<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
      "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
   <class name="be.kuleuven.toledo.model.bean.User" table="TLUSER">
      <composite-id name="sourcedId" class="be.kuleuven.toledo.model.bean.SourcedId">
           <key-property name="source" column="DATASOURCE" />
           <key-property name="id" column="SOURCEID" />
       </composite-id>
      <timestamp name="modifiedDate" column="MODDATE"/>
      <property name="userId" column="USERID" type="long" access="field"/>
      <property name="inet" column="INET" type="string"/>
      <property name="firstName" column="VNAAM" type="string"/>
      <property name="familyName" column="FNAAM" type="string"/>
      <property name="emailAddress" column="EMAIL" type="string"/>
      <property name="creationDate" column="CRDATE" type="timestamp"/>
   </class>
</hibernate-mapping>

// build a list of of objects of composed-id
String[] ids = {"u0040926","u0040925"};
List list = new ArrayList();
for (int i = 0; i < ids.length; i++) {
   SourcedId sourcedId =  new SourcedId();
   sourcedId.setId(ids[i]);
   sourcedId.setSource("KULEUVEN");
   list.add(sourcedId);
}

// find all objects with composed-id in list
session.createCriteria(User.class).add(
   Expression.in("sourcedId", list)).list();