MK ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=70121%3... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiZWEzYjBlNjNk... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16193?atlOrigin=eyJpIjoiZWEzYj... ) HHH-16193 ( https://hibernate.atlassian.net/browse/HHH-16193?atlOrigin=eyJpIjoiZWEzYj... ) LazyInitializationException when accessing loaded reference after session is closed using bytecode enhancement ( https://hibernate.atlassian.net/browse/HHH-16193?atlOrigin=eyJpIjoiZWEzYj... ) Issue Type: Bug Affects Versions: 6.2.0.CR2 Assignee: Unassigned Attachments: lazy-bytecode-enhancement-error.zip Components: hibernate-enhance-maven-plugin Created: 17/Feb/2023 06:00 AM Environment: The error occurs with 6.2.0.CR2 but not 6.1.7.Final. Priority: Major Reporter: MK ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=70121%3... ) A LazyInitializationException occurs when accessing a loaded ManyToOne reference after the session is closed using lazy initialization bytecode enhancement. It only happens in combination with second-level caching and batch size. Entities: @Entity @NamedQueries({ @NamedQuery(name = "PersonType.selectAll" , query = "SELECT a" + " FROM EntityA a" ), }) @Cacheable @Cache(usage = CacheConcurrencyStrategy.READ_WRITE) public class EntityA { @Id @GeneratedValue private Long id; private String name; @ManyToOne private EntityB entityB; } @Entity @BatchSize(size = 500) public class EntityB { @Id @GeneratedValue private Long id; private String name; } Test Code (entities are created beforehand): EntityManager entityManager = entityManagerFactory.createEntityManager(); entityManager.getTransaction().begin(); List<EntityA> aList = entityManager.createNamedQuery( "PersonType.selectAll" , EntityA.class) .getResultList(); entityManager.getTransaction().commit(); entityManager.close(); Assert.assertEquals(1, aList.size()); Assert.assertEquals( "B1" , aList.get(0).getEntityB().getName()); // LazyInitializationException Reproducer is attached! ( https://hibernate.atlassian.net/browse/HHH-16193#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16193#add-comment?atlOrigin=ey... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100216- sha1:3fa9804 )