Just getting to know Hibernate, experiencing information overload... been going trough docs and forums without finding answer. I am sure this has been dealth with before, my apologies for not been able to find it (:

Hibernate 2.1
Oracle8

-- Tables --

ORDER
orderid PK
description

ORDER_DETAIL
orderid PK FK
userid PK
progress
assigneddate


For simplicity, assume all colums varchar.


-- order.hbm.xml --


<hibernate-mapping auto-import="false">
<class name="Order" table="ORDER">
<id name="orderid" column="orderid" type="string">
<generator class="assigned"/>
</id>
<property name="description"/>
<set name="details">
<key column="orderid" />
<one-to-many class="OrderDetail"/>
</set >
</class>
</hibernate-mapping>


-- orderdetail.hbm.xml --

<hibernate-mapping>
<class name="OrderDetail" table="ORDER_DETAIL">
<composite-id name="compID" class="OrderDetailCompId">
<key-many-to-one name="orderid" class="Order" column="orderid" />
<key-property name="userid" column="userid"/>
</composite-id>
<property name="progress"/>
<property name="assignedDate"/>
</class>
</hibernate-mapping>


I'd like to keep the question short - please take it for granted that my classes have all properties, getters and setters, OrderDetailCompId has implemented equals() and hashCode() (and implements Serializable).

I get the exception below, when running the following code - just trying to create a record in ORDER_DETAIL:

sessionFactory = new Configuration().configure().buildSessionFactory();
session = sessionFactory.openSession();
Transaction tx = session.beginTransaction();
session.save(new OrderDetail("order1", "user99", "", "");
tx.commit();
session.close();


[ERROR] SessionImpl - -Could not synchronize database state with session <net.sf.hibernate.MappingException: No persister for: java.lang.String>net.sf.hibernate.MappingException: No persister for: java.lang.String
at net.sf.hibernate.impl.SessionFactoryImpl.getPersister(SessionFactoryImpl.java:344)
at net.sf.hibernate.impl.SessionImpl.getClassPersister(SessionImpl.java:2656)
at net.sf.hibernate.impl.SessionImpl.getPersister(SessionImpl.java:2663)
at net.sf.hibernate.impl.SessionImpl.getEntityIdentifierIfNotUnsaved(SessionImpl.java:2725)
at net.sf.hibernate.type.EntityType.getIdentifier(EntityType.java:66)
at net.sf.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:46)
at net.sf.hibernate.type.ComponentType.nullSafeSet(ComponentType.java:154)
at net.sf.hibernate.persister.EntityPersister.dehydrate(EntityPersister.java:399)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:466)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:442)
at net.sf.hibernate.impl.ScheduledInsertion.execute(ScheduledInsertion.java:29)
at net.sf.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:2382)
at net.sf.hibernate.impl.SessionImpl.execute(SessionImpl.java:2335)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2204)
at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)

I've been debugging - Hibernate is trying to persist Object with value "order1".

Now, I realize that attempting to persist a STRING is bad and indicates bad mapping or associations since STRING is not an entity.
What have I messed up - the composite key, mappings? Not enough specified?
Any help appreciated.

TIA

Hm, the mapping looks allright to me ... Probably you adding a string to some collection where a persistent object should be? The log should give you more info on where this string comes from.

Thanks, but I thing there has got to be something in the mapping though, I
enabled debug and this is what I noticed (mapping for class OrderItem):


...
[DEBUG] Binder - -Mapped property: orderid -> orderid, type: Order
...

Should have been java.lang.String.

Do you think the "many-to-one" mapping is still OK (see first post):



Thanks

Ah, that should look like this:



and you OrderDetailCompId should look like this:



Relationships are allways made with Object references, never with storing the key of the related object in a property.

Right on :



I had declared orderid as String in OrderDetailCompId, naturaly the getters and setters were "stringified" as well.

Changed the type to Order and it worked.

I should have posted the code, instead of that "take it for granted ..." crap.

Thanks again