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我正在使用 Spring REST 模板从 REST 服务获取响应。我收到以下异常，但我无法找出问题所在。请找到以下详细信息。我错过了什么吗？

当我使用 Postman 尝试此操作时，我得到了正确的响应。

这里 AddFileServerBean 是请求：

RestTemplate restTemplate = new RestTemplate();
HttpHeaders headers = new HttpHeaders();
headers.setBasicAuth(username, password);
headers.setContentType(MediaType.APPLICATION_JSON);
HttpEntity<AddFileServerBean> requestEntity = new HttpEntity<AddFileServerBean>(addFileServerBean,headers);
ResponseEntity<ResponseObject> response = restTemplate.exchange(endPointUrl, HttpMethod.POST, requestEntity, ResponseObject.class);

例外

Exception in thread "main" java.lang.NoSuchMethodError: org.springframework.util.Assert.noNullElements(Ljava/util/Collection;Ljava/lang/String;)V
at org.springframework.web.client.HttpMessageConverterExtractor.<init>(HttpMessageConverterExtractor.java:77)
at org.springframework.web.client.RestTemplate$ResponseEntityResponseExtractor.<init>(RestTemplate.java:991)
at org.springframework.web.client.RestTemplate.responseEntityExtractor(RestTemplate.java:822)
at org.springframework.web.client.RestTemplate.exchange(RestTemplate.java:585)
at addfileserver.rest.FileRestTemplate.main(FileRestTemplate.java:280)

HttpMessageConverterExtractor 的源代码

@SuppressWarnings("unchecked")
HttpMessageConverterExtractor(Type responseType, List<HttpMessageConverter<?>> messageConverters, Log logger) {
    Assert.notNull(responseType, "'responseType' must not be null");
    Assert.notEmpty(messageConverters, "'messageConverters' must not be empty");
    Assert.noNullElements(messageConverters, "'messageConverters' must not contain null elements");
    this.responseType = responseType;
    this.responseClass = (responseType instanceof Class ? (Class<T>) responseType : null);
    this.messageConverters = messageConverters;
    this.logger = logger;
}

我预期的响应对象

{
    "dataObj": {
        "responseCode": 0,
        "messageList": [
            "Test"
        ],
        "values": {
            "uniqueId": "Test",
            "pwd": "Test"
        },
        "objectValue": "-"
    },
    "applicationErrors": null
}
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1 回答 1

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我认为问题在于当您尝试将从 REST 端点接收到的输出映射到 ResponseObject 时。

同样在创建 RestTemplate 的实例时，试试这个：

public RestTemplate getRestTemplateInstance(String baseUri) {
    RestTemplate restTemplate = new RestTemplate();
    restTemplate = new RestTemplate();
    restTemplate.getMessageConverters().add(new MappingJackson2HttpMessageConverter());
    restTemplate.getMessageConverters().add(new StringHttpMessageConverter());
    return restTemplate;
}

通过传递 baseUri 获取 RestTemplate 实例并调用您的 REST 端点。

于 2020-01-16T09:22:56.987 回答