Java 将列表序列化为json时出现异常

我无法将对象列表序列化为JSON（Jackson）。我的对象包含带有德语umlaute的字符串（例如ä，ö，ü，ß）。当我将包含这些对象的列表发送到服务器时，会得到一个JsonMappingException：无效的UTF-8中间字节。我100%认为问题出在客户端，因为当我通过邮递员发送JSON字符串时，它工作正常

public static ResponseEntity<?> exchange(String servicePath, HttpMethod method, Class returnClass, List<? extends BaseObject> objectList, Object... uriVariableValues) throws JsonProcessingException, UnsupportedEncodingException
{
    RestTemplate template = new RestTemplate();
    template.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
    template.getMessageConverters().add(new StringHttpMessageConverter(Charset.forName("UTF-8")));

    HttpHeaders headers = new HttpHeaders();
    headers.setContentType(MediaType.APPLICATION_JSON);

    String url = ConfigHandler.getServicePath(servicePath);
    UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(ConfigHandler.getStringProperty("baseUrl"));
    URI uri = builder.path(url).buildAndExpand(uriVariableValues).toUri();
    byte[] bytes = Utils.getJacksonObjectMapper().writeValueAsBytes(objectList);

    //String urlParameters = new String(Utils.getJacksonObjectMapper().writeValueAsString(objectList).getBytes("UTF-8"));
    String urlParameters = new String(bytes, "UTF-8");
    //urlParameters = urlParameters.replaceAll("ß", "HURZ");
    System.out.println("WebUtils.exchange - JSON: "+urlParameters);

    HttpEntity<String> entity = new HttpEntity<>(urlParameters, headers);

    return template.exchange(uri, method, entity, returnClass);
}

public static ObjectMapper getJacksonObjectMapper()
{
    ObjectMapper mapper = new ObjectMapper()
            .registerModule(new ParameterNamesModule())
            .registerModule(new Jdk8Module()).registerModule(new JavaTimeModule());
    mapper.disable(SerializationFeature.WRITE_DATES_AS_TIMESTAMPS);
    mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);

    return mapper;
}

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publicstaticresponseentity交换（stringservicepath，HttpMethod方法，Class returnClass，List在客户端设置正确的编码：

updateRequest.setHeader("Content-Type", "application/json;charset=UTF-8");
StringEntity entity= new StringEntity(json, "UTF-8");
updateRequest.setEntity(entity);

如果将来有人偶然发现这个问题，解决方案是在HttpHeader中再添加一点：

HttpHeaders headers = new HttpHeaders();
MediaType mediaType = new MediaType("application", "json", Charset.forName("UTF-8"));
headers.setContentType(mediaType);
headers.setAccept(Arrays.asList(MediaType.APPLICATION_JSON));
headers.setAcceptCharset(Arrays.asList(Charset.forName("UTF-8")));

我也是这么想的。我只是不知道如何使用Jackson实现这一点。可能需要对url参数进行编码：我使用的是Spring类，我更愿意使用Spring。因此没有StringEntity