring控制器，控制器将请求主体作为Map<String, Object>接收，JSON本身是正确的，通过 Postman 发送相同的JSON也工作正常，只是当我使用HttpClient发送它时。
下面是我尝试发送的JSON：

{"fruit": "Apple", "color": "Red"}

我的HTTP请求：

ObjectMapper mapper = new ObjectMapper();
mapper.configure(SerializationFeature.FAIL_ON_EMPTY_BEANS, false);
String jsonString = mapper.writeValueAsString(body);

HttpRequest request = HttpRequest.newBuilder()
    .uri(new URI(url))
    .header("content-type", "application/json")
    .POST(BodyPublishers.ofString(jsonString))
    .build();
HttpResponse<String> response = client.send(request, BodyHandlers.ofString());

我的控制器：

@PostMapping(value = "/config/addDocument", consumes = {"application/json"})
public void addDocument(@RequestBody Map<String, Object> document)

我得到这个错误：

HttpMessageNotReadableException: JSON parse error: Cannot construct instance of `java.util.LinkedHashMap` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('{"fruit": "Apple", "color": "Red"}'); nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `java.util.LinkedHashMap` (although at least one Creator exists): no String-argument constructor/factory method to deserialize from String value ('{"fruit": "Apple", "color": "Red"}')<EOL> at [Source: (org.springframework.util.StreamUtils$NonClosingInputStream); line: 1, column: 1]]

我试着用 Postman 发送同样的请求，它工作得很好，创建一个变量字符串并发送过来也工作得很好，关于请求，我做错了什么？

编辑

客户端来自java.net.http.HttpClient软件包。
我使用HttpClient.newHttpClient()创建了客户端
我使用的是Sping Boot Starter Web 2.7.5。

编辑2

根据这个答案，我尝试将输入的JSON字符串转换为Map，然后将Map转换回JSON字符串并发送，这样就成功了。

ObjectMapper mapper = new ObjectMapper();
      Map<String, Object> map = mapper.readValue(body, Map.class);
      String jsonString = mapper.writeValueAsString(map);

      HttpRequest request = HttpRequest.newBuilder()
          .uri(new URI(url))
          .header("content-type", "application/json")
          .POST(HttpRequest.BodyPublishers.ofString(jsonString))
          .build();
      HttpResponse<String> response = client.send(request, BodyHandlers.ofString());