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Hibernate version: 3.0

Mapping documents:
<?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 name="com.hsql.Customer" table="Customer">
<!-- works for schemaExport -->

<id name="id" type="long">
<column name="id" sql-type="int" />
<generator class="increment"/>
</id>


<!-- works for schemaExport -->
<property name="firstname" type="String">
<column name="firstname" sql-type="varchar" />
</property>

<property name="lastname" type="String">
<column name="lastname" sql-type="varchar" />
</property>
<property name="age" type="String">
<column name="age" sql-type="int" />
</property>

<property name="gender" type="String">
<column name="gender" sql-type="char(1)" />
</property>

</class>
</hibernate-mapping>


Code between sessionFactory.openSession() and session.close():
Transaction tx = session.beginTransaction();

Customer customer=new Customer();
customer.setFirstName("John");
customer.setLastName("Doe");
customer.setGender('M');
customer.setAge(33);

session.save(customer);

tx.commit();


Full stack trace of any exception that occurs:
[java] 15:33:42,937 ERROR XMLHelper:59 - Error parsing XML: XML InputStream(20) Attribute "column" must be declared for element type "one-to-many".
[java] Initial SessionFactory creation failed.org.hibernate.MappingException: Error reading resource: CustomerAddress.hbm.xml
[java] Exception in thread "main" java.lang.ExceptionInInitializerError
[java] at com.hsql.HibernateUtil.<clinit>(Unknown Source)
[java] at com.hsql.EventManager.createAndStoreCustomer(Unknown Source)
[java] at com.hsql.EventManager.main(Unknown Source)
[java] Caused by: org.hibernate.MappingException: Error reading resource: CustomerAddress.hbm.xml
[java] at org.hibernate.cfg.Configuration.addResource(Configuration.java:452)
[java] at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1263)
[java] at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1235)
[java] at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1217)
[java] at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1184)
[java] at org.hibernate.cfg.Configuration.configure(Configuration.java:1112)
[java] at org.hibernate.cfg.Configuration.configure(Configuration.java:1098)
[java] ... 3 more
[java] Caused by: org.hibernate.MappingException: invalid mapping
[java] at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:399)
[java] at org.hibernate.cfg.Configuration.addResource(Configuration.java:449)
[java] ... 9 more
[java] Caused by: org.xml.sax.SAXParseException: Attribute "column" must be declared for element type "one-to-many".
[java] at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:236)
[java] at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(ErrorHandlerWrapper.java:172)
[java] at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:382)
[java] at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:316)
[java] at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.addDTDDefaultAttrsAndValidate(XMLDTDValidator.java:1306)
[java] at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleStartElement(XMLDTDValidator.java:1971)
[java] at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.emptyElement(XMLDTDValidator.java:816)
[java] at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(XMLNSDocumentScannerImpl.java:322)
[java] at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1693)
[java] at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)
[java] at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)
[java] at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
[java] at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)
[java] at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1242)
[java] at org.dom4j.io.SAXReader.read(SAXReader.java:465)
[java] at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:398)
[java] ... 10 more

BUILD SUCCESSFUL
Total time: 3 seconds


Name and version of the database you are using:
hsqldb
The generated SQL (show_sql=true):
Generated sql statement for table creation
drop table Customer if exists;
create table Customer (
id int not null,
firstname varchar,
lastname varchar,
age int,
gender char(1),
primary key (id)
);

No Sql statement is generated for the insert statement.
Debug level Hibernate log excerpt:
How to get the hibernate log excerpt?

hibernate.cfg file is missing. So there is no mapping. This is the cause.