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From "Mark Struberg (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (OPENJPA-2141) Lazy fetch of embedded attributes does not work properly
Date Thu, 26 Apr 2012 15:44:16 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-2141?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13262681#comment-13262681
] 

Mark Struberg commented on OPENJPA-2141:
----------------------------------------

Actually I found a bug which could be related to this.

I have an Entity (Course) with a simple @Embedded field and a @Lob. I do not use any LAZY
attribution on them! 


If I do a normal em.find, the entity will be loaded as a whole (all the fields, including
the embedded and the lob will be fetched immediately). 
Sidenote: the Lecturer referred in the select is defined as
    @OneToMany(mappedBy = "course",
            cascade = {CascadeType.PERSIST, CascadeType.REMOVE, CascadeType.MERGE},
            orphanRemoval = true, fetch = FetchType.EAGER)
    @OrderColumn(name = "POSITION")
    private List<Lecturer> lecturers;

The following selects DO work  
* "select c from Course c join c.lecturers l "
* "select distinct c from Course c"

The following selects create tons of subqueries! 1 separate sub-query for each @Embedded field,
and also for each @Lob

* "select distinct c from Course c join  c.lecturers l "
* "select distinct c from Lecturer l join l.course c"
* "select c from Lecturer l join l.course c"

Should I create a separate issue or do you think it's related?
                
> Lazy fetch of embedded attributes does not work properly
> --------------------------------------------------------
>
>                 Key: OPENJPA-2141
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-2141
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: jdbc
>    Affects Versions: 2.3.0, 2.2.1
>            Reporter: Jeremy Bauer
>            Assignee: Jeremy Bauer
>
> OpenJPA's @Persistent annotation and configuration via OpenJPA's xml extensions provide
a mechanism to mark embedded fields lazy.  When trying to use this facility I found a couple
bugs.
> Bug 1: The xml extension does not process the fetch attribute, so the field is never
marked lazy.
> Bug 2: If marked lazy via the annotation or xml (with a fix) the lazy field does not
get loaded along with the entity (as expected), but then will not load when accessed.

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