I need to map the key and index of the <map> to the properties of the composite-element.

For instance, I'm mapping a history of object state changes. I have two tables, "Object" and "ObjectState". States history is mapped as <map>, with object_id as key and start_date, end_date pair as a composite index.

The problem is that each object state is identified by objectId and startDate property, and I have to use them in equals() and hashCode(). How do I map key and index to the properties of the composite element?

I have absolutely no idea what you are talking about ...

OK.

class MyObject {
long id;
SortedMap history;
}


class MyObjectState {
long key;
Date start;
int value1;
int value2;
int value3;

public boolean equals(Object o) {
return key==o.key && start.equals(o.start);
}
}

<class name="MyObject" table="object">
<id name="id" type="long" column="id" access="field"/>
<map name="history" class="MyObjectState" table="object_history">
<key column="object_id"/>
<index column="start_date"/>
<composite-element>
<property name="value1" column="value1"/>
<property name="value2" column="value2"/>
<property name="value3" column="value3"/>
</composite-element>
</map>
</class>

I need to map values of MyObjectState.key and MyObjectState.start to the object_history.object_id and object_history.start_date to make MyObjectState.equals(...) work.

Try mapping it as another property of the composite-element with insert=false update=false

net.sf.hibernate.MappingException: insert="false", update="false" not supported for properties of components

Well can't map it then probably. Maybe rethink your model.

Thanks anyway.