Hibernate 6 JoinType.LEFT Not Working

So I just upgraded from Hibernate 5.6.7 to 6.2.7 with the upgrade to Springboot 3. I have gone through bunch of small changes that have needed to happen with the version just but I am having an issue with a few of my queries what are using JoinType.LEFT, that worked previously but now are not working.

When I look at the query that is being produced by the hibernate code, what used to produce a left outer join is now just producing a straight join.

Hibernate 5
from actions action0_ left outer join location location1_ on action0_.location=location1_.id 
    left outer join leads lead2_ on action0_.lead_id=lead2_.id 

Hibernate 6
from actions a1_0 join location l3_0 on l3_0.id=a1_0.location 
     join leads l4_0 on l4_0.id=a1_0.lead_id 

My entity structure and code didn’t change and the issue I am having with this, is I am not getting results when there is nothing to join to right now, and in this specific call, the action is tied to either a location or a lead, so I get no results now because 1 of them will always be null.

This is the code for the join (works in 5):

    from.join(Action_.location, JoinType.LEFT);
    from.join(Action_.lead, JoinType.LEFT);

This is the entity relationship:

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "location", referencedColumnName = "id")
    Location location;

    @ManyToOne(fetch = FetchType.LAZY)
    @JoinColumn(name = "lead_id", referencedColumnName = "id")
    Lead lead;

Maybe a change happened that I haven’t found yet that caused this problem, but any insight or help would be great.


Could be a bug, so please create an issue in the issue tracker(https://hibernate.atlassian.net) with a test case(https://github.com/hibernate/hibernate-test-case-templates/blob/master/orm/hibernate-orm-6/src/test/java/org/hibernate/bugs/JPAUnitTestCase.java) that reproduces the issue.

Thanks for the reply. I created a test case based on what you provided.

I provided the same code in Hibernate 5 and 6 and the results match the bug I am currently experiencing.

Trying to make an issue but wanted to let you know.

Created Ticket: [HHH-17042] - Hibernate JIRA

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