# HS 6.0 Exception While Scrolling

**URL:** <https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019>\
**Category:** Hibernate Search\
**Created:** [February 4, 2021, 11:36pm UTC](https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019 "2021-02-04T23:36:10Z")\
**Posts on this page:** 8\
**Page:** 1

<div class="post-metadata">

**Author:** ![kmelkild](https://avatars.discourse-cdn.com/v4/letter/k/e79b87/32.png) [@kmelkild](https://discourse.hibernate.org/u/kmelkild)\
**Post date:** [February 4, 2021, 11:36pm UTC](https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019/1 "2021-02-04T23:36:10Z")

</div>

I’m encountering an exception trying to execute the following in HS 6.0. It makes a number of passes through the for loop before excepting out on line 512 (marked by comment). I don’t see a major delta between this and the scroll example in the documentation. If anyone can spot the issue or if this is a known HS6 bug I’d appreciate the heads up. Note. Using pagination on these these same classes works without issue. Thanks, Keith

Code snippet:

```auto
      List<PatentDocSearchResultDO> docResults = new ArrayList<>();
      PatentDocSearchResultListDO resultList = new PatentDocSearchResultListDO();
      try (
         SearchScroll<PatentDocSearchResultDO> scroll = Search.session(entityManager)
            .search(PatentDocDO.class).extension(LuceneExtension.get())
            .select(f -> f.composite(PatentDocSearchResultDO::new, f.score(), f.entity()))
            .where(f -> f.bool((b -> {
               addSearchClausesFromCriteria(f, b,criteria);
            })))
           .scroll(CHUNK_SIZE)) {        
            for (SearchScrollResult<PatentDocSearchResultDO> chunk = scroll.next();
                  chunk.hasHits(); chunk = scroll.next() ) { //This is line 512 in the exception
               for ( PatentDocSearchResultDO hit : chunk.hits() ) { 
                  docResults.add(hit);
               }
               resultList.setEstResultCount((int) chunk.total().hitCount());
            }
            resultList.setDocResults(docResults);
            highlightTitleDuringSearch(criteria, resultList.getDocResults());
            return resultList;
      }

```

Exception

```auto
[dispatcherServlet] ERROR 2021-02-04 17:31:44,995 [http-nio-8080-exec-5]
 org.apache.catalina.core.ContainerBase.[Tomcat].[localhost].[/].[dispatcherServlet]
   Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.QueryException: Unrecognized parameter label : ids_84; nested exception is java.lang.IllegalArgumentException: org.hibernate.QueryException: Unrecognized parameter label : ids_84] with root cause
org.hibernate.QueryException: Unrecognized parameter label : ids_84
        at org.hibernate.loader.hql.QueryLoader.getNamedParameterLocs(QueryLoader.java:619)
        at org.hibernate.loader.Loader.buildNamedParameterLocMap(Loader.java:1130)
        at org.hibernate.loader.Loader.createSubselects(Loader.java:1092)
        at org.hibernate.loader.Loader.processResultSet(Loader.java:1009)
        at org.hibernate.loader.Loader.doQuery(Loader.java:959)
        at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:349)
        at org.hibernate.loader.Loader.doList(Loader.java:2850)
        at org.hibernate.loader.Loader.doList(Loader.java:2832)
        at org.hibernate.loader.Loader.listIgnoreQueryCache(Loader.java:2664)
        at org.hibernate.loader.Loader.list(Loader.java:2659)
        at org.hibernate.loader.hql.QueryLoader.list(QueryLoader.java:506)
        at org.hibernate.hql.internal.ast.QueryTranslatorImpl.list(QueryTranslatorImpl.java:400)
        at org.hibernate.engine.query.spi.HQLQueryPlan.performList(HQLQueryPlan.java:219)
        at org.hibernate.internal.SessionImpl.list(SessionImpl.java:1414)
        at org.hibernate.query.internal.AbstractProducedQuery.doList(AbstractProducedQuery.java:1625)
        at org.hibernate.query.internal.AbstractProducedQuery.list(AbstractProducedQuery.java:1593)
        at org.hibernate.query.Query.getResultList(Query.java:165)
        at org.hibernate.query.criteria.internal.compile.CriteriaQueryTypeQueryAdapter.getResultList(CriteriaQueryTypeQueryAdapter.java:76)
        at org.hibernate.search.mapper.orm.search.loading.impl.HibernateOrmEntityIdEntityLoader.doLoadEntities(HibernateOrmEntityIdEntityLoader.java:144)
        at org.hibernate.search.mapper.orm.search.loading.impl.HibernateOrmEntityIdEntityLoader.loadBlocking(HibernateOrmEntityIdEntityLoader.java:69)
        at org.hibernate.search.engine.search.loading.spi.DefaultProjectionHitMapper.loadBlocking(DefaultProjectionHitMapper.java:49)
        at org.hibernate.search.backend.lucene.search.query.impl.LuceneLoadableSearchResult.loadBlocking(LuceneLoadableSearchResult.java:73)
        at org.hibernate.search.backend.lucene.search.query.impl.LuceneSearchScrollImpl.doNext(LuceneSearchScrollImpl.java:127)
        at org.hibernate.search.backend.lucene.search.query.impl.LuceneSearchScrollImpl.next(LuceneSearchScrollImpl.java:83)
        at org.hibernate.search.backend.lucene.search.query.impl.LuceneSearchScrollImpl.next(LuceneSearchScrollImpl.java:28)
        at com.propat.pas.db.core.PatentDocRepositoryImpl.findUsingCriteria(PatentDocRepositoryImpl.java:512)
        at com.propat.pas.db.core.PatentDocRepositoryImpl$$FastClassBySpringCGLIB$$d6bb6b84.invoke(<generated>)
        at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
        at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
        at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123)
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
        at com.propat.pas.db.core.PatentDocRepositoryImpl$$EnhancerBySpringCGLIB$$6db2add3.findUsingCriteria(<generated>)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.data.repository.core.support.RepositoryMethodInvoker$RepositoryFragmentMethodInvoker.lambda$new$0(RepositoryMethodInvoker.java:289)
        at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:137)
        at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:121)
        at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:524)
        at org.springframework.data.repository.core.support.RepositoryComposition.invoke(RepositoryComposition.java:285)
        at org.springframework.data.repository.core.support.RepositoryFactorySupport$ImplementationMethodExecutionInterceptor.invoke(RepositoryFactorySupport.java:531)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.doInvoke(QueryExecutorMethodInterceptor.java:156)
        at org.springframework.data.repository.core.support.QueryExecutorMethodInterceptor.invoke(QueryExecutorMethodInterceptor.java:131)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.transaction.interceptor.TransactionInterceptor$1.proceedWithInvocation(TransactionInterceptor.java:123)
        at org.springframework.transaction.interceptor.TransactionAspectSupport.invokeWithinTransaction(TransactionAspectSupport.java:388)
        at org.springframework.transaction.interceptor.TransactionInterceptor.invoke(TransactionInterceptor.java:119)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.dao.support.PersistenceExceptionTranslationInterceptor.invoke(PersistenceExceptionTranslationInterceptor.java:137)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.data.jpa.repository.support.CrudMethodMetadataPostProcessor$CrudMethodMetadataPopulatingMethodInterceptor.invoke(CrudMethodMetadataPostProcessor.java:174)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.interceptor.ExposeInvocationInterceptor.invoke(ExposeInvocationInterceptor.java:97)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.framework.JdkDynamicAopProxy.invoke(JdkDynamicAopProxy.java:215)
        at com.sun.proxy.$Proxy217.findUsingCriteria(Unknown Source)
        at com.propat.pas.svc.core.PatentDocService.searchPatentDocs(PatentDocService.java:111)
        at com.propat.pas.svc.core.PatentDocService.serviceSearchPatentDocs(PatentDocService.java:190)
        at com.propat.pas.svc.core.PatentDocService$$FastClassBySpringCGLIB$$ed98a44f.invoke(<generated>)
        at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:687)
        at com.propat.pas.svc.core.PatentDocService$$EnhancerBySpringCGLIB$$f6a2af14.serviceSearchPatentDocs(<generated>)
        at com.propat.pas.mvc.search.PatentDocController.searchScoredSubmit(PatentDocController.java:584)
        at com.propat.pas.mvc.search.PatentDocController$$FastClassBySpringCGLIB$$6ef63c51.invoke(<generated>)
        at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:218)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint(CglibAopProxy.java:771)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:163)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
        at org.springframework.security.access.intercept.aopalliance.MethodSecurityInterceptor.invoke(MethodSecurityInterceptor.java:61)
        at org.springframework.aop.framework.ReflectiveMethodInvocation.proceed(ReflectiveMethodInvocation.java:186)
        at org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.proceed(CglibAopProxy.java:749)
        at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:691)
        at com.propat.pas.mvc.search.PatentDocController$$EnhancerBySpringCGLIB$$1158624e.searchScoredSubmit(<generated>)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
        at java.lang.reflect.Method.invoke(Unknown Source)
        at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:197)
        at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:141)
        at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:106)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:894)
        at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:808)
        at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87)
        at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:1061)
        at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:961)
        at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:1006)
        at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:898)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:645)
        at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:883)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:750)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.AbstractRequestLoggingFilter.doFilterInternal(AbstractRequestLoggingFilter.java:289)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.AbstractRequestLoggingFilter.doFilterInternal(AbstractRequestLoggingFilter.java:289)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:327)
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:115)
        at org.springframework.security.web.access.intercept.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:81)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:119)
        at org.springframework.security.web.access.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:113)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:126)
        at org.springframework.security.web.session.SessionManagementFilter.doFilter(SessionManagementFilter.java:81)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.authentication.AnonymousAuthenticationFilter.doFilter(AnonymousAuthenticationFilter.java:105)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.servletapi.SecurityContextHolderAwareRequestFilter.doFilter(SecurityContextHolderAwareRequestFilter.java:149)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.savedrequest.RequestCacheAwareFilter.doFilter(RequestCacheAwareFilter.java:63)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:218)
        at org.springframework.security.web.authentication.AbstractAuthenticationProcessingFilter.doFilter(AbstractAuthenticationProcessingFilter.java:212)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:103)
        at org.springframework.security.web.authentication.logout.LogoutFilter.doFilter(LogoutFilter.java:89)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.csrf.CsrfFilter.doFilterInternal(CsrfFilter.java:115)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.header.HeaderWriterFilter.doHeadersAfter(HeaderWriterFilter.java:90)
        at org.springframework.security.web.header.HeaderWriterFilter.doFilterInternal(HeaderWriterFilter.java:75)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:110)
        at org.springframework.security.web.context.SecurityContextPersistenceFilter.doFilter(SecurityContextPersistenceFilter.java:80)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.context.request.async.WebAsyncManagerIntegrationFilter.doFilterInternal(WebAsyncManagerIntegrationFilter.java:55)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
        at org.springframework.security.web.FilterChainProxy$VirtualFilterChain.doFilter(FilterChainProxy.java:336)
        at org.springframework.security.web.FilterChainProxy.doFilterInternal(FilterChainProxy.java:211)
        at org.springframework.security.web.FilterChainProxy.doFilter(FilterChainProxy.java:183)
        at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:358)
        at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:271)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:100)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.FormContentFilter.doFilterInternal(FormContentFilter.java:93)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:93)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201)
        at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:202)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:97)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:542)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:143)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:92)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:78)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:343)
        at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:374)
        at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:65)
        at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:888)
        at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1597)
        at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.lang.Thread.run(Unknown Source)

```

---

<div class="post-metadata">

**Author:** ![yrodiere](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/yrodiere/32/1760_2.png) [@yrodiere](https://discourse.hibernate.org/u/yrodiere)\
**Post date:** [February 5, 2021, 7:37am UTC](https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019/2 "2021-02-05T07:37:21Z")

</div>

First, I see you’re essentially retrieving the whole result list and storing everything in the same list. Scrolling won’t help you much here: it’s supposed to help you process data in chunks, releasing memory after each chunk, which you’re obviously not doing here.  
I’d suggest using `.fetchAllHits()` instead of `scroll()` if your intent really is to fetch the whole result list. Whatever approach you choose, be warned that you may hit an `OutOfMemoryError` if your dataset is too large.

Now about the exception… it definitely looks like a bug. I’m investigating and will update you.

---

<div class="post-metadata">

**Author:** ![yrodiere](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/yrodiere/32/1760_2.png) [@yrodiere](https://discourse.hibernate.org/u/yrodiere)\
**Post date:** [February 5, 2021, 11:35am UTC](https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019/3 "2021-02-05T11:35:22Z")

</div>

I confirm it is a bug: [[HSEARCH-4150] Entity loading fails when using FetchMode.SUBSELECT - Hibernate JIRA](https://hibernate.atlassian.net/browse/HSEARCH-4150)

I’ll try to come up with a fix ASAP.

---

<div class="post-metadata">

**Author:** ![yrodiere](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/yrodiere/32/1760_2.png) [@yrodiere](https://discourse.hibernate.org/u/yrodiere)\
**Post date:** [February 5, 2021, 12:26pm UTC](https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019/4 "2021-02-05T12:26:55Z")

</div>

I have a fix, I’ll try to release it soon.

In the meantime, as a workaround, you can set the fetch size to at least `CHUNK_SIZE`, e.g.:

```java
      List<PatentDocSearchResultDO> docResults = new ArrayList<>();
      PatentDocSearchResultListDO resultList = new PatentDocSearchResultListDO();
      try (
         SearchScroll<PatentDocSearchResultDO> scroll = Search.session(entityManager)
            .search(PatentDocDO.class).extension(LuceneExtension.get())
            .select(f -> f.composite(PatentDocSearchResultDO::new, f.score(), f.entity()))
            .where(f -> f.bool((b -> {
               addSearchClausesFromCriteria(f, b,criteria);
            })))
           .loading(o -> o.fetchSize(CHUNK_SIZE)) // ADD THIS
           .scroll(CHUNK_SIZE)) {
...

```

See also [this section of the documentation](https://docs.jboss.org/hibernate/stable/search/reference/en-US/html_single/#search-dsl-query-fetch-size).

---

<div class="post-metadata">

**Author:** ![kmelkild](https://avatars.discourse-cdn.com/v4/letter/k/e79b87/32.png) [@kmelkild](https://discourse.hibernate.org/u/kmelkild)\
**Post date:** [February 5, 2021, 2:21pm UTC](https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019/5 "2021-02-05T14:21:11Z")

</div>

Thanks for the workaround. Yeah, what you have in the code I submitted is an incomplete example of what I am porting. I have cases in which some of our services may need to operate on upwards of 25K docs at a time. In HS 5.5 I found that fetching that many docs in one shot to be extremely slow (this is all likelihood an artifact of Hibernate and not HS). So, instead I have a method implemented that returns the whole list, but pages in a chunk at a time internally to build the result set (limited to 25K). That sped things up dramatically. Once I saw HS 6 had this scrolling support, it occurred to me I can do that same thing without the downsides of paging, so I started implementing that when I ran into this issue. In the end, the final implementation will limit the max documents I scroll through. Having said all of this I should go back and test the performance of the one shot query again to see if I am still seeing the same behavior. Thanks again.

---

<div class="post-metadata">

**Author:** ![yrodiere](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/yrodiere/32/1760_2.png) [@yrodiere](https://discourse.hibernate.org/u/yrodiere)\
**Post date:** [February 5, 2021, 2:24pm UTC](https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019/6 "2021-02-05T14:24:31Z")

</div>

> [@kmelkild](#):
>
> Having said all of this I should go back and test the performance of the one shot query again to see if I am still seeing the same behavior

Definitely: the “fetch size” I was referring to does exactly what you want, i.e. it breaks down ORM entity loading into multiple query executions, by default 100 elements at a time. Even for “normal” (non-scrolling) fetches.

Though of course that won’t work in your case until [[HSEARCH-4150] - Hibernate JIRA](https://hibernate.atlassian.net/browse/HSEARCH-4150) gets fixed 🙂

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<div class="post-metadata">

**Author:** ![yrodiere](https://yyz1.discourse-cdn.com/flex035/user_avatar/discourse.hibernate.org/yrodiere/32/1760_2.png) [@yrodiere](https://discourse.hibernate.org/u/yrodiere)\
**Post date:** [February 11, 2021, 7:37am UTC](https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019/7 "2021-02-11T07:37:57Z")

</div>

For anyone else having this problem: this [was fixed in 6.0.1.Final](https://in.relation.to/2021/02/09/hibernate-search-6-0-1-Final/).

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<div class="post-metadata">

**Author:** ![kmelkild](https://avatars.discourse-cdn.com/v4/letter/k/e79b87/32.png) [@kmelkild](https://discourse.hibernate.org/u/kmelkild)\
**Post date:** [February 12, 2021, 3:15am UTC](https://discourse.hibernate.org/t/hs-6-0-exception-while-scrolling/5019/8 "2021-02-12T03:15:26Z")

</div>

Excellent. I will upgrade tomorrow. Thanks for the update!