春季批处理 HibernateCursorItemReaderBuilder 抛出 QuerySyntaxException

【问题标题】：spring batch HibernateCursorItemReaderBuilder throws QuerySyntaxException春季批处理 HibernateCursorItemReaderBuilder 抛出 QuerySyntaxException
【发布时间】：2020-07-28 19:52:45
【问题描述】：

我有一个基于 Spring 批处理的批处理程序。项目阅读器正在从数据库中读取数据，我正在使用 HibernateCursorItemReaderBuilder 类来设置阅读器。但是 Hibernate 不识别实体的位置，并抛出一个休眠异常：QuerySyntaxException (Instrument is not mapped)
JPA 实体肯定存在于我的项目中，否则代码将无法编译。

调试后发现如下。 SessionFactoryImpl 有一个名为 MetamodelImpl 的对象。并且未设置此对象的属性。其中一个属性称为 entityPersisterMap。这是所有实体注册的地方。解决方案是在 SessionFactoryImpl 上设置属性元模型。 但是没有这样的方法。

@Configuration
public class ItemReaderConfig {
    
    @Autowired
    EntityManagerFactory entityManagerFactory;
    
    @Bean
    public HibernateCursorItemReader<Instrument> hibernateCursorItemReader() {
        
        SessionFactory sessionFactory = entityManagerFactory.unwrap(SessionFactory.class);
        
        return new HibernateCursorItemReaderBuilder<Instrument>()
                .name("instrumentReader")
                .sessionFactory(sessionFactory)
                .entityClass(Instrument.class)
                .queryString("from Instrument instr order by name") 
                .build();
    }
}

    org.springframework.batch.item.ItemStreamException: Failed to initialize the reader
        at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:153) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.support.CompositeItemStream.open(CompositeItemStream.java:103) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.core.step.tasklet.TaskletStep.open(TaskletStep.java:311) ~[spring-batch-core-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.core.step.AbstractStep.execute(AbstractStep.java:205) [spring-batch-core-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.core.job.SimpleStepHandler.handleStep(SimpleStepHandler.java:148) [spring-batch-core-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.core.job.AbstractJob.handleStep(AbstractJob.java:410) [spring-batch-core-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.core.job.SimpleJob.doExecute(SimpleJob.java:136) [spring-batch-core-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.core.job.AbstractJob.execute(AbstractJob.java:319) [spring-batch-core-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.core.launch.support.SimpleJobLauncher$1.run(SimpleJobLauncher.java:147) [spring-batch-core-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.core.task.SyncTaskExecutor.execute(SyncTaskExecutor.java:50) [spring-core-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at org.springframework.batch.core.launch.support.SimpleJobLauncher.run(SimpleJobLauncher.java:140) [spring-batch-core-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
        at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
        at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
        at java.lang.reflect.Method.invoke(Method.java:564) ~[?:?]
        at org.springframework.aop.support.AopUtils.invokeJoinpointUsingReflection(AopUtils.java:344) [spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.invokeJoinpoint(ReflectiveMethodInvocation.java:198) [spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163) [spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at org.springframework.batch.core.configuration.annotation.SimpleBatchConfiguration$PassthruAdvice.invoke(SimpleBatchConfiguration.java:127) [spring-batch-core-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186) [spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:212) [spring-aop-5.2.5.RELEASE.jar:5.2.5.RELEASE]
        at com.sun.proxy.$Proxy75.run(Unknown Source) [?:?]
        at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.execute(JobLauncherCommandLineRunner.java:192) [spring-boot-autoconfigure-2.2.6.RELEASE.jar:2.2.6.RELEASE]
        at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.executeLocalJobs(JobLauncherCommandLineRunner.java:166) [spring-boot-autoconfigure-2.2.6.RELEASE.jar:2.2.6.RELEASE]
        at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.launchJobFromProperties(JobLauncherCommandLineRunner.java:153) [spring-boot-autoconfigure-2.2.6.RELEASE.jar:2.2.6.RELEASE]
        at org.springframework.boot.autoconfigure.batch.JobLauncherCommandLineRunner.run(JobLauncherCommandLineRunner.java:148) [spring-boot-autoconfigure-2.2.6.RELEASE.jar:2.2.6.RELEASE]
        at org.springframework.boot.SpringApplication.callRunner(SpringApplication.java:784) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
        at org.springframework.boot.SpringApplication.callRunners(SpringApplication.java:768) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:322) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
        at org.springframework.boot.SpringApplication.run(SpringApplication.java:1215) [spring-boot-2.2.6.RELEASE.jar:2.2.6.RELEASE]
        at com.chartinvestbatch.alphaVantageHistory.configuration.Application.main(Application.java:22) [classes/:?]
    Caused by: java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException: Instrument is not mapped [from Instrument instr order by name]
        at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:138) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:181) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.ExceptionConverterImpl.convert(ExceptionConverterImpl.java:188) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:725) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:113) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.springframework.batch.item.database.HibernateItemReaderHelper.createQuery(HibernateItemReaderHelper.java:165) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.database.HibernateItemReaderHelper.getForwardOnlyCursor(HibernateItemReaderHelper.java:123) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.database.HibernateCursorItemReader.doOpen(HibernateCursorItemReader.java:187) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:150) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        ... 31 more
    Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: Instrument is not mapped [from Instrument instr order by name]
        at org.hibernate.hql.internal.ast.QuerySyntaxException.generateQueryException(QuerySyntaxException.java:79) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.QueryException.wrapWithQueryString(QueryException.java:103) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:220) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:144) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:113) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:73) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:155) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:604) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:716) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:113) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.springframework.batch.item.database.HibernateItemReaderHelper.createQuery(HibernateItemReaderHelper.java:165) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.database.HibernateItemReaderHelper.getForwardOnlyCursor(HibernateItemReaderHelper.java:123) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.database.HibernateCursorItemReader.doOpen(HibernateCursorItemReader.java:187) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:150) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        ... 31 more
    Caused by: org.hibernate.hql.internal.ast.QuerySyntaxException: Instrument is not mapped
        at org.hibernate.hql.internal.ast.util.SessionFactoryHelper.requireClassPersister(SessionFactoryHelper.java:169) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.ast.tree.FromElementFactory.addFromElement(FromElementFactory.java:91) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.ast.tree.FromClause.addFromElement(FromClause.java:79) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.ast.HqlSqlWalker.createFromElement(HqlSqlWalker.java:331) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElement(HqlSqlBaseWalker.java:3704) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromElementList(HqlSqlBaseWalker.java:3593) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.fromClause(HqlSqlBaseWalker.java:724) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.query(HqlSqlBaseWalker.java:580) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.selectStatement(HqlSqlBaseWalker.java:317) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.antlr.HqlSqlBaseWalker.statement(HqlSqlBaseWalker.java:265) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.ast.QueryTranslatorImpl.analyze(QueryTranslatorImpl.java:272) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.ast.QueryTranslatorImpl.doCompile(QueryTranslatorImpl.java:192) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.hql.internal.ast.QueryTranslatorImpl.compile(QueryTranslatorImpl.java:144) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:113) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.engine.query.spi.HQLQueryPlan.<init>(HQLQueryPlan.java:73) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.engine.query.spi.QueryPlanCache.getHQLQueryPlan(QueryPlanCache.java:155) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.AbstractSharedSessionContract.getQueryPlan(AbstractSharedSessionContract.java:604) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:716) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.hibernate.internal.AbstractSharedSessionContract.createQuery(AbstractSharedSessionContract.java:113) ~[hibernate-core-5.4.12.Final.jar:5.4.12.Final]
        at org.springframework.batch.item.database.HibernateItemReaderHelper.createQuery(HibernateItemReaderHelper.java:165) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.database.HibernateItemReaderHelper.getForwardOnlyCursor(HibernateItemReaderHelper.java:123) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.database.HibernateCursorItemReader.doOpen(HibernateCursorItemReader.java:187) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        at org.springframework.batch.item.support.AbstractItemCountingItemStreamItemReader.open(AbstractItemCountingItemStreamItemReader.java:150) ~[spring-batch-infrastructure-4.2.1.RELEASE.jar:4.2.1.RELEASE]
        ... 31 more

【问题讨论】：

  • 您的Instrument 类是否可能需要实现 Comparable 或类似的东西，所以order by 将在您的 queryString() 中工作？我假设name 是 Instrument 的属性？
  • no...Instrument 没有实现 Comparable。删除 order by 子句时也会出现同样的异常。
  • Instrument 不是实体，根据错误消息。它编译的事实并不意味着实体在启动时被正确检测/加载。
  • @Entity 公共类 Instrument 扩展 BaseEntity { ... } 。如您所见...它是一个实体。

标签： spring hibernate spring-batch


【解决方案1】：

解决方法是使用注解@EntityScan("path_to_entities")。现在已找到实体，并且对象 MetamodelImpl 已正确填充。

【讨论】：

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