hibernate-issues

[Hibernate-issues] [Hibernate-JIRA] Created: (HHH-1751) Collection corruptly loaded when join fetching and scrolling (org.hibernate.impl.FetchingScrollableResultsImpl)

[Maarten W. (JIRA) <no...@at...>]

Collection corruptly loaded when join fetching and scrolling (org.hibernate.impl.FetchingScrollableResultsImpl)
---------------------------------------------------------------------------------------------------------------

         Key: HHH-1751
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1751
     Project: Hibernate3
        Type: Bug

  Components: core  
    Versions: 3.2.0.cr2    
    Reporter: Maarten Winkels
 Attachments: Child.java, HQLScrollFetchTest.java, Parent.java, ParentChild.hbm.xml

When scrolling a query that has a jon fetch on a collection (set), the collection is not loaded correctly. It appears that only the first item in the collection is correctly loaded.

Th attached tests show this behaviour, as well as a number of orderings in the query to show how the collection is corruptly loaded.

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[Hibernate-issues] [Hibernate-JIRA] Updated: (HHH-1751) Collection corruptly loaded when join fetching and scrolling (org.hibernate.impl.FetchingScrollableResultsImpl)

[Maarten W. (JIRA) <no...@at...>]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1751?page=all ]

Maarten Winkels updated HHH-1751:
---------------------------------

    Attachment: Child.java

> Collection corruptly loaded when join fetching and scrolling (org.hibernate.impl.FetchingScrollableResultsImpl)
> ---------------------------------------------------------------------------------------------------------------
>
>          Key: HHH-1751
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1751
>      Project: Hibernate3
>         Type: Bug

>   Components: core
>     Versions: 3.2.0.cr2
>     Reporter: Maarten Winkels
>  Attachments: Child.java, HQLScrollFetchTest.java, Parent.java, ParentChild.hbm.xml
>
>
> When scrolling a query that has a jon fetch on a collection (set), the collection is not loaded correctly. It appears that only the first item in the collection is correctly loaded.
> Th attached tests show this behaviour, as well as a number of orderings in the query to show how the collection is corruptly loaded.

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[Hibernate-issues] [Hibernate-JIRA] Updated: (HHH-1751) Collection corruptly loaded when join fetching and scrolling (org.hibernate.impl.FetchingScrollableResultsImpl)

[Maarten W. (JIRA) <no...@at...>]

     [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1751?page=all ]

Maarten Winkels updated HHH-1751:
---------------------------------

    Attachment: scroll-fetch-collection.patch

This patch seems to solve the problem. In short, it involves not ending the collection loading for collections that do not have the currently loaded entity as parent. Of course this rule can olny be invoked when a single entity is loaded, as the root entity with scrollable results.

> Collection corruptly loaded when join fetching and scrolling (org.hibernate.impl.FetchingScrollableResultsImpl)
> ---------------------------------------------------------------------------------------------------------------
>
>          Key: HHH-1751
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1751
>      Project: Hibernate3
>         Type: Bug

>   Components: core
>     Versions: 3.2.0.cr2
>     Reporter: Maarten Winkels
>  Attachments: Child.java, HQLScrollFetchTest.java, Parent.java, ParentChild.hbm.xml, scroll-fetch-collection.patch
>
>
> When scrolling a query that has a jon fetch on a collection (set), the collection is not loaded correctly. It appears that only the first item in the collection is correctly loaded.
> Th attached tests show this behaviour, as well as a number of orderings in the query to show how the collection is corruptly loaded.

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[Hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1751) Collection corruptly loaded when join fetching and scrolling (org.hibernate.impl.FetchingScrollableResultsImpl)

[Ingo J. (JIRA) <no...@at...>]

    [ http://opensource.atlassian.com/projects/hibernate/browse/HHH-1751?pa=
ge=3Dcomments#action_23306 ]=20

Ingo Jobling commented on HHH-1751:
-----------------------------------

I am confirming this bug.  Until this is fixed, I modified my HQL by removi=
ng the fetch join on "one to many" collection (resulting in n+1 selects).

This seems to be the same bug as HHH-1283 ScrollableResults JoinFetch don't=
 set child collection correctly=E3=80=80after the second parent object


> Collection corruptly loaded when join fetching and scrolling (org.hiberna=
te.impl.FetchingScrollableResultsImpl)
> -------------------------------------------------------------------------=
--------------------------------------
>
>          Key: HHH-1751
>          URL: http://opensource.atlassian.com/projects/hibernate/browse/H=
HH-1751
>      Project: Hibernate3
>         Type: Bug

>   Components: core
>     Versions: 3.2.0.cr2
>     Reporter: Maarten Winkels
>  Attachments: Child.java, HQLScrollFetchTest.java, Parent.java, ParentChi=
ld.hbm.xml, scroll-fetch-collection.patch
>
>
> When scrolling a query that has a jon fetch on a collection (set), the co=
llection is not loaded correctly. It appears that only the first item in th=
e collection is correctly loaded.
> Th attached tests show this behaviour, as well as a number of orderings i=
n the query to show how the collection is corruptly loaded.

--=20
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