mget producing：无法解析响应的响应主体

Question

我正在通过 Java 高级 REST 客户端发出 Multi-Get request，我收到以下异常：

"Unable to parse response body for Response{requestLine=POST /_mget HTTP/1.1, host=http://localhost:9200, response=HTTP/1.1 200 OK}"

我从发送到 Elastic 的日志中提取了以下 JSON：

{
    "docs": [
        {
            "_index": "blah",
            "_type": null,
            "_id": "some-id-232332",
            "routing": null,
            "stored_fields": null,
            "version": -3,
            "version_type": "internal",
            "_source": {
                "includes": [],
                "excludes": []
            }
        }
    ]
}

我通过 Postman 将上述 JSON 发送到 Elastic，我看到了以下响应（与我在日志中看到的相同）：

{
    "docs": [
        {
            "_index": "blah",
            "_type": null,
            "_id": "some-id-232332",
            "found": false
        }
    ]
}

这不是一个有效的回应吗？这是 elasticsearch-rest-high-level-client 的问题吗？

弹性 7.5.0，org.elasticsearch.client:elasticsearch-rest-high-level-client:7.5.2

Answer 1

我需要检查异常的 getCause() 以了解真正的问题。我在 mapper.readValue(nullBytes, Customer.class); 上将 null 传递给 Jackson 才是真正的问题。

很有趣a NPE shows itself ‍♂️。

Stack trace: java.util.concurrent.ExecutionException: java.io.IOException: Unable to parse response body for Response{requestLine=POST /_mget HTTP/1.1, host=http://localhost:9200, response=HTTP/1.1 200 OK}
...
...
THE REAL PROBLEM IS HERE!!!
Caused by: java.lang.IllegalArgumentException: argument "src" is null at com.fasterxml.jackson.databind.ObjectMapper._assertNotNull(ObjectMapper.java:4429)

restHighLevelClient.mgetAsync(multiGetRequest, RequestOptions.DEFAULT, new ActionListener<MultiGetResponse>() {
    @Override
    public void onResponse(MultiGetResponse response) {
      for (var responseItem : response.getResponses()) {
        try {
          // simulating a null source
          byte[] nullBytes = null;
          customer = mapper.readValue(nullBytes, Customer.class);
        } catch (IOException e) {
          result.completeExceptionally(e);
        }
      }
      result.complete(true);
    }

    @Override
    public void onFailure(Exception ex) {
      //the real problem!!!
      //log.error("ex.cause", ex.getCause());
      log.error("error with mget", ex);
      result.completeExceptionally(ex);
    }
  });

Full source of repro, Full log file

mget producing：无法解析响应的响应主体

mget producing: Unable to parse response body for Response

elasticsearch

mget

resthighlevelclient