Re: help with non decomposed M:N

Armin,

That solved my problem. Thank you so much. I spent so much time on it I 
was about to give up.
Many thanks Armin.

Armin Waibel a écrit :
> Ramzi Oueslati wrote:
>> Hi Armin,
>>
>> Thank you for your reply. Sure I can and here it is.
>>
>> This is when I try to update an already persisted instance of A :
>>
>> java.lang.NullPointerException
>>    at 
>> org.apache.ojb.broker.metadata.DescriptorRepository.getDescriptorFor(DescriptorRepository.java:409) 
>>
>>    at 
>> org.apache.ojb.broker.core.MtoNBroker.getMtoNImplementor(MtoNBroker.java:129) 
>>
>
> Think I got your problem. The NPE is caused by a invalid mapping.
>
> Your look like:
>
> <collection-descriptor name="cs" 
> collection-class="org.apache.ojb.broker.util.collections.ManageableArrayList" 
>
>        element-class="my.test.business.C"
>        auto-retrieve="false" auto-update="link"
>        indirection-table="TBLAC">
>        <fk-pointing-to-this-class column="A_ID" />
>        <fk-pointing-to-element-class column="C_ID" />
> </collection-descriptor>
>
>
> a correct mapping look like:
>
> <collection-descriptor name="authors" 
> element-class-ref="org.apache.ojb.broker.sqlcount.BaseCountTest$Author"
>         indirection-table="SQLCOUNT_PUBLICATION"
>         proxy="true"
>         auto-retrieve="true"
>         auto-update="object"
>         auto-delete="object"
>         >
>         <fk-pointing-to-this-class column="MEDIUM_ID"/>
>         <fk-pointing-to-element-class column="AUTHOR_ID"/>
>     </collection-descriptor>
> </class-descriptor>
>
> as you can see it differs in one attribute, you use "element-class" 
> instead of "element-class-ref" and this cause the NPE.
>
> By the way, it's recommended to use the latest version of OJB (1.0.4).
>
> Good luck!
> regards,
> Armin
>
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