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BOOK: Professional Hibernate
This is the forum to discuss the Wrox book Professional Hibernate by Eric Pugh, Joseph D. Gradecki; ISBN: 9780764576775
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Old October 9th, 2005, 06:41 AM
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Default Table-per-Class Hierarchy on page 110

I had follow the example in the book. There are one example to persist Table-per-Class Hierarchy on page 110. It can't work, the error show like this,

[ERROR] 07:18 (XMLHelper.java:error:48)
Error parsing XML: XML InputStream(10) Attribute "insert" must be declared for element type "discriminator".

18:07:18,922 - ERROR net.sf.hibernate.util.XMLHelper - Error parsing XML: XML InputStream(10) Attribute "insert" must be declared for element type "discriminator".
1072 [main] ERROR net.sf.hibernate.util.XMLHelper - Error parsing XML: XML InputStream(10) Attribute "insert" must be declared for element type "discriminator".
%%%% Error Creating SessionFactory %%%%
net.sf.hibernate.MappingException: Error reading resource: eg/hibernate/mapping/dataobject/CD.hbm.xml
    at net.sf.hibernate.cfg.Configuration.addResource(Con figuration.java:336)
    at net.sf.hibernate.cfg.Configuration.doConfigure(Con figuration.java:990)
    at net.sf.hibernate.cfg.Configuration.doConfigure(Con figuration.java:946)
    at net.sf.hibernate.cfg.Configuration.configure(Confi guration.java:874)
    at de.laliluna.library.HibernateSessionFactory.curren tSession(HibernateSessionFactory.java:57)
    at de.laliluna.library.test.LibraryTest.main(LibraryT est.java:43)
Caused by: net.sf.hibernate.MappingException: invalid mapping
    at net.sf.hibernate.cfg.Configuration.addInputStream( Configuration.java:284)
    at net.sf.hibernate.cfg.Configuration.addResource(Con figuration.java:333)
    ... 5 more
Caused by: org.xml.sax.SAXParseException: Attribute "insert" must be declared for element type "discriminator".
    at com.sun.org.apache.xerces.internal.util.ErrorHandl erWrapper.createSAXParseException(ErrorHandlerWrap per.java:236)
    at com.sun.org.apache.xerces.internal.util.ErrorHandl erWrapper.error(ErrorHandlerWrapper.java:172)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorRe porter.reportError(XMLErrorReporter.java:382)
    at com.sun.org.apache.xerces.internal.impl.XMLErrorRe porter.reportError(XMLErrorReporter.java:316)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTD Validator.addDTDDefaultAttrsAndValidate(XMLDTDVali dator.java:1306)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTD Validator.handleStartElement(XMLDTDValidator.java: 1971)
    at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTD Validator.emptyElement(XMLDTDValidator.java:816)
    at com.sun.org.apache.xerces.internal.impl.XMLNSDocum entScannerImpl.scanStartElement(XMLNSDocumentScann erImpl.java:322)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumen tFragmentScannerImpl$FragmentContentDispatcher.dis patch(XMLDocumentFragmentScannerImpl.java:1693)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumen tFragmentScannerImpl.scanDocument(XMLDocumentFragm entScannerImpl.java:368)
    at com.sun.org.apache.xerces.internal.parsers.XML11Co nfiguration.parse(XML11Configuration.java:834)
    at com.sun.org.apache.xerces.internal.parsers.XML11Co nfiguration.parse(XML11Configuration.java:764)
    at com.sun.org.apache.xerces.internal.parsers.XMLPars er.parse(XMLParser.java:148)
    at com.sun.org.apache.xerces.internal.parsers.Abstrac tSAXParser.parse(AbstractSAXParser.java:1242)
    at org.dom4j.io.SAXReader.read(SAXReader.java:339)
    at net.sf.hibernate.cfg.Configuration.addInputStream( Configuration.java:283)
    ... 6 more
Exception in thread "main" java.lang.NullPointerException
    at de.laliluna.library.HibernateSessionFactory.curren tSession(HibernateSessionFactory.java:65)
    at de.laliluna.library.test.LibraryTest.main(LibraryT est.java:43)

I have wrote hbm.xml like this
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN"
<hibernate-mapping package="eg.hibernate.mapping.dataobject">
 <class discriminator-value="CD"
  name="eg.hibernate.mapping.dataobject.CD" table="CD">
  <id name="id" type="int">
   <generator class="native"/>
  <discriminator column="cd_type" force="false" insert="true" length="2"/>
  <property name="title"/>
  <property name="purchaseDate" type="date"/>
  <property name="artist"/>
  <property name="cost" type="double"/>
  <subclass discriminator-value="SP" dynamic-insert="true" name="eg.hibernate.mapping.dataobject.CDSpecialEdi tion">
   <property name="newfeatures"/>
  <subclass discriminator-value="IT" dynamic-insert="true" name="eg.hibernate.mapping.dataobject.CDInternatio nal">
   <property name="region"/>
   <property name="language"/>

I would appreciate if you could suggest me what is wrong.


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