RestClientException：无法写入请求：找不到适合请求类型的 HttpMessageConverter

Question

我正在尝试使用 RestTemplate 向 REST 服务发送 POST 请求，但出现以下错误

RestClientException：无法写入请求：找不到适合请求类型 [xxx.query.XBrainQueryRequest] 和内容类型 [application/json] 的 HttpMessageConverter。

XBrainQueryRequest request = new XBrainQueryRequest();
// set query ID
request.setQueryId(XBrainTradequeryId);
request.setFlags(new String[]{"ALL_FIELDS"});
ObjectMapper objectMapper = new ObjectMapper();

logger.info("calling XBrainTradeQuery and  Input:{}",objectMapper.writeValueAsString(request));

HttpHeaders headers = new HttpHeaders();

headers.setContentType(MediaType.APPLICATION_JSON);

 try
       {
       restTemplate = new RestTemplate();

       ResponseEntity<XBrainTradeList> result=null;
       xBrainTradeList =null;

       ResponseEntity<XBrainTradeList> result1 = restTemplate.exchange(XBrainTradeQueryURL, HttpMethod.POST, new HttpEntity(request, headers), XBrainTradeList.class);

我的 XBrainQueryRequest 类如下

@JsonSerialize(include = JsonSerialize.Inclusion.NON_NULL)
public class XBrainQueryRequest {

    private String queryId;
    private String[] flags;
    private String[] attributes;

    /**
     * @return the queryId
     */

    public String getQueryId() {
        return queryId;
    }

    public XBrainQueryRequest(String queryId, String[] flags, String[] attributes) {
        super();
        this.queryId = queryId;
        this.flags = flags;
        this.attributes = attributes;
    }

    public XBrainQueryRequest() {
    }

    public XBrainQueryRequest(String queryId, String[] flags) {
        super();
        this.queryId = queryId;
        this.flags = flags;
    }

    /**
     * @param queryId
     *            the queryId to set
     */
    public void setQueryId(String queryId) {
        this.queryId = queryId;
    }

    public String[] getFlags() {
        return flags;
    }

    public void setFlags(String[] flags) {
        this.flags = flags;
    }

    public String[] getAttributes() {
        return attributes;
    }

    public void setAttributes(String[] attributes) {
        this.attributes = attributes;
    }

}

有人可以解释我为什么会出错以及如何解决它。我对这些东西很陌生。

Answer 1

解决。将请求参数替换为objectMapper.writeValueAsString(request). JSON请求值存在格式问题。

旧代码

ResponseEntity<XBrainTradeList> result1 =
    restTemplate.exchange(
        XBrainTradeQueryURL,
        HttpMethod.POST,
        new HttpEntity(request, headers),
        XBrainTradeList.class);

新代码

ResponseEntity<String> rest= 
    restTemplate.exchange(
        XBrainTradeQueryURL,
        HttpMethod.POST, 
        new HttpEntity(objectMapper.writeValueAsString(request), headers), 
        String.class);

我也采取了String格式的回应。