嵌套的 TypeReference 在 RestTemplate 和 ObjectMapper 之间不起作用

如何解决嵌套的 TypeReference 在 RestTemplate 和 ObjectMapper 之间不起作用

使用Spring RestTemplate的execute方法作为：-

RestTemplate template = new RestTemplate();
List<Feed> Feeds = template.execute(inApiUrl,HttpMethod.GET,new CustomrequestCallback(inEncryptedApiKey),new CustomresponseExtractor<List<Feed>>());

自定义响应提取器：-

public static class CustomresponseExtractor<T> implements ResponseExtractor<T> {

    @Override
    public T extractData(ClientHttpResponse inResponse) throws IOException {
        String json = IoUtils.toString(inResponse.getBody());
        if (StringUtils.isEmpty(json)) {
            return null;
        }
        T data = null;
        try {
            ObjectMapper objectMapper = new ObjectMapper();
            objectMapper.configure(DeserializationFeature.FAIL_ON_UNKNowN_PROPERTIES,false);
            // THIS IS WHERE THE GENERIC T IS NOT GETTING CAPTURED CORRECTLY
            data = objectMapper.readValue(json,new TypeReference<T>(){});
        } catch (Exception e) {
            LOGGER.error("Error ... ",e);
        }
        return data;
    }
}

响应看起来像：-

[{ "id": 8,"name": "Dev","writeAccess": true  },{ "id": 1,"name": "Default Feed","writeAccess": false }]

Feed 对象：-

@JsonInclude(JsonInclude.Include.NON_NULL)
@JsonPropertyOrder({
    "id","name","writeAccess"
})
public class Feed {
  @JsonProperty("id")
  private Integer _id;
  @JsonProperty("name")
  private String _name;
  @JsonProperty("writeAccess")
  private Boolean _writeAccess;

  public Integer getId() {
    return _id;
  }

  public void setId(Integer inId) {
    _id = inId;
  }

  public String getName() {
    return _name;
  }

  public void setName(String inName) {
    _name = inName;
  }

  public Boolean getWriteAccess() {
    return _writeAccess;
  }

  public void setWriteAccess(Boolean inWriteAccess) {
    _writeAccess = inWriteAccess;
  }
}

此设置导致数据为 LinkedHashMap 列表而不是 Feed 列表（自定义对象）

我不是在寻找解决办法。我想知道为什么这不起作用？

注意：将 new TypeReference>(){} 直接提供给 objectMapper.readValue() 有效