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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