[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3229) Make cascade rules more transparent/explicit/deterministic

[Gail Badner (JIRA)]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-3229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_30408 ] 

Gail Badner commented on HHH-3229:
----------------------------------

The fix involved a change to how merge is done so that the order of property cascades no longer affects merged results.

The other option was to document how the cascade order was determined and how the order affected merging a detached entity. Since this is no longer relevant, the documentation was not updated.

> Make cascade rules more transparent/explicit/deterministic
> ----------------------------------------------------------
>
>                 Key: HHH-3229
>                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3229
>             Project: Hibernate3
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 3.2.4.sp1, 3.2.5, 3.2.6
>            Reporter: Chris Bredesen
>            Assignee: Gail Badner
>             Fix For: 3.2.x, 3.3.0.CR2
>
>
> Cascade rules are prone to different behavior based on the order in which properties appear in mapping XML.  It is possible that an unexpected TransientObjectException may arise from certain operations when an object graph with circular references is merged (and possibly persisted/updated, etc).
> For example, if a transient instance is reachable through more than once path from a root entity, it is not clear whether operations will be cascaded to it.  The order in which the properties are mapped plays a part in determining cascade paths, but the rules are not documented. 
> Possible resolutions include:
> 1. Documenting the rules so that a programmer can make educated decisions about mapping.
> 2. Enhancing the algorithm such that order no longer matters and the rules are deterministic. 
> 3. ???

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