[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2392) LockModes referencing non-root joined-subclass class in HQL/Criteria

[Steve Ebersole (JIRA)]

LockModes referencing non-root joined-subclass class in HQL/Criteria 
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         Key: HHH-2392
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2392
     Project: Hibernate3
        Type: Bug

  Components: core  
 Environment: dialects supporting FOR UPDATE OF construct (Dialect.forUpdateOfColumns() == true)
    Reporter: Steve Ebersole
 Assigned to: Steve Ebersole 
     Fix For: 3.2.3


When setting a LockMode to an HQL or Criteria query where the lock applies to a non-root subclass in a joined-subclass hierarchy, the result is incorrect on dialects which support the FOR UPDATE OF construct.  The problem is that logically, the root table should be locked; however, the "driving" table is instead locked currently.

For example, consider:
              Person
                   |
         -----------------
         |                    |
Employee    Customer

For queries against Employee requesting that Employee be locked, the physical DB lock should actually be applied to the Person table!

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