I wondered what this errormessage would mean:
"Atleast one role of a foreign-key mapped relationship must have key fields"
my ejb-jar.xml deploymentdesriptor is:
<ejb-relation-name>branche-gruppe</ejb-relation-name>
<ejb-relationship-role >
<ejb-relationship-role-name>gruppeRelationshipRole</ejb-relationship-role-name>
Many
<relationship-role-source >
<ejb-name>gruppe</ejb-name>
</relationship-role-source>
<cmr-field >
<cmr-field-name>branche</cmr-field-name>
</cmr-field>
</ejb-relationship-role>
<ejb-relationship-role >
<ejb-relationship-role-name>brancheRelationshipRole</ejb-relationship-role-name>
One
<relationship-role-source >
<ejb-name>branche</ejb-name>
</relationship-role-source>
<cmr-field >
<cmr-field-name>gruppen</cmr-field-name>
<cmr-field-type>java.util.Collection</cmr-field-type>
</cmr-field>
</ejb-relationship-role>
I have a 1:n Relationship, and I needed to add the following XDoclet to the
getBranche-Method in Gruppe, because the relatioship is
Gruppe(n) (field "branche") - Branche(1) (collection gruppen):
@jboss.relation fk-constraint = "yes"
related-pk-field = "id" (id of Branche)
fk-column = "branche"
this added the key fields in jbosscmp-jdbc.xml:
<ejb-relation>
<ejb-relation-name>branche-gruppe</ejb-relation-name>
<ejb-relationship-role>
<ejb-relationship-role-name>gruppeRelationshipRole</ejb-relationship-role-name>
<fk-constraint>yes</fk-constraint>
<key-fields/>
</ejb-relationship-role>
<ejb-relationship-role>
<ejb-relationship-role-name>brancheRelationshipRole</ejb-relationship-role-name>
<key-fields>
<key-field>
<field-name>id</field-name>
<column-name>branche</column-name>
</key-field>
</key-fields>
</ejb-relationship-role>
</ejb-relation>
