KevinT ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiMjljMWQ2NTcy... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16225?atlOrigin=eyJpIjoiMjljMW... ) HHH-16225 ( https://hibernate.atlassian.net/browse/HHH-16225?atlOrigin=eyJpIjoiMjljMW... ) Lazy-loading with parallel stream in a separate thread leads to exception with Hibernate 6 ( https://hibernate.atlassian.net/browse/HHH-16225?atlOrigin=eyJpIjoiMjljMW... ) Issue Type: Bug Affects Versions: 6.1.7 Assignee: Unassigned Attachments: hibernate-lazy-loading-async.zip Created: 23/Feb/2023 06:40 AM Priority: Major Reporter: KevinT ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) I have migrated from Hibernate 5 to Hibernate 6, and facing an issue while accessing an attribute lazy-loaded via a combination of ForkJoinPool and parallel stream. I have attached a project to reproduce the issue, just launch org.hibernate.bugs.JPAUnitTestCase#test. Basically, my data model is the following: @Entity @AllArgsConstructor @NoArgsConstructor @Data @EqualsAndHashCode(onlyExplicitlyIncluded = true ) @ToString(onlyExplicitlyIncluded = true ) public class RiskScenario { @Id @GeneratedValue @ToString.Include private Long id; @EqualsAndHashCode.Include @Setter(AccessLevel.PRIVATE) private UUID uuid = UUID.randomUUID(); @ToString.Include private String name; @OneToMany(cascade = ALL, fetch = FetchType.LAZY, mappedBy = "riskScenario" , orphanRemoval = true ) private Set<Treatment> treatments = new HashSet<>(); public void addTreatment(Treatment treatment) { if (treatments == null ) { treatments = new HashSet<>(); } treatments.add(treatment); treatment.setRiskScenario( this ); } } @Entity @AllArgsConstructor @NoArgsConstructor @Data @EqualsAndHashCode(onlyExplicitlyIncluded = true ) @ToString(onlyExplicitlyIncluded = true ) public class SecurityMeasure { @Id @GeneratedValue @ToString.Include private Long id; @EqualsAndHashCode.Include @Setter(AccessLevel.PRIVATE) private UUID uuid = UUID.randomUUID(); @ToString.Include private String name; @OneToMany(cascade = ALL, fetch = FetchType.LAZY, mappedBy = "securityMeasure" , orphanRemoval = true ) private Set<Treatment> treatments = new HashSet<>(); public void addTreatment(Treatment treatment) { if (treatments == null ) { treatments = new HashSet<>(); } treatments.add(treatment); treatment.setSecurityMeasure( this ); } } @Entity @AllArgsConstructor @NoArgsConstructor @Data @EqualsAndHashCode(onlyExplicitlyIncluded = true ) @ToString(onlyExplicitlyIncluded = true ) public class Treatment { @Id @GeneratedValue @ToString.Include private Long id; @EqualsAndHashCode.Include @Setter(AccessLevel.PRIVATE) private UUID uuid = UUID.randomUUID(); @ToString.Include private String name; @ManyToOne(cascade = {PERSIST, MERGE}, optional = false ) @JoinColumn(name = "risk_scenario_id" ) @ToString.Include private RiskScenario riskScenario; @ManyToOne(cascade = {PERSIST, MERGE}, optional = false ) @JoinColumn(name = "security_measure_id" ) @ToString.Include private SecurityMeasure securityMeasure; } The test itself that you can find in the project is as followed: @Test public void test() { entityManager.getTransaction().begin(); SecurityMeasure firstMeasureRefreshed = entityManager.find(SecurityMeasure.class, this.firstMeasure.getId()); SecurityMeasure secondMeasureRefreshed = entityManager.find(SecurityMeasure.class, this.secondMeasure.getId()); forkJoinPool .submit(() -> List.of(firstMeasureRefreshed, secondMeasureRefreshed) .parallelStream() .map(SecurityMeasure::getTreatments) .flatMap(Collection::stream) .map(Treatment::getRiskScenario) .collect(Collectors.toList())) .join(); entityManager.getTransaction().commit(); } The tricky part is that the error thrown by the test is somehow random: * Sometimes the test succeeds (but it is quite a rare case) * Sometimes the test fails with the below exception: java.util.NoSuchElementException : java.util.NoSuchElementException at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480) at java.base/java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:562) at java.base/java.util.concurrent.ForkJoinTask.reportException(ForkJoinTask.java:591) at java.base/java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:672) at org.hibernate.bugs.JPAUnitTestCase.test(JPAUnitTestCase.java:93) Caused by: java.util.NoSuchElementException at java.base/java.util.ArrayDeque.removeFirst(ArrayDeque.java:362) at org.hibernate.internal.util.collections.StandardStack.pop(StandardStack.java:54) at org.hibernate.sql.results.spi.LoadContexts.deregister(LoadContexts.java:45) at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:207) at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:33) at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.doExecuteQuery(JdbcSelectExecutorStandardImpl.java:443) at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.executeQuery(JdbcSelectExecutorStandardImpl.java:166) at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.list(JdbcSelectExecutorStandardImpl.java:91) at org.hibernate.sql.exec.spi.JdbcSelectExecutor.list(JdbcSelectExecutor.java:31) * Sometimes the test fails with the below exception (and this case is the one I managed to reproduce more often): java.lang.IllegalStateException: java.lang.IllegalStateException: Illegal pop() with non-matching JdbcValuesSourceProcessingState at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at java.base/jdk.internal.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:77) at java.base/jdk.internal.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.base/java.lang.reflect.Constructor.newInstanceWithCaller(Constructor.java:499) at java.base/java.lang.reflect.Constructor.newInstance(Constructor.java:480) at java.base/java.util.concurrent.ForkJoinTask.getThrowableException(ForkJoinTask.java:562) at java.base/java.util.concurrent.ForkJoinTask.reportException(ForkJoinTask.java:591) at java.base/java.util.concurrent.ForkJoinTask.join(ForkJoinTask.java:672) at org.hibernate.bugs.JPAUnitTestCase.test(JPAUnitTestCase.java:93) Caused by: java.lang.IllegalStateException: Illegal pop() with non-matching JdbcValuesSourceProcessingState at org.hibernate.sql.results.spi.LoadContexts.deregister(LoadContexts.java:47) at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:207) at org.hibernate.sql.results.spi.ListResultsConsumer.consume(ListResultsConsumer.java:33) at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.doExecuteQuery(JdbcSelectExecutorStandardImpl.java:443) at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.executeQuery(JdbcSelectExecutorStandardImpl.java:166) at org.hibernate.sql.exec.internal.JdbcSelectExecutorStandardImpl.list(JdbcSelectExecutorStandardImpl.java:91) at org.hibernate.sql.exec.spi.JdbcSelectExecutor.list(JdbcSelectExecutor.java:31) ( https://hibernate.atlassian.net/browse/HHH-16225#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16225#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! 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