Using PersistenceBroker store with inheritance mappings

[Matt Mastrangelo]

I'm having some trouble using the PersistenceBroker store method on an 
object mapped with a simple inheritance hierarchy.

Here's how my classes are configured:

public class Person
{
   private String oid;
   private String lastName;
   private String firstName;
   // (setters and getters....)
}
public class Student extends Person
{
   private String oid;
   private String grade;
   private String homeroom;
   // (setters and getters....)
}
<class-descriptor class="Person" table="PERSON">
  <field-descriptor name="oid" column="OID" jdbc-type="CHAR" 
primarykey="true" />
  <field-descriptor name="lastName" column="LAST_NAME" 
jdbc-type="VARCHAR" />
  <field-descriptor name="firstName" column="FIRST_NAME" 
jdbc-type="VARCHAR" />
</class-descriptor>
<class-descriptor class="Student" table="STUDENT">
  <field-descriptor name="oid" column="OID" jdbc-type="CHAR" 
primarykey="true" />
  <field-descriptor name="grade" column="GRADE" jdbc-type="VARCHAR" />
  <field-descriptor name="homeroom" column="HOMEROOM" 
jdbc-type="VARCHAR" />
  <reference-descriptor name="super" class-ref="Person" auto-update="true">
     <foreignkey field-ref="oid" />
  </reference-descriptor>
</class-descriptor>

If I insert values for the two tables into the database directly, I am 
able to query on the Student class successfully through OJB.  I can also 
update pre-existing objects using the store method.  When I try to 
create a new Student object, however, I get the following exception:

org.apache.ojb.broker.PersistenceBrokerException: assertValidPkFields 
failed for Object of type: Person on insert
   at 
org.apache.ojb.broker.core.PersistenceBrokerImpl.storeToDb(PersistenceBrokerImpl.java:1999)

It appears that OJB isn't assigning the oid to the new Person object.  
Am I missing something in my mapping?  Is it even possible to insert 
both the PERSON and STUDENT records at the same time by storing a new 
Student object?

Thanks for your help.

Matt



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