Question

我正在尝试为ElasticSearch Integration配置HibernateSearch。我的oracle数据库中有Product表。从该表我尝试根据产品名称进行搜索。

为此我试图将HibernateSearch（ElasticSearch）与oracle数据库集成。

从HibernateSearch获得以下错误：

使用Oracle数据库并在我的pom.xml文件中添加了所需的依赖项

Exception in thread "main" java.lang.IllegalArgumentException: java.lang.Object is not an indexed entity or a subclass of an indexed entity
at org.hibernate.search.batchindexing.impl.MassIndexerImpl.toRootEntities(MassIndexerImpl.java:87)
at org.hibernate.search.batchindexing.impl.MassIndexerImpl.<init>(MassIndexerImpl.java:63)
at org.hibernate.search.batchindexing.impl.DefaultMassIndexerFactory.createMassIndexer(DefaultMassIndexerFactory.java:33)
at org.hibernate.search.impl.FullTextSessionImpl.createIndexer(FullTextSessionImpl.java:175)
at com.test.webservice.elasticsearch.App.doIndex(App.java:36)
at com.test.webservice.elasticsearch.App.main(App.java:109)

使用所有最新的依赖项。

hibernate-search-orm ->5.9.1.Final
hibernate-core ->5.2.16.Final`
ojdbc14 -> 10.2.0.4.0

App.java

public class App 
{

    private static void doIndex() throws InterruptedException {
        Session session = HibernateUtil.getSession();

        FullTextSession fullTextSession = Search.getFullTextSession(session);
        fullTextSession.createIndexer().startAndWait();   // Error occuring on this line

        fullTextSession.close();
    }

    private static List<Product> search(String queryString) {
        Session session = HibernateUtil.getSession();
        FullTextSession fullTextSession = Search.getFullTextSession(session);

        QueryBuilder queryBuilder = fullTextSession.getSearchFactory().buildQueryBuilder().forEntity(Product.class).get();
        org.apache.lucene.search.Query luceneQuery = queryBuilder.keyword().onFields("name").matching(queryString).createQuery();

        // wrap Lucene query in a javax.persistence.Query
        org.hibernate.Query fullTextQuery = fullTextSession.createFullTextQuery(luceneQuery, Product.class);

        List<Product> productList = fullTextQuery.list();

        fullTextSession.close();

        return productList;
    }

    private static void displayContactTableData() {
        Session session = null;
        PropertiesFile propertiesFile= PropertiesFile.getInstance();
        String driverClass = propertiesFile.extractPropertiesFile().getProperty("hibernate.connection.driver_class");
        String connectionURL = propertiesFile.extractPropertiesFile().getProperty("hibernate.connection.url");
        String userName = propertiesFile.extractPropertiesFile().getProperty("hibernate.connection.username");
        String password = propertiesFile.extractPropertiesFile().getProperty("hibernate.connection.password");
        String dialect = propertiesFile.extractPropertiesFile().getProperty("hibernate.dialect");
        String showSQL = propertiesFile.extractPropertiesFile().getProperty("hibernate.show_sql");

        try {
            //session = HibernateUtil.getSession();

            // Fetching saved data
            String hql = "from Product"; 
            @SuppressWarnings("unchecked")

             Configuration cfg=new Configuration()
            .setProperty("hibernate.connection.driver_class", driverClass)
            .setProperty("hibernate.connection.url", connectionURL)
            .setProperty("hibernate.connection.username", userName)
            .setProperty("hibernate.connection.password", password)
            .setProperty("hibernate.dialect", dialect)
            .setProperty("hibernate.show_sql", showSQL)
            .addAnnotatedClass(com.test.webservice.model.Product.class);

             SessionFactory factory=cfg.buildSessionFactory();  
             session=factory.openSession();  
             Transaction t=session.beginTransaction(); 

            List<Product> productList = session.createQuery(hql).list();

            for (Product product : productList) {
                System.out.println("Product Name --->"+product.getName());
            }

        } catch(HibernateException exception){
             System.out.println("Problem creating session factory");
             exception.printStackTrace();
        }finally{
            if(session != null) {
                session.close();
            }
        }
    }

    public static void main(String[] args) throws InterruptedException {
        System.out.println("\n\n******Data stored in Contact table******\n");
        displayContactTableData();

        // Create an initial Lucene index for the data already present in the database
        doIndex();   // Error occuring on this line

        Scanner scanner = new Scanner(System.in);
        String consoleInput = null;

        while (true) {
            // Prompt the user to enter query string
            System.out.println("\n\nEnter search key (To exit type 'X')");      
            System.out.println();
            consoleInput = scanner.nextLine();

            if("X".equalsIgnoreCase(consoleInput)) {
                System.out.println("End");
                System.exit(0);
            }   

            List<Product> result = search(consoleInput);            
            System.out.println("\n\n>>>>>>Record found for '" + consoleInput + "'");

            for (Product product : result) {
                System.out.println(product);
            }               
        }           
    }
}

的hibernate.cfg.xml

<hibernate-configuration>
    <session-factory>

        <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:xe</property>
        <property name="hibernate.connection.username">vb</property>
        <property name="hibernate.connection.password">123456</property>
        <property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>
        <property name="show_sql">false</property>
        <property name="format_sql">true</property>

        <property name="hibernate.hbm2ddl.auto">update</property>

        <property name="hibernate.search.default.directory_provider">filesystem</property>
        <property name="hibernate.search.default.indexBase">C:\lucene\indexes</property>

        <mapping class="com.test.webservice.model.Product" />

    </session-factory>
</hibernate-configuration>

Product.java

@Entity
@Indexed
@Table(name = "PRODUCT")
public class Product {

    private String name;
    private long id;

    @Field(index = Index.YES, analyze = Analyze.YES, store = Store.NO)
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }


    public void setId(long id) {
        this.id = id;
    }

    @Id
    public long getId() {
        return id;
    }

}

Answer 1

错误消息是错误的，它应该是＆＃34; java.lang.Object不是索引实体的索引实体或超类＆＃34;。我created a ticket，我们会尽快修复错误消息。

关于您的问题，此异常意味着Object及其任何子类都未编入索引。简而言之，没有任何索引类。

我可以看到您的Product类已使用@Indexed注释，因此这可能意味着您在HibernateUtil中启动Hibernate ORM的方式存在问题。

您在session = HibernateUtil.getSession();中评论自己的行displayContactTableData()的简单事实让我觉得您已经知道了这一点。

您应该查看getting started guide以确保正确启动Hibernate ORM。

Answer 2

我遇到了同样的问题，我将导入从import org.springframework.stereotype.Indexed;更改为import org.hibernate.search.annotations.Indexed;，并且可以正常工作！

线程＆＃34; main＆＃34;中的例外情况java.lang.IllegalArgumentException：java.lang.Object不是索引实体或索引实体的子类

2 个答案: