JSON反序列化失败：although at least one Creator exists): can only instantiate non-static inner class by usi

背景：使用restTemplate推送数据给第三方时，ResponseEntity内部反序列化失败。

@Slf4j
@Component
public class MessagePush {@Value("${xxxx.pushUrl}")private String pushUrl;@Autowiredprivate RestTemplate restTemplate;public void push(String msg) {log.info("监听到数据：" + msg);Map<String, String> params = new HashMap<>();params.put("apiKey", "22222");params.put("apiSecret", "1111");params.put("content", msg);HttpHeaders headers = new HttpHeaders();headers.setContentType(MediaType.APPLICATION_JSON_UTF8);HttpEntity<Map<String, String>> httpEntity = new HttpEntity<>(params, headers);ResponseEntity<Result> responseEntity = restTemplate.postForEntity(URI.create(pushUrl), httpEntity, Result.class);log.info("responseEntity对象为：{}", responseEntity);if (responseEntity.getStatusCodeValue() == 200 && responseEntity.getBody().getCode().equals(0)) {log.info("成功推送数据：{}", msg);} else {log.error("发送失败，失败原因：{}", responseEntity.getBody().getMessage());}}@Datapublic class Result { // 一开始定义的是非静态内部类private Integer code;private String message;private Object data;}}

报错信息：

Error while extracting response for type
[class com.demo.third.MessagePush$Result] and content type [application/json;charset=UTF-8];
nested exception is org.springframework.http.converter.HttpMessageNotReadableException: JSON parse error:
Cannot construct instance of `com.demo.third.MessagePush$Result`
(although at least one Creator exists): can only instantiate non-static inner class by using default, no-argument constructor;
nested exception is com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot construct instance of `com.demo.third.MessagePush$Result` (although at least one Creator exists):
can only instantiate non-static inner class by using default, no-argument constructor
at [Source: (PushbackInputStream); line: 2, column: 3]

解决：因为定义的Result是内部类，在反序列化时没有外部对象的实例，所以无法完成实例化，必须是静态内部类，才能在该类的内部直接new Result()；方式来对内部类进行实例化，所以将Result类定义为静态的即可。

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JSON反序列化失败：although at least one Creator exists): can only instantiate non-static inner class by usi

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