Betr.: Re: [eclipselink-users] Strange persistence layer behaviour

[Willem Kunkels <Willem.Kunkels@xxxxxxxxxxxxxx>]

Well, the mappins have indeed been specified
on both sides of the relationship...the LetterOfCreditGoederenOmsRegel
entity contains the following:

    @ManyToOne(cascade=CascadeType.REFRESH,
fetch = FetchType.LAZY)
    @JoinColumns({
        @JoinColumn(name
= "LIVLG",
referencedColumnName = "LIVLG",
insertable = false,
updatable = false),
        @JoinColumn(name
= "IKONR",
referencedColumnName = "IKONR",
insertable = false,
updatable = false),
        @JoinColumn(name
= "IKRNR",
referencedColumnName = "IKRNR",
insertable = false,
updatable = false)
})
    private
LetterOfCreditGoederenOms goederenOms;

    public
LetterOfCreditGoederenOms getGoederenOms() {
        return
goederenOms;
    }

So, still puzzled by this..

Regards,

Willem Kunkels
Java Developer

Koopman International BV
Distelweg 88
1031 HH  Amsterdam
The Netherlands
Tel.: +31 20 494 7 893
www.koopmanint.com

James Sutherland <jamesssss@xxxxxxxxx>

26-08-2009 16:33

Antwoord a.u.b. aan
EclipseLink User Discussions <eclipselink-users@xxxxxxxxxxx>

Aan	eclipselink-users@xxxxxxxxxxx
Cc
Onderwerp	Re: [eclipselink-users] Strange persistence layer behaviour

This occurs because EclipseLink caches by default, and you seem to have
corrupted your objects in your cache.  Most likely when you created
these
objects, you set the 1-1 but did not add to the 1-m, you must always set
both sides of the relationship in JPA.  Even without caching, you
would
still be corrupting your EntityManager.

You should ensure you update both sides of the relationship.  You
could also
disable caching using the persistence.xml property,
"eclipselink.cache.shared.default"="false".



Clogs wrote:
> 
> Hi all,
> 
> I have come across something that I do not quite understand, maybe
someone 
> can shed a light...
> 
> Here is the situation:
> 
> The entity LetterOfCreditGoederenOms contains lines wich can be retrieved
> through the following mapping:
> 
>     @OneToMany(cascade=CascadeType.REFRESH, mappedBy = "goederenOms",
> fetch = FetchType.LAZY)
>     private Collection<LetterOfCreditGoederenOmsRegel>
regels;
> 
>     public Collection<LetterOfCreditGoederenOmsRegel>
getRegels() {
>         return regels;
>     }
> 
> I have a bean that contains logic to compare two objects and determine
> changes between the two. In one case I check whether I need to remove
> something from the database. If so, I do the following:
> 
>                    
omschrijving = getEm().find(LetterOfCreditGoederenOms.
> class, 
>                    
        new 
> LetterOfCreditGoederenOmsPK(omschrijving.getVolgnummerInkooporder(),
>                    
                omschrijving.getInkoopOrderNr(),
> omschrijving.getInkoopOrderRegelNummer()));
>                    
getRemovedObjects().add(omschrijving);
>                    
getRemovedObjects().addAll(omschrijving.getRegels());  
>  
> 
> What I would expect (now that the LetterOfCreditGoederenOms object
> 'omschrijving' is managed) is that the call to getRegels() will get
me the 
> lines associated with the omschrijving object. It does not do this.
> What I need to do to get this working is adding the following just
after 
> the find:
> 
>                    
    // A little note:
>                    
    // You would expect that the regels can be 
> retrieved by
>                    
    // calling the getRegels() method. For some reason 
> unknown,
>                    
    // the persistence layer does not do this. The 
> only way
>                    
    // to get the regels is a refresh of the object we 
> just
>                    
    // found: cascading refresh then does get the 
> regels...
>                    
    // weird...
>                    
    getEm().refresh(omschrijving);
> 
> Anyone's got an answer to this enigma?
> 
> Cheers,
> 
> Willem Kunkels
> Java Developer
> 
> Koopman International BV
> Distelweg 88
> 1031 HH  Amsterdam
> The Netherlands
> Tel.: +31 20 494 7 893
> www.koopmanint.com
> 
> 


-----
http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland
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