<document>
      <document_id>bbcards000001</document_id>
      <record_create_date>3-5-2007</record_create_date>
      <indexing_data_id>bbcards</indexing_data_id>
      <item_title>[John Clarkson]</item_title>
      <alternate_title>Allen &amp; Ginter World's Champions (N28)</alternate_title>
      <subject facet="Player">John Clarkson</subject>
      <subject facet="City">Boston</subject>
      <subject facet="Team">Boston Beaneaters</subject>
      <subject facet="League">National League</subject>
      <note>This set is generally acknowledged as the first significant tobacco set issued.  Ten baseball players are included in the set, which also depicts six other sports.</note>
      <note>9 cards in set</note>
     </document>

<?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 entity-name="DigitalObject"
        table="DigitalObjects"
        node="document">
   
       
    <id name="docid" column="DOC_ID" type="int" unsaved-value="0">
         <generator class="native"/>
    </id>
       
    <property name="originalId"
            column="document_id"
            node="document_id"
            type="string"/>

    <property name="item_title"
            column="item_title"
            node="item_title"
            type="string"/>
   
    <property name="alternate_title"
            column="alternate_title"
            node="alternate_title"
            type="string"/>

      <set name="subjects"
            node="."
            embed-xml="true">
        <key column="DOC_ID"
                not-null="true"/>
        <one-to-many entity-name="Subject"
                embed-xml="true"/>
    </set>

    <set name="notes"
            node="."
            embed-xml="true">
        <key column="DOC_ID"
                not-null="true"/>
        <one-to-many entity-name="Note"
                embed-xml="true"/>
    </set>

</class>

   <class entity-name="Subject"
        table="SUBJECTS"
        node="subject">
   
    <id name="subjid" column="SUBJECT_ID" type="int" unsaved-value="0">
         <generator class="native"/>
    </id>

    <many-to-one name="subjectsDo" embed-xml="false" update="false" insert="false" not-null="true" entity-name="DigitalObject" column="DOC_ID"/>

    <property name="facet"
            column="FACET"
            node="@facet"
            type="string"/>

    <property name="subject_text"
            column="SUBJECT_TEXT"
            node="."
            type="string"/>

   </class>

   <class entity-name="Note"
        table="NOTES"
        node="note">
   
    <id name="noteid" column="NOTE_ID" type="int" unsaved-value="0">
         <generator class="native"/>
    </id>

   <many-to-one name="notesDo" embed-xml="false" update="false" insert="false" not-null="true" entity-name="DigitalObject" column="DOC_ID"/>

    <property name="note_text"
            column="NOTE_TEXT"
            node="."
            type="string"/>

     </class>
   
</hibernate-mapping>

Session session = HibernateUtil.getSessionFactory().getCurrentSession();
            session.beginTransaction();
            Session dom4jSession = session.getSession(EntityMode.DOM4J);
            while  ( it.hasNext (  )  )   { 
                Node n =  ( Node ) it.next (  ) ;
               dom4jSession.save("DigitalObject", n);
               /*
               List subjectNodes = n.selectNodes("subject");
               Iterator subjectIt = subjectNodes.iterator();
               while (subjectIt.hasNext())
               {
                  Node sNode = ( Node ) subjectIt.next();
                  dom4jSession.save("Subject", sNode);
               }
            */
               /*
               List noteNodes = n.selectNodes("note");
               Iterator noteIt = noteNodes.iterator();
               while (noteIt.hasNext())
               {
                  Node nNode = ( Node ) noteIt.next();
                  dom4jSession.save("Note", nNode);
               }
               */
             
                System.out.println ("Node saved.");
             }
            session.getTransaction().commit();
            HibernateUtil.getSessionFactory().close();

Exception in thread "main" org.hibernate.HibernateException: Found shared references to a collection: DigitalObject.notes
   at org.hibernate.engine.Collections.processReachableCollection(Collections.java:163)
   at org.hibernate.event.def.FlushVisitor.processCollection(FlushVisitor.java:37)
   at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:101)
   at org.hibernate.event.def.AbstractVisitor.processValue(AbstractVisitor.java:61)
   at org.hibernate.event.def.AbstractVisitor.processEntityPropertyValues(AbstractVisitor.java:55)
   at org.hibernate.event.def.DefaultFlushEntityEventListener.onFlushEntity(DefaultFlushEntityEventListener.java:131)
   at org.hibernate.event.def.AbstractFlushingEventListener.flushEntities(AbstractFlushingEventListener.java:196)
   at org.hibernate.event.def.AbstractFlushingEventListener.flushEverythingToExecutions(AbstractFlushingEventListener.java:76)
   at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:26)
   at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:1000)
   at org.hibernate.impl.SessionImpl.managedFlush(SessionImpl.java:343)
   at org.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:106)
   at gov.loc.am.nonmarc.NonMarcXmlIngestOperation.main(NonMarcXmlIngestOperation.java:57)

<notes>
<note>This set is generally acknowledged as the first significant tobacco set issued.  Ten baseball players are included in the set, which also depicts six other sports.</note>
      <note>9 cards in set</note>
</notes>