<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
  <session-factory>
    <property name="hibernate.connection.driver_class">
      com.mysql.jdbc.Driver
    </property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost/navengine</property>
    <property name="hibernate.connection.username">username</property>
    <property name="hibernate.connection.password">password</property>
    <property name="hibernate.dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.show_sql">true</property>
    <property name="transaction.factory_class">
      org.hibernate.transaction.JDBCTransactionFactory
    </property>
    <property name="hibernate.cache.provider_class">
      org.hibernate.cache.HashtableCacheProvider
    </property>
    <property name="hibernate.hbm2ddl.auto">update</property>
    <mapping resource="Event.hbm.xml"/>
    <mapping resource="Person.hbm.xml"/>
  </session-factory>
</hibernate-configuration>

<?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="Event" table="event">
       <id name="id" type="integer">
            <generator class="native"/>
       </id>
       <property name="title" type="string"/>
       <property name="datetime" type="timestamp"/>
       <list name="participants" table="event_participants">
           <key column="event_id"/>
           <list-index column="ind"/>
           <many-to-many column="person_id" class="Person"/>
         </list>
     </class>
</hibernate-mapping>

import java.util.*;
public class Event {
   private long id;
   private String title;
   private Date datetime;
   private List<Person> participants = new ArrayList<Person>();

   public long getId() { return id; }
   public void setId(long id) { this.id = id;   }
   public String getTitle() {   return title; }
   public void setTitle(String title) { this.title = title; }
   public Date getDatetime() {   return datetime; }
   public void setDatetime(Date datetime) { this.datetime = datetime; }
   public List<Person> getParticipants() {   return participants; }
   public void setParticipants(List<Person> participants) { this.participants = participants;   }
}

<?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="Person" table="person">
       <id name="id" type="integer">
          <generator class="native"/>
       </id>
       <property name="name" type="string"/>
   </class>
</hibernate-mapping>

public class Person {
   private long id;
   private String name;
      
   public long getId() { return id;}
   public void setId(long id) { this.id = id;   }
   public String getName() { return name;   }
   public void setName(String name) { this.name = name; }
}

Person p1 = new Person();
Person p2 = new Person();
List<Person> personlist = new ArrayList<Person>();
      
p1.setName("Goerge Mason");
p2.setName("Jack Bauer");
personlist.add(p1);
personlist.add(p2);
   
Event e1 = new Event();
e1.setTitle("Business Meeting at Conference Room");
e1.setDatetime(new Date());
e1.setParticipants(personlist);
                  
SessionFactory sessionFactory;
Configuration config = new Configuration().configure();
SchemaExport export = new SchemaExport(config);
export.create(false,true);
sessionFactory = config.buildSessionFactory();
            
Session     sess = null;
Transaction trx  = null;
try {
       sess = sessionFactory.openSession();
       trx  = sess.beginTransaction();
       sess.save(p1);
       sess.save(p2);
       sess.save(e1);
       trx.commit();
}
catch( HibernateException ex )  {
        if( trx != null ) { trx.rollback(); }
   System.out.println(ex.toString());
}
finally { if( sess != null ) sess.close(); }

0    [main] INFO  org.hibernate.cfg.Environment  - Hibernate 3.2.5
12   [main] INFO  org.hibernate.cfg.Environment  - hibernate.properties not found
16   [main] INFO  org.hibernate.cfg.Environment  - Bytecode provider name : cglib
24   [main] INFO  org.hibernate.cfg.Environment  - using JDK 1.4 java.sql.Timestamp handling
164  [main] INFO  org.hibernate.cfg.Configuration  - configuring from resource: /hibernate.cfg.xml
165  [main] INFO  org.hibernate.cfg.Configuration  - Configuration resource: /hibernate.cfg.xml
619  [main] INFO  org.hibernate.cfg.Configuration  - Reading mappings from resource : Event.hbm.xml
839  [main] INFO  org.hibernate.cfg.HbmBinder  - Mapping class: Event -> event
879  [main] INFO  org.hibernate.cfg.HbmBinder  - Mapping collection: Event.participants -> event_participants
884  [main] INFO  org.hibernate.cfg.Configuration  - Reading mappings from resource : Person.hbm.xml
952  [main] INFO  org.hibernate.cfg.HbmBinder  - Mapping class: Person -> person
954  [main] INFO  org.hibernate.cfg.Configuration  - Configured SessionFactory: null
1006 [main] INFO  org.hibernate.dialect.Dialect  - Using dialect: org.hibernate.dialect.MySQLDialect
1213 [main] INFO  org.hibernate.tool.hbm2ddl.SchemaExport  - Running hbm2ddl schema export
1214 [main] INFO  org.hibernate.tool.hbm2ddl.SchemaExport  - exporting generated schema to database
1220 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - Using Hibernate built-in connection pool (not for production use!)
1221 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - Hibernate connection pool size: 20
1221 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - autocommit mode: false
1241 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://localhost/navengine
1241 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - connection properties: {user=root, password=****}
1627 [main] INFO  org.hibernate.tool.hbm2ddl.SchemaExport  - schema export complete
1628 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - cleaning up connection pool: jdbc:mysql://localhost/navengine
1635 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - Using Hibernate built-in connection pool (not for production use!)
1636 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - Hibernate connection pool size: 20
1636 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - autocommit mode: false
1636 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - using driver: com.mysql.jdbc.Driver at URL: jdbc:mysql://localhost/navengine
1636 [main] INFO  org.hibernate.connection.DriverManagerConnectionProvider  - connection properties: {user=root, password=****}
1676 [main] INFO  org.hibernate.cfg.SettingsFactory  - RDBMS: MySQL, version: 5.0.38-Ubuntu_0ubuntu1-log
1676 [main] INFO  org.hibernate.cfg.SettingsFactory  - JDBC driver: MySQL-AB JDBC Driver, version: mysql-connector-java-5.0.4 ( $Date: 2006-10-19 17:47:48 +0200 (Thu, 19 Oct 2006) $, $Revision: 5908 $ )
1682 [main] INFO  org.hibernate.dialect.Dialect  - Using dialect: org.hibernate.dialect.MySQLDialect
1696 [main] INFO  org.hibernate.transaction.TransactionFactoryFactory  - Transaction strategy: org.hibernate.transaction.JDBCTransactionFactory
1701 [main] INFO  org.hibernate.transaction.TransactionManagerLookupFactory  - No TransactionManagerLookup configured (in JTA environment, use of read-write or transactional second-level cache is not recommended)
1701 [main] INFO  org.hibernate.cfg.SettingsFactory  - Automatic flush during beforeCompletion(): disabled
1701 [main] INFO  org.hibernate.cfg.SettingsFactory  - Automatic session close at end of transaction: disabled
1701 [main] INFO  org.hibernate.cfg.SettingsFactory  - JDBC batch size: 15
1702 [main] INFO  org.hibernate.cfg.SettingsFactory  - JDBC batch updates for versioned data: disabled
1703 [main] INFO  org.hibernate.cfg.SettingsFactory  - Scrollable result sets: enabled
1703 [main] INFO  org.hibernate.cfg.SettingsFactory  - JDBC3 getGeneratedKeys(): enabled
1704 [main] INFO  org.hibernate.cfg.SettingsFactory  - Connection release mode: auto
1705 [main] INFO  org.hibernate.cfg.SettingsFactory  - Maximum outer join fetch depth: 2
1705 [main] INFO  org.hibernate.cfg.SettingsFactory  - Default batch fetch size: 1
1706 [main] INFO  org.hibernate.cfg.SettingsFactory  - Generate SQL with comments: disabled
1706 [main] INFO  org.hibernate.cfg.SettingsFactory  - Order SQL updates by primary key: disabled
1706 [main] INFO  org.hibernate.cfg.SettingsFactory  - Order SQL inserts for batching: disabled
1706 [main] INFO  org.hibernate.cfg.SettingsFactory  - Query translator: org.hibernate.hql.ast.ASTQueryTranslatorFactory
1711 [main] INFO  org.hibernate.hql.ast.ASTQueryTranslatorFactory  - Using ASTQueryTranslatorFactory
1711 [main] INFO  org.hibernate.cfg.SettingsFactory  - Query language substitutions: {}
1711 [main] INFO  org.hibernate.cfg.SettingsFactory  - JPA-QL strict compliance: disabled
1711 [main] INFO  org.hibernate.cfg.SettingsFactory  - Second-level cache: enabled
1712 [main] INFO  org.hibernate.cfg.SettingsFactory  - Query cache: disabled
1712 [main] INFO  org.hibernate.cfg.SettingsFactory  - Cache provider: org.hibernate.cache.HashtableCacheProvider
1714 [main] INFO  org.hibernate.cfg.SettingsFactory  - Optimize cache for minimal puts: disabled
1714 [main] INFO  org.hibernate.cfg.SettingsFactory  - Structured second-level cache entries: disabled
1723 [main] INFO  org.hibernate.cfg.SettingsFactory  - Echoing all SQL to stdout
1724 [main] INFO  org.hibernate.cfg.SettingsFactory  - Statistics: disabled
1724 [main] INFO  org.hibernate.cfg.SettingsFactory  - Deleted entity synthetic identifier rollback: disabled
1724 [main] INFO  org.hibernate.cfg.SettingsFactory  - Default entity-mode: pojo
1724 [main] INFO  org.hibernate.cfg.SettingsFactory  - Named query checking : enabled
1815 [main] INFO  org.hibernate.impl.SessionFactoryImpl  - building session factory
2399 [main] INFO  org.hibernate.impl.SessionFactoryObjectFactory  - Not binding factory to JNDI, no JNDI name configured
2405 [main] INFO  org.hibernate.tool.hbm2ddl.SchemaUpdate  - Running hbm2ddl schema update
2405 [main] INFO  org.hibernate.tool.hbm2ddl.SchemaUpdate  - fetching database metadata
2407 [main] INFO  org.hibernate.tool.hbm2ddl.SchemaUpdate  - updating schema
2468 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - table found: navengine.event
2469 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - columns: [id, title, datetime]
2470 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - foreign keys: []
2470 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - indexes: [primary]
2504 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - table found: navengine.event_participants
2504 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - columns: [person_id, ind, event_id]
2504 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - foreign keys: []
2506 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - indexes: [fkbbcd7925c12321ba, fkbbcd79251497435a, primary]
2540 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - table found: navengine.person
2541 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - columns: [id, name]
2541 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - foreign keys: []
2541 [main] INFO  org.hibernate.tool.hbm2ddl.TableMetadata  - indexes: [primary]
2542 [main] INFO  org.hibernate.tool.hbm2ddl.SchemaUpdate  - schema update complete
Hibernate: insert into person (name) values (?)
Hibernate: insert into person (name) values (?)
Hibernate: insert into event (title, datetime) values (?, ?)
org.hibernate.HibernateException: identifier of an instance of Person was altered from 1 to 1