[hibernate-issues] [Hibernate-JIRA] Created: (HHH-6361) Collection events may contain wrong stored snapshot after merging a detached entity into the persistencecontext

[Erik-Berndt Scheper (JIRA)]

Collection events may contain wrong stored snapshot after merging a detached entity into the persistencecontext
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                 Key: HHH-6361
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6361
             Project: Hibernate Core
          Issue Type: Bug
    Affects Versions: 3.6.5
            Reporter: Erik-Berndt Scheper
            Priority: Minor


After the merge process, driven by the {{DefaultMergeEventListener}}, it can happen that the Hibernate collection events contain references to an incorrect stored snapshot. This is both the case for the {{PersistentCollection}} and the {{CollectionEntry}}, as returned by {{session.getPersistenceContext().getCollectionEntry(persistentCollection)}}

By itself, this looks like a minor issue. However, this leads to severe problems when Envers is used. This bug causes HHH-6349, which results in inconsistent (invalid) audit trails and possibly AssertionFailures when the {{ValidityAuditStrategy}} is used. 

I am pretty sure the same bug exists in the 4.0.0 Betas, since I have an Envers testcase for testng (3.6 branch) and junit4 (master) which both exhibit the same behaviour. However, I haven't looked in the changes in the merge process in 4.0.0 betas (compared to 3.6.x).

I am currently preparing a testcase for the Hibernate testsuite (complimentary to the Envers testcases) together with a suggested fix, but this takes a bit more work than I anticipated.

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