Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNjlhZDZjMjk5... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16219?atlOrigin=eyJpIjoiNjlhZD... ) HHH-16219 ( https://hibernate.atlassian.net/browse/HHH-16219?atlOrigin=eyJpIjoiNjlhZD... ) Lazy loading of association involving loading of other, eager associations leads to unwanted loading beyond max_fetch_depth ( https://hibernate.atlassian.net/browse/HHH-16219?atlOrigin=eyJpIjoiNjlhZD... ) Issue Type: Bug Affects Versions: 6.2.0.CR2 Assignee: Unassigned Components: hibernate-core Created: 22/Feb/2023 08:59 AM Fix Versions: 6.2.0 Priority: Major Reporter: Yoann Rodière ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) With the following model: @Entity(name = "entitya") public static class EntityA { @Id private Integer id; @OneToOne private EntityB entityB1; @OneToOne private EntityB entityB2; // ... Getters, setters ... } @Entity(name = "entityb") public static class EntityB { @Id private Integer id; @OneToOne(mappedBy = "entityB1", fetch = FetchType.LAZY) private EntityA entityA1; @OneToOne(mappedBy = "entityB2", fetch = FetchType.LAZY) private EntityA entityA2; // ... Getters, setters ... } Assuming a max_fetch_depth of 1, calling EntityB.getEntityA1() will execute the following query: select e2_0.id,e3_0.id,e4_0.id,e5_0.id,e6_0.id,e7_0.id from entityb e1_0 left join entitya e2_0 on e1_0.id=e2_0.entityB1_id left join entityb e3_0 on e3_0.id=e2_0.entityB1_id left join entityb e4_0 on e4_0.id=e2_0.entityB2_id left join entitya e5_0 on e1_0.id=e5_0.entityB2_id left join entityb e6_0 on e6_0.id=e5_0.entityB1_id left join entityb e7_0 on e7_0.id=e5_0.entityB2_id where e1_0.id=? That’s 6 joins, but I would have expected at most three joins, one for the lazy association and two for the eager associations in EntityA. ( https://hibernate.atlassian.net/browse/HHH-16219#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16219#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- sha1:64a4cf6 )