OneToMany lazy loading

[RamAESIS <rs...@hcl.in>]

Hi,

I am trying to lazy load a child collection in a one-to-many relationship as
shown below:

      @OneToMany(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
      @ElementJoinColumns({
           @ElementJoinColumn(name="ColA",referencedColumnName="ColX"),
           @ElementJoinColumn(name="ColB",referencedColumnName="ColY"),
           @ElementJoinColumn(name="ColC",referencedColumnName="ColZ")

      })
      public Collection<TableB> TableB_Obj = new HashSet<TableB>();

But after accessing the child collection  also it is still NULL, EAGER mode
works properly. Any guess or guidance in this issue is highly appreciated.
Thanks in advance.

Regards,
Ram

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Re: OneToMany lazy loading

[Simone Gianni <si...@apache.org>]

Hi Ram,
looking at your snippet, I see that you declared the field public. Are 
you then trying to access it using parent.TableB_Obj ? Cause in that 
case I don't think OpenJPA is able to catch your call and load the 
collection when needed. Try declaring the field private, creating a 
getter, and using the getter to access it. I use getters and lazy 
loading works correctly.

Hope this helps,

Simone

RamAESIS wrote:
> Hi,
>
> I am trying to lazy load a child collection in a one-to-many relationship as
> shown below:
>
>       @OneToMany(cascade=CascadeType.ALL,fetch=FetchType.LAZY)
>       @ElementJoinColumns({
>            @ElementJoinColumn(name="ColA",referencedColumnName="ColX"),
>            @ElementJoinColumn(name="ColB",referencedColumnName="ColY"),
>            @ElementJoinColumn(name="ColC",referencedColumnName="ColZ")
>
>       })
>       public Collection<TableB> TableB_Obj = new HashSet<TableB>();
>
> But after accessing the child collection  also it is still NULL, EAGER mode
> works properly. Any guess or guidance in this issue is highly appreciated.
> Thanks in advance.
>
> Regards,
> Ram
>
>   


-- 
Simone Gianni            CEO Semeru s.r.l.           Apache Committer
http://www.simonegianni.it/