public class Action {   
   private int actionId;   
   private String className;
   private final Map<String, String> labels = new HashMap<String, String>();
[... Getters and Setters ...]
}

<hibernate-mapping>
    <class name="ch.arpage.collaboweb.model.Action" table="actions" catalog="collaboweb" lazy="false">
        <comment></comment>
        <id name="actionId" type="int">
            <column name="ACTION_ID" />
            <generator class="assigned" />
        </id>
        <property name="className" type="string">
            <column name="CLASS" length="100">
                <comment></comment>
            </column>
        </property>
        <map name="labels" table="action_labels" cascade="all">
           <key column="ACTION_ID"/>
           <map-key type="string" column="LANGUAGE"/>
           <element type="string" column="LABEL"/>
        </map>
    </class>
</hibernate-mapping>

Action action = new Action();
action.setClassName("actions.Test");
action.setLabel("de", "Test");
action.setLabel("en", "Test");
getHibernateTemplate().save(action);

private final Map<String, String> labels = new HashMap<String, String>();

public void setLabels(Map<String, String> labels) {
  this.labels.clear();
  this.labels.putAll(labels);
}

public void setLabels(Map<String, String> labels) {
  this.labels = labels;
}