Primary key is not created for a Set after loading from XML mapping file:
<class name="PersonGroup">
<id name="id" type="long">
<generator class="native" />
</id>
<set name="persons" table="Person">
<key column="group" foreign-key="person_persongroup_fk"/>
<element column="name" type="string" not-null="true" />
</set>
</class>
Expected result: primary key (group, name) on Person
In Version 4.3 the primary key creation worked.