I am running into exception when I use following one-to-many mapping using Hibernate. I need favor in this one-to-many mapping when the child has composite key in it.

My java classes are as follows:

public class Order
{
int orderId; //PK
Set orderLineItem;
......
}

public java OrderLineItemPK
{
int lineNo;
int orderId;
}

public java OrderLineItem
{
OrderLineItemPK pk;
String desc;
......
}

In the OrderLineItem class OrderLineItemPK will be the composite key and for this purpose I am using OrderLineItemPK.

Also the relationship between Order and OrderLineItem is one to many and unidirectional.

My mapping files are as follows:

Order.hbm.xml
==========

<hibernate-mapping>
<class
name="com.XXX.Order" table="Order">
<id name="orderId" type="int" unsaved-value="null">
<column name="ORDER_ID" sql-type="number(10)" not-null="true"/>
<generator class="increment"></generator>
</id>

<set name="theBookingLineItems"
table="ORDER_LINE_ITEM"
lazy="false"
inverse="false"
cascade="all"
sort="unsorted">
<key
column="ORDER_ID"
/>
<one-to-many
class="com.XXX.OrderLineItem"
/>
</set>
</hibernate-mapping>

OrderLineItem.hbm.xml
===============

<hibernate-mapping>
<class name="com.XXX.OrderLineItem" table="ORDER_LINE_ITEM">
<composite-id
name="orderLineItemPK"
class="com.xxx.OrderLineItemPK" >
<key-property name="orderId" column="ORDER_ID" type="integer" />
<key-property name="lineNo" column="LI_NUM" type="integer"/>
</composite-id>

</hibernate-mapping>


Now in my java program I call save() on the order object as follows:

//######
sess.save(order);
sess.flush();
//######

But it just saves the Order record in the table. The Order line item never saves.

Can some one help me in handling this kind of situation where I use composite key in the child object? Issue here may be I am using one of the fields of the composite key in the mapping of Set of the Parent object.

FYI: I am using hibernate-2.1 version.

Thank in advance. ANy help will be appreciated.

regards,
Naga

Read this, it may help you

http://www.hibernate.org/hib_docs/refer ... child.html

Here the issue is dealing with PK fields of the child. If some one can give pointers about that, it will be great.

Still it is failing..............

use inverse=true on one-to-many and <key-many-to-one> in the PK declaration

emmanual,
Do you mean put the key many-to-one in the parent class, or the child class?

replace <key-property by <key-many-to-one

What is the equivalent of <key-many-to-one> with annotations?