Issue
I've a batch program based on Spring batch. The item reader is reading data from a database and I'm using the class HibernateCursorItemReaderBuilder
in order to setup the reader . But Hibernate doesn't recognise the location of Entities, and throws an hibernate exception : QuerySyntaxException ( Instrument is not mapped)
The JPA Entities are definitely present in my project, otherwise the code would not compile.
After debugging I found out the following. SessionFactoryImpl has an object called MetamodelImpl. And the properties this object are not set. One of the properties is called entityPersisterMap. This is where all Entities are registred. The solution is to set the property metamodel on SessionFactoryImpl. But there is no such method.
@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
Solution
The solution is to use the annotation @EntityScan("path_to_entities"). Now the entities are found and the object MetamodelImpl is populated correctly.
Answered By - user2023141