<hibernate-mapping>
   <class name="com.hibtest.ClassA" table="class_a" schema="abc" mutable="false">
      <composite-id>
         <key-property name="pka1" column="pk_a1" type="java.lang.Long"/>
         <key-property name="pka2" column="pk_a2" type="java.lang.String" length="2"/>
         <key-property name="pka3" column="pk_a3" type="java.lang.String"/>
      </composite-id>
      <property name="flda1" column="fld_a1" type="java.lang.String" length="7" not-null="true"/>
      <!-- Associations -->
      <many-to-one name="classB" class="com.hibtest.ClassB" insert="false" update="false">
         <column name="pk_b1"/>
      </many-to-one>
      <many-to-one name="classC" class="com.hibtest.ClassC" insert="false" update="false">
         <column name="pk_c1"/>
         <column name="pk_c2"/>
      </many-to-one>
   </class>
</hibernate-mapping>


<hibernate-mapping>
   <class name="com.hibtest.ClassB" table="class_b" schema="abc" mutable="false">
      <id column="pk_b1" name="pkb1" type="java.lang.Long">
         <generator class="native"/>
      </id>
      <property column="fld_b1" length="4" name="fldb1" not-null="true" type="java.lang.String"/>
      <!-- Associations -->
      <set name="classAObjects" lazy="true" cascade="none" inverse="true">
         <key>
            <column name="pk_a1"/>
            <column name="pk_a2"/>
         </key>
         <one-to-many class="com.hibtest.classA"/>
      </set>
   </class>
</hibernate-mapping>


<hibernate-mapping>
   <class name="com.hibtest.ClassC" table="class_c" schema="abc" mutable="false">
      <composite-id>
         <key-property name="pkc1" column="pk_c1" type="java.lang.Long"/>
         <key-property name="pkc2" column="pk_c2" type="java.lang.String" length="2"/>
      </composite-id>
      <property name="fldc1" column="fld_c1" type="java.lang.String" length="12" not-null="true"/>
      <!-- Associations -->
      <set name="classAObjects" lazy="true" cascade="none" inverse="true">
         <key>
            <column name="pk_a1"/>
            <column name="pk_a2"/>
         </key>
         <one-to-many class="com.hibtest.classA"/>
      </set>
   </class>
</hibernate-mapping>

/*
  Getters/setters removed for brevity in this example
/*

public class ClassA implements Serializable {
    // Many of ClassA to one of these
    private ClassB classB;
    private ClassC classC;
   
    // Our composite key fields
    private Long pka1;      // foreign key to ClassB.pkb1 and ClassC.pkc1
    private String pka2;    // foreign key to ClassC.pkc1
    private String pka3;
   
    // A regular persistent field
    private String flda1;
}

public class ClassB implements Serializable {   
    // One ClassB to many ClassA's
    private Set classAOjbects;
   
    // Our primary key field
    private Long pkb1;      // referenced by foreign key ClassA.pka1
   
    // A regular persistent field
    private String fldb1;
}

public class ClassC implements Serializable {
    // One ClassC to many ClassA's
    private Set classAObjects;
   
    // Our composite key fields
    private Long pkc1;      // referenced by foreign key ClassA.pka1
    private String pkc2;    // referenced by foreign key ClassA.pka2
   
    // A regular persistent field
    private String fldc1;
}