Alina Ricciuti ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=61fb92a... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiMDBmMzA2ODQx... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16363?atlOrigin=eyJpIjoiMDBmMz... ) HHH-16363 ( https://hibernate.atlassian.net/browse/HHH-16363?atlOrigin=eyJpIjoiMDBmMz... ) OneToMany object properties not set when EmbeddedId and it holds an OneToOne relationship to itself ( https://hibernate.atlassian.net/browse/HHH-16363?atlOrigin=eyJpIjoiMDBmMz... ) Issue Type: Bug Affects Versions: 6.2.0.CR4 Assignee: Unassigned Created: 23/Mar/2023 04:55 AM Environment: Hibernate: 6.2.0.CR4 Postgresql: 11 Spring Data JPA: 3.0.3 Spring Boot: 3.0.4 JDK: Oracle OpenJDK 17.0.2 OS: Windows 11 Priority: Major Reporter: Alina Ricciuti ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=61fb92a... ) I have a migration issue from hibernate 5.4.32 to hibernate 6: the properties of one of my entities are not properly set. Please find below a simplified model that reproduces this issue. So, I have Elements and Tags, as presented in the attached diagram: * Elements have Tags in a relationship ManyToOne , fetch EAGER * Tags have composite identifiers * Tag may have a OneToOne relationship “linkedTag” My sample project is using Lombok / Spring Data : * Element: @Entity @Getter @Setter public class Element { @EmbeddedId private PkComposite id; @Column(name = "NAME") private String name; @ManyToOne(fetch = FetchType.EAGER, cascade = CascadeType.ALL) @JoinColumn(name = "ID_TAG") private Tag tag; } * Tag: @Entity @Getter @Setter public class Tag { @EmbeddedId private PkComposite id; private String name; @OneToMany(mappedBy = "tag", fetch = FetchType.EAGER) private List<Element> elements; @OneToOne(cascade = CascadeType.ALL) @JoinColumn(name = "ID_TAG_LINKED") private Tag linkedTag; } * The composite key: @Getter @Setter public class PkComposite implements Serializable { @Column(name = "ID") private Long id; public PkComposite withId(Long id) { this.id = id; return this; } } * The test class: @Test @Transactional public void issue3_name_not_filled() { // create some data Session session = entityManager.unwrap(Session.class); session.createNativeQuery("insert into TAG (id, NAME) values (100, 'NAME for TAG 100')").executeUpdate(); session.createNativeQuery("insert into ELEMENT (id, NAME, ID_TAG) values (200, 'NAME for ELEMENT 200', 100)").executeUpdate(); // move line to other item Element element200 = elementRepository.findById(new PkComposite().withId(200L)).orElse(null); Assertions.assertNotNull(element200); Assertions.assertNotNull(element200.getTag()); Assertions.assertNotNull(element200.getTag().getName(), "Tag name is null !"); } The test fails since the name property is not set on Element’s Tag. None of tag’s properties is set, except for its identifier. Few remarks: * the issue is reproduced whether the Element identifier is composite or simple (may be Long as example) * The OneToMany relationship to Element in Tag class may also be lazy - in my project it is actually LAZY with LazyCollection(LazyCollectionOption.FALSE) * If I remove the “linkedTag” the issue in no longer reproduced But if I set the “linkedTag“: @Test @Transactional public void issue3_tag_not_properly_set() { // create some data Session session = entityManager.unwrap(Session.class); session.createNativeQuery("insert into TAG (id, NAME) values (101, 'NAME for LINKED TAG 101')").executeUpdate(); session.createNativeQuery("insert into TAG (id, NAME, ID_TAG_LINKED) values (100, 'NAME for TAG 100', 101)").executeUpdate(); session.createNativeQuery("insert into ELEMENT (id, NAME, ID_TAG) values (200, 'NAME for ELEMENT 200', 100)").executeUpdate(); // move line to other item Element element200 = elementRepository.findById(new PkComposite().withId(200L)).orElse(null); Assertions.assertNotNull(element200); Assertions.assertNotNull(element200.getTag()); Assertions.assertNotNull(element200.getTag().getId()); Assertions.assertEquals(100L, element200.getTag().getId().getId(), "Tag is not the good one !"); Assertions.assertEquals("NAME for TAG 100", element200.getTag().getName(), "Tag properties are not good !"); } The Element’s Tag’s properties are set, but with wrong values, those of the linked Tag. I have attached the tests logs and if needed, I can also share my sample project. ( https://hibernate.atlassian.net/browse/HHH-16363#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16363#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#100219- sha1:0c2c9f2 )