create table j_accts(
id INT NOT NULL AUTO_INCREMENT PRIMARY KEY,
acct           varchar(5) not null,
branch         varchar(2) not null,
unique key(acct,branch)
) engine=innodb; 


Acct.hbm.xml
<hibernate-mapping>
    <class name="Acct" table="j_accts">
            <id name="id" type="java.lang.Long" column="id">
                 <generator class="identity"/>
            </id>
              <composite-id>
               <key-property name="acct" type="java.lang.String" length="5" column="acct"/>
               <key-property name="branch" type="java.lang.String" length="2" column="branch"/>
             </composite-id>
   </class>
</hibernate-mapping>

if i remove section of <composite-id>...</composite-id>, when start server, no complain.

but i want to use the <composite-id>....then have the following error

Caused by: org.hibernate.InvalidMappingException: Unable to read XML
        at org.hibernate.util.xml.MappingReader.readMappingDocument(MappingReader.java:101)
        at org.hibernate.cfg.Configuration.add(Configuration.java:513)
        at org.hibernate.cfg.Configuration.add(Configuration.java:509)
        at org.hibernate.cfg.Configuration.add(Configuration.java:716)
        at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:756)
        at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:677)
        at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:211)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1477)
        at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1417)
        ... 22 more
Caused by: org.xml.sax.SAXParseException: The content of element type "class" must match "(meta*,subselect?,cache?,synchronize*,comment?,tuplizer*,(id|composite-id),discriminator?,natural-id?,(version|timestamp)?,(property|many-to-one|one-to-one|component|dynamic-component|properties|any|map|set|list|bag|idbag|array|primitive-array)*,((join*,subclass*)|joined-subclass*|union-subclass*),loader?,sql-insert?,sql-update?,sql-delete?,filter*,fetch-profile*,resultset*,(query|sql-query)*)".
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
        at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:131)
        at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:384)
        at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:318)
        at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleEndElement(XMLDTDValidator.java:2017)
        at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.endElement(XMLDTDValidator.java:901)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1782)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(XMLDocumentFragmentScannerImpl.java:2939)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
        at org.dom4j.io.SAXReader.read(SAXReader.java:465)
        at org.hibernate.util.xml.MappingReader.readMappingDocument(MappingReader.java:75)
        ... 30 more


please advise

thanks in advance

john