4:30:27,094 DEBUG SessionImpl:656 - saving [com.demo.hb.Vendor#100062]
4:30:27,094 DEBUG Cascades:336 - processing cascades for: com.demo.hb.Vendor
4:30:27,104 DEBUG Cascades:344 - done processing cascades for: com.demo.hb.Vendor
4:30:27,114 DEBUG Cascades:336 - processing cascades for: com.demo.hb.Vendor
4:30:27,114 DEBUG Cascades:87 - cascading to saveOrUpdate()
4:30:27,114 DEBUG Cascades:237 - unsaved-value strategy NULL
4:30:27,114 DEBUG SessionImpl:1201 - saveOrUpdate() unsaved instance with id: null
4:30:27,124  WARN RequestProcessor:538 - Unhandled Exception thrown: class java.lang.NullPointerException
Oct 9, 2003 2:30:27 PM EDT> <Error> <HTTP> <BEA-101017> <[ServletContext(id=32225808,name=hb,context-path=)] Root cause of ServletException.
ava.lang.NullPointerException: attempted to save null
       at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:580)
       at net.sf.hibernate.id.ForeignGenerator.generate(ForeignGenerator.java:37)
       at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:599)
       at net.sf.hibernate.impl.SessionImpl.saveOrUpdate(SessionImpl.java:1202)
       at net.sf.hibernate.engine.Cascades$3.cascade(Cascades.java:88)
       at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:258)
       at net.sf.hibernate.engine.Cascades.cascade(Cascades.java:341)
       at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:739)
       at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:605)
       at com.demo.hb.BaseDAO.addVendor(BaseDAO.java:47)

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
    <class name="com.demo.hb.Vendor" table="HB_VENDOR">
        <id name="vendorId" column="VENDORID" unsaved-value="null">
           <generator class="sequence">
              <param name="sequence">seq_vendorid</param>
           </generator>
          </id>
        <property name="vendorName" column="VENDORNAME"/>
        <one-to-one name="contact" class="com.demo.hb.Contact" cascade="all"/>
    </class>
</hibernate-mapping>

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
    <class name="com.demo.hb.Contact" table="HB_VENDOR_CONTACT">
       <id name="contactId" column="VENDORID" unsaved-value="null">
            <generator class="foreign">
               <param name="property">vendor</param>
            </generator>
        </id>
        <property name="contactCity" column="CITY"/>
        <property name="contactCountry" column="COUNTRY"/>
        <property name="contactFirstName" column="CONTACTFIRSTNAME"/>
        <property name="contactLastName" column="CONTACTLASTNAME"/>
        <property name="contactLine1" column="ADDRESSLINE1"/>
        <property name="contactLine2" column="ADDRESSLINE2"/>
        <property name="contactState" column="STATE"/>
        <property name="contactTitle" column="CONTACTTITLE"/>
        <property name="contactZip" column="ZIP"/>
      <one-to-one name="vendor" class="com.demo.hb.Vendor"/>
    </class>
</hibernate-mapping>

//Parent XML maps to Party:
<class name="cdl.impl.XMLImpl" table="XML">
    <id name="XMLID" column="XMLID" type ="java.lang.Long" unsaved-value="null">
        <generator class="identity"/>
    </id>
...
    <one-to-one name="Party" class="cdl.impl.PartyImpl" cascade="all"/>
...

//Child Party maps to XML:
<class name="cdl.impl.PartyImpl" table="Party">
    <id name="XMLID" column="XMLID" type ="java.lang.Long" unsaved-value="null">
        <generator class="foreign">
            <param name="property">XML</param>
        </generator>
    </id>
    <one-to-one name="XML" class="cdl.impl.XMLImpl" constrained="true"/>
...