Question

我想用hibernate-search-orm项目中的MassIndexer系统重新索引elasticsearch索引中的实体。

它可能很棒;）但它告诉我一些例外情况。

但是如下所示，示例是基本的：

实体：

@Entity
@Table(name = "STUDENT")
@Indexed
@ProvidedId (bridge = @FieldBridge(impl = StudentFieldBridge.class))
public class StudentEntity {

    @EmbeddedId
    private RegistrationId regid;

    @Field
    private String name;
    ...
}

registrationId：

@Embeddable
public class RegistrationId implements Serializable{

    @Column(name = "STUDENT_ID")
    private int studentId;

    @Column(name = "DEPARTMENT")
    private String department;
    ...
}

学生场桥：

public class StudentFieldBridge implements TwoWayStringBridge {

    @Override
    public Object stringToObject(String stringValue) {
        String[] split = stringValue.split("_");
        RegistrationId ret = new RegistrationId();
        ret.setDepartment(split[0]);
        ret.setStudentId(Integer.parseInt(split[1]));
        return ret;
    }

    @Override
    public String objectToString(Object object) {
        RegistrationId id = (RegistrationId) object;
        return id.getDepartment() + "_" + id.getStudentId();
    }
}

群众指数化

@Test
public void massIndexation() throws InterruptedException {
    EntityManager em = Persistence.createEntityManagerFactory("studentPu").createEntityManager();
    org.hibernate.Session hibernateSession = (Session)em.getDelegate();
    FullTextSession fullTextSession = Search.getFullTextSession(hibernateSession);
    fullTextSession.createIndexer().startAndWait();
}

最后是错误：

ERROR: HSEARCH000058: HSEARCH000212: An exception occurred while the MassIndexer was transforming identifiers to Lucene Documents
java.lang.NullPointerException
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getEntityName(CriteriaQueryTranslator.java:626)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getColumns(CriteriaQueryTranslator.java:509)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.findColumns(CriteriaQueryTranslator.java:525)
at org.hibernate.criterion.InExpression.toSqlString(InExpression.java:43)
at org.hibernate.loader.criteria.CriteriaQueryTranslator.getWhereCondition(CriteriaQueryTranslator.java:400)
at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:106)
at org.hibernate.loader.criteria.CriteriaJoinWalker.<init>(CriteriaJoinWalker.java:75)
at org.hibernate.loader.criteria.CriteriaLoader.<init>(CriteriaLoader.java:80)
at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1760)
at org.hibernate.internal.CriteriaImpl.list(CriteriaImpl.java:363)
at org.hibernate.search.batchindexing.impl.IdentifierConsumerDocumentProducer.loadList(IdentifierConsumerDocumentProducer.java:175)
at org.hibernate.search.batchindexing.impl.IdentifierConsumerDocumentProducer.loadAllFromQueue(IdentifierConsumerDocumentProducer.java:140)
at org.hibernate.search.batchindexing.impl.IdentifierConsumerDocumentProducer.run(IdentifierConsumerDocumentProducer.java:117)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:744)

java项目依赖项是：

testCompile group: 'org.hibernate', name: 'hibernate-entitymanager', version: '5.0.8.Final'
testCompile group: 'org.hibernate', name: 'hibernate-search-orm', version: '5.6.0.Alpha3'
testCompile group: 'org.hibernate', name: 'hibernate-search-backend-elasticsearch', version: '5.6.0.Alpha3'

感谢项目团队的工作！

Answer 1

这应该有效：

@Entity
@Table(name = "STUDENT")
@Indexed
public class StudentEntity {

    @EmbeddedId
    @DocumentId
    @FieldBridge(impl = StudentFieldBridge.class)
    private RegistrationId regid;

    @Field
    private String name;

问题是由@ProvidedId注释引起的，它与MassIndexer不兼容：它适用于与Hibernate Search集成的其他框架，以直接提供外部分配的ID。如果id是从外部分配的，则MassIndexer无法猜测它们，因此不应将它们一起使用。

我将尝试澄清ProvidedId关于此的文档，或者可能弃用/删除注释，因为我没想到它会导致这样一个令人困惑的错误。谢谢你的举报！

hibernate-search MassIndexer ERROR

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