Question

我有一个Bean类活动，它关联配置文件列表和用户Bean。现在如果我试图通过SOLRJ在Solr中插入这个Activity bean，它会给我空指针异常。下面的代码引起了异常：

public <T> boolean insert (T bean) {
    try {
        UpdateResponse response = solrClient.addBean(bean);
        System.out.println("insert bean ElapsedTime: " + response.getElapsedTime());
        solrClient.commit();
        return true;
    } catch (IOException | SolrServerException e) {
        e.printStackTrace();
    }
    return false;
}

Answer 1

如果您正在使用Solr6并获得空指针异常，请参阅： SOLRJ-6.0.0: Insertion of a bean object which associate list of bean object is giving null pointer exception

但是，如果您尝试插入一个与嵌套bean相关联的bean，那么它将为您提供例外：clazz.getName() + " cannot have more than one Field with child=true"

它将通过 DocumentObjectBinder SolrJ类的下面一段代码：

@SuppressForbidden(reason = "Needs access to possibly private @Field annotated fields/methods")
  private List<DocField> collectInfo(Class clazz) {
    List<DocField> fields = new ArrayList<>();
    Class superClazz = clazz;
    List<AccessibleObject> members = new ArrayList<>();

    while (superClazz != null && superClazz != Object.class) {
      members.addAll(Arrays.asList(superClazz.getDeclaredFields()));
      members.addAll(Arrays.asList(superClazz.getDeclaredMethods()));
      superClazz = superClazz.getSuperclass();
    }
    boolean childFieldFound = false;
    for (AccessibleObject member : members) {
      if (member.isAnnotationPresent(Field.class)) {
        AccessController.doPrivileged((PrivilegedAction<Void>) () -> { member.setAccessible(true); return null; });
        DocField df = new DocField(member);
        if (df.child != null) {
          if (childFieldFound)
            throw new BindingException(clazz.getName() + " cannot have more than one Field with child=true");
          childFieldFound = true;
        }
        fields.add(df);
      }
    }
    return fields;
  }

Answer 2

请参阅以下网址，了解嵌套文档的插入和搜索：

Searching for nested Documents in Solr(J)

Answer 3

HttpSolrServer solr = new HttpSolrServer( SOLR_URL );

        // Docs to submit
        Collection<SolrInputDocument> batch = new ArrayList<SolrInputDocument>();

        // Parent Doc 1, a person mamed John Jones
        SolrInputDocument person1 = new SolrInputDocument();
        person1.addField( "id",            "john_jones" );
        person1.addField( "content_type",  "person"     );
        // "_t" suffix tells Solr that it's text
        person1.addField( "first_name_t",  "John"       );
        person1.addField( "last_name_t",   "Jones"      );
        // states and history used in edismax examples
        person1.addField( "states_t",      "California Nevada Idaho Maine" );
        person1.addField( "history_t",     "safe accident accident accident accident accident" );

        // child docs, the vehicles he owns
        SolrInputDocument p1_car1 = new SolrInputDocument();
        p1_car1.addField( "id",            "jj_car1"    );
        p1_car1.addField( "content_type",  "car"        );
        // For cars "make" is an alias for "manufacturer"
        p1_car1.addField( "make_t",        "Honda"      );
        p1_car1.addField( "model_t",       "Accord"     );

        SolrInputDocument p1_car2 = new SolrInputDocument();
        p1_car2.addField( "id",            "jj_car2"    );
        p1_car2.addField( "content_type",  "car"        );
        p1_car2.addField( "make_t",        "Nissan"     );
        p1_car2.addField( "model_t",       "Maxima"     );

        SolrInputDocument p1_bike1 = new SolrInputDocument();
        p1_bike1.addField( "id",           "jj_bike1"   );
        p1_bike1.addField( "content_type", "bike"       );
        p1_bike1.addField( "make_t",       "Yamaha"     );
        p1_bike1.addField( "model_t",      "Passion"    );

        SolrInputDocument p1_bike2 = new SolrInputDocument();
        p1_bike2.addField( "id",           "jj_bike2"   );
        p1_bike2.addField( "content_type", "bike"       );
        p1_bike2.addField( "make_t",       "Peugeot"    );
        p1_bike2.addField( "model_t",      "Vivacity"   );

        // Add children to parent
        person1.addChildDocument( p1_car1  );
        person1.addChildDocument( p1_car2  );
        person1.addChildDocument( p1_bike1 );
        person1.addChildDocument( p1_bike2 );

        // Add parent to batch
        batch.add( person1 );


        // Parent Doc 2, person mamed Satish Smith
        SolrInputDocument person2 = new SolrInputDocument();
        person2.addField( "id",           "satish_smith" );
        person2.addField( "content_type", "person"       );
        person2.addField( "first_name_t", "Satish"       );
        person2.addField( "last_name_t",  "Smith"        );
        person2.addField( "states_t",     "California Texas California Maine Vermont Connecticut" );
        person2.addField( "history_t",    "safe safe safe safe safe safe safe safe accident" );

        // Vehicles (child docs)
        SolrInputDocument p2_car1 = new SolrInputDocument();
        p2_car1.addField( "id",            "ss_car1"     );
        p2_car1.addField( "content_type",  "car"         );
        p2_car1.addField( "make_t",        "Peugeot"     );
        p2_car1.addField( "model_t",       "iOn"         );
        SolrInputDocument p2_bike1 = new SolrInputDocument();
        p2_bike1.addField( "id",           "ss_bike1"    );
        p2_bike1.addField( "content_type", "bike"        );
        p2_bike1.addField( "make_t",       "Honda"       );
        p2_bike1.addField( "model_t",      "Spree"       );
        // link objects and add to batch
        person2.addChildDocument( p2_car1  );
        person2.addChildDocument( p2_bike1 );
        batch.add( person2 );

        System.out.println( "Adding batch of " + batch.size() + " parent docs" );

        // Submit as a group
        solr.add( batch );
        solr.commit();

Answer 4

通过使用 SolrInputDocument 类，我可以插入包含多个嵌套文档的文档，甚至 addBeans 方法（在SolrJ Code下面）也是这样做的。因此，我应该为每个bean构建 SolrInputDocument 对象以进行索引。这是唯一的解决方案。

     public UpdateResponse addBeans(String collection, Collection<?> beans, int commitWithinMs) throws SolrServerException, IOException {
    DocumentObjectBinder binder = this.getBinder();
    ArrayList<SolrInputDocument> docs =  new ArrayList<>(beans.size());
    for (Object bean : beans) {
      docs.add(binder.toSolrInputDocument(bean));
    }
    return add(collection, docs, commitWithinMs);
  }

如何在SolrJ中插入有多个子Bean的Bean对象

4 个答案: