ojb and interface driven design

[Maksimenko Alexander]

hi!
it's wondering but I found out that  its difficult to use interface 
driven design with ojb ;(
lets consider a simple 2-table example:

interface User{Integer getId(),Group getGroup()},
class UserImpl implements User{private Integer id; private Group group; 
access methods}

interface Group{Integer getId(),User getManager()},
class GroupImpl implements Group{private Integer id;privarte User 
manager; access methods}

What repository descriptor should be to get correct results with the 
following query:

QueryByCriteria query = QueryFactory.newQuery(User.class,new Criteria());
query.getCriteria().addEqualTo("group.manager.id",new Integer(4));
Collection users = broker.getCollectionByQuery(query);
Standard approach in mapping is not working ;(
<class-descriptor 
	class="test.ojb.datamodel.User">
	<extent-class class-ref="test.ojb.datamodel.impl.UserImpl"/>
</class-descriptor>
<class-descriptor 
	class="test.ojb.datamodel.impl.UserImpl" 
	table="USER" 
	factory-class="test.ojb.datamodel.impl.FactoryImpl"
	factory-method="createUser">
	<field-descriptor 
		name="id" 
		column="ID" 
		jdbc-type="INTEGER"
		primarykey="true"
		nullable="false"
		autoincrement="true"
		access="readonly"/>	
	<field-descriptor 
		name="groupId"
		column="GROUP_ID"
		jdbc-type="INTEGER"
		access="anonymous"
	/>	
	<reference-descriptor
		name="group"
		class-ref="test.ojb.datamodel.Group"
		proxy="true"
	>
		<foreignkey field-ref="groupId"/>
	</reference-descriptor>	
</class-descriptor>

<class-descriptor 
	class="test.ojb.datamodel.Group">
	<extent-class class-ref="test.ojb.datamodel.impl.GroupImpl"/>
</class-descriptor>
<class-descriptor 
	class="test.ojb.datamodel.impl.GroupImpl" 
	table="GROUP1" 
	factory-class="test.ojb.datamodel.impl.FactoryImpl"
	factory-method="createGroup">
	<field-descriptor 
		name="id" 
		column="ID" 
		jdbc-type="INTEGER"
		primarykey="true"
		nullable="false"
		autoincrement="true"
		access="readonly"/>	
	<field-descriptor 
		name="managerId"
		column="MANAGER_ID"
		jdbc-type="INTEGER"
		access="anonymous"
	/>	
	<reference-descriptor
		name="manager"
		class-ref="test.ojb.datamodel.User"
		proxy="true"
	>
		<foreignkey field-ref="managerId"/>
	</reference-descriptor>	
</class-descriptor>


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