Jest getSourceAsObject始终返回NULL

时间:2015-04-20 18:59:43

标签: java json elasticsearch jest

我正在尝试将Jest中的几个示例用作ElasticSearch集成的POC。

现在,我正在尝试一个基本的GET。我创建了一个名为Document的POJO。在一些基本的制定者和吸气者是一些领域。我填充它,然后使用GSON生成JSON文本。

从这个生成的JSON中,我进入ElasticSearch Sense并执行以下操作:

PUT /reports/documents/3
{
    // JSON code
}

这很好。然后我尝试使用Get从Java中提取值,如下所示:

JestClientFactory factory = new JestClientFactory();

factory.setHttpClientConfig(new HttpClientConfig
                            .Builder("http://localhost:9200")
                            .multiThreaded(true)
                            .build());

client = factory.getObject();

Get get = new Get.Builder("reports", "3").type("documents").build();

try {
    JestResult result = client.execute(get);
    String json = result.getJsonString();
    System.out.println(json);

    Document doc = null; 
    doc = result.getSourceAsObject(Document.class);
    System.out.println("is doc null? " + doc == null);
}catch (Exception e) {
    System.err.println("Error getting document");
    e.printStackTrace();
}

字符串json返回我期望的内容(显示_index,_type,_id,当然还有_source)。但是,doc始终为NULL。我不确定为什么会这样。

为了看看这是否只是一个Get问题,我继续尝试搜索。我做了以下代码片段:

try {
    SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder();
    searchSourceBuilder.query(QueryBuilders.matchQuery("reportNumber", "101221895CRT-004"));

    Search search = new Search.Builder(searchSourceBuilder.toString())
                                        // multiple index or types can be added.
                                        .addIndex("reports")
                                        .addType("documents")
                                        .build();

    SearchResult result = client.execute(search);

    //List<Document> results = result.getSourceAsObjectList(Document.class);

    List<SearchResult.Hit<Document, Void>> hits = result.getHits(Document.class);

    for (SearchResult.Hit hit : hits) {
        Document source = (Document) hit.source;
        Void ex = (Void) hit.explanation;

        System.out.println();
    }

    System.out.println("Result size: " + hits.size());
}catch (Exception e) {
    System.err.println("Error searching");
    e.printStackTrace();
}

查看result时,会显示对象的JSON。但是,List<Document> results表示为NULL。使用hits时,匹配的大小是正确的,但是&#34;来源&#34;和&#34;前&#34;都是NULL。

关于我做错了什么的任何想法?

更新
在阅读了Cihat的评论之后,我继续进行了记录。事实证明我在尝试转换日期时遇到错误(因此它为什么总是以NULL返回)。

我收到以下错误消息:

Unhandled exception occurred while converting source to the object .com.someCompanyName.data.Document
com.google.gson.JsonSyntaxException: java.text.ParseException: Unparseable date: "Nov 6, 2014 8:29:00 AM"

我尝试了所有不同的格式:

  • 11/06/2014 8:29:00 AM(没有时间,只有14岁)
  • 06-NOV-2014 8:29:00 AM(没有时间,只有14岁)
  • 2014-11-06 8:29:00 AM(时间和年份变化相同)
  • 2014-NOV-06 8:29:00 AM(时间和年份变化相同)
  • 06/11/2014 8:29:00 AM(同样的事情)

所有这些都失败了。我确定我尝试了其他一些格式,所以不确定日期应该是什么格式。我甚至尝试了DateFormat JavaDocs的确切日期,但它仍然失败了。每次我进行搜索时,它都会在GsonBuilder中定义Dateformat,但是在Jest中我无法访问它。

1 个答案:

答案 0 :(得分:0)

此测试用例演示了如何使用Jest索引文档,然后将相同的文档取回。不是一个完整的答案,但希望看到已知可行的东西是有用的。

import io.searchbox.client.JestClient;
import io.searchbox.client.JestClientFactory;
import io.searchbox.client.JestResult;
import io.searchbox.client.config.HttpClientConfig;
import io.searchbox.core.Get;
import io.searchbox.core.Index;
import static org.hamcrest.Matchers.*;
import static org.hamcrest.MatcherAssert.*;
import org.junit.Test;

public class JestRoundtripIT {

  public static final String INDEX = "reports";
  public static final String TYPE = "documents";
  public static final String ID = "3";

  @Test
  public void documentRoundTrip() throws Exception {
    JestClientFactory factory = new JestClientFactory();

    factory.setHttpClientConfig(new HttpClientConfig
                                .Builder("http://localhost:9200")
                                .multiThreaded(true)
                                .build());

    JestClient client = factory.getObject();

    Document original = new Document()
      .withAuthor("Shay Banon")
      .withContent("You know, for search...");

    JestResult indexResult = client.execute(
      new Index.Builder(original)
        .index(INDEX)
        .type(TYPE)
        .id(ID)
        .build());
    assertThat(indexResult.isSucceeded(), equalTo(true));

    JestResult getResult = client.execute(
      new Get.Builder(INDEX, ID)
      .type(TYPE)
      .build());
    assertThat(getResult.isSucceeded(), equalTo(true));

    Document fromEs = getResult.getSourceAsObject(Document.class);

    assertThat(fromEs, notNullValue());
    assertThat(fromEs.getAuthor(), equalTo(original.getAuthor()));
    assertThat(fromEs.getContent(), equalTo(original.getContent()));
  }

  public static class Document {
    protected String author;
    protected String content;
    public Document withAuthor( String author ) {
      this.author = author;
      return this;
    }

    public Document withContent( String content ) {
      this.content = content;
      return this;
    }

    public String getAuthor() {
      return author;
    }

    public void setAuthor( String author ) {
      this.author = author;
    }

    public String getContent() {
      return content;
    }

    public void setContent( String content ) {
      this.content = content;
    }
  }
}