[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5465) HQL left join fetch of an element collection following a left join fetch of a one-to-one relationship causes NullPointerException

[Andrew Tolopko (JIRA)]

HQL left join fetch of an element collection following a left join fetch of a one-to-one relationship causes NullPointerException
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                 Key: HHH-5465
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5465
             Project: Hibernate Core
          Issue Type: Bug
          Components: query-hql
    Affects Versions: 3.5.4
         Environment: Hibernate 3.5.4, Postgresql 8.4, Java 6
            Reporter: Andrew Tolopko
         Attachments: hibernate-left-fetch-join-element-collection.zip, log.txt

HQL queries of the form 
"from EntityA a left join fetch a.entityB b left join fetch b.items"
fail with a NullPointerExeption when EntityA and EntityB have a one-to-one (@OneToOne) relationship and EntityB.items is an element collection (@ElementCollection, aka collection of values).  

For comparison, the following HQL queries are all admissible (which intends to demonstrate that no particular clause of the the above HQL is incorrect):
"from EntityB b left join fetch b.items"
"from EntityA a left join fetch a.entityB"
"from EntityA a left join fetch a.entityB.items"
"from EntityA a left join fetch a.entityCs c left join fetch c.items" (where EntityA and EntityC have a one-to-many (@OneToMany) relationship, and EntityC.items is an element collection)

Test code is attached.  The log output along with thrown exception is attached as log.txt.


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