Hibernate/config-example

Person.java

package events;

import java.util.*;

public class Person {

    private Long id;
    private int age;
    private String firstname;
    private String lastname;
    private Set emailAddresses = new HashSet();
    private Set events = new HashSet();

    public Person() {}

    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
             .....setters and getters for each property etc......

    protected Set getEvents() {
        return events;
    }
    protected void setEvents(Set events) {
        this.events = events;
    }


}

person.hbm.xml mapping file for Person.java

<?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="events.Person" table="PERSON">
        <id name="id" column="PERSON_ID">
            <generator class="native"/>
        </id>
        <property name="age"/>
        <property name="firstname"/>
        <property name="lastname"/>

        <set name="events" table="PERSON_EVENT">
            <key column="PERSON_ID"/>
            <many-to-many column="EVENT_ID" class="events.Event"/>
        </set>
        
        <set name="emailAddresses" table="PERSON_EMAIL_ADDR">
            <key column="PERSON_ID"/>
            <element type="string" column="EMAIL_ADDR"/>
        </set>

    </class>

</hibernate-mapping>

hibernate.cfg.xml configuration file.

<?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>

        <!-- Database connection settings -->
        <property name="connection.driver_class">org.hsqldb.jdbcDriver</property>
        <property name="connection.url">jdbc:hsqldb:hsql://localhost</property>
        <property name="connection.username">sa</property>
        <property name="connection.password"></property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.HSQLDialect</property>

        <!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class">thread</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">create</property>

        <mapping resource="events/Event.hbm.xml"/>
        <mapping resource="events/Person.hbm.xml"/>

    </session-factory>

</hibernate-configuration>