Inheritance: One Table

[Tino Schöllhorn]

Hi,
I have I inheritance-problem. I want to map two classes to one table. 
They are defined as followed:

class A {
        int id;
        protected String ojbConcreteClass;
        // some attributes      
}
class B extends A {
        // some additional attributes
}
I created class-descriptors for each of the table:
<class-descriptor class="A" table="table">
        // field-descriptors for A inluding ojbConcreteClass
</class>
and
<class-descriptor class="B" table="table" extends="A">
        // additional field-descriptors for B
</class>
So: When I try to store an instance of Type A everything is fine. But 
when I try to store an instance of Type B OJB complains:

Caused by: 
org.apache.ojb.broker.metadata.ClassNotPersistenceCapableException: OJB 
needs at least one primary key attribute for class 
objectsRealClass=class kos.wnetz.om.RelationHistoryEvent, 
objectTopLevelClass=class kos.wnetz.om.RelationHistoryEvent
	at org.apache.ojb.broker.Identity.checkForPrimaryKeys(Identity.java:245)
	at org.apache.ojb.broker.Identity.init(Identity.java:121)

So I also tried to include the field-descriptors of the superclass in 
the class-descriptor for class B. But then I get an even worse error:

Caused by: java.sql.SQLException: Parameter index out of range (8 > 7).
	at 
com.mysql.jdbc.PreparedStatement.setInternal(PreparedStatement.java:1940)
	at com.mysql.jdbc.PreparedStatement.setString(PreparedStatement.java:1075)
	at com.mysql.jdbc.PreparedStatement.setObject(PreparedStatement.java:766)
	at com.mysql.jdbc.PreparedStatement.setObject(PreparedStatement.java:892)
	at 
org.apache.ojb.broker.platforms.PlatformDefaultImpl.setObjectForStatement(PlatformDefaultImpl.java:227)
	at 
org.apache.ojb.broker.platforms.PlatformMySQLImpl.setObjectForStatement(PlatformMySQLImpl.java:87)
	at 
org.apache.ojb.broker.accesslayer.StatementManager.bindInsert(StatementManager.java:449)
	at 
org.apache.ojb.broker.accesslayer.JdbcAccessImpl.executeInsert(JdbcAccessImpl.java:193)
	... 47 more

So obviously I am missing somthing. do you have any suggestions?
Tino
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