my DAOs don't commit !

[dsissoko]

I use spring 1.2.6 with hsqldb 1.7.3 and hibernate 3.
i have a simple DAO that extends HibernateDaoSupport and uses HibernateTemplate. When i perfom a simple insert of a row in the database, the operation is not commited.
if i do it trough a main that uses simple hibernate tx.begin and tx.commit everything goes right.

Here is my DAO code:

public class UniteDao extends HibernateDaoSupport implements UniteDAOIF {
	
	protected static ResourceBundle bundle = ResourceBundle.getBundle("coach.dao.impl.hibernate.message");

	public Long create(Object unite) throws CoachDaoException {
		if (!(unite instanceof UniteIF)) throw new CoachDaoException(bundle.getString("dao.badtype"));
		try {
			Long res;
			res = (Long)getHibernateTemplate().save(unite);
			return res;
		} catch (Exception e) {
			throw new CoachDaoException(bundle.getString("dao.hibernate.error"), e);
		}
	}
}
}

i have the following spring configuration file:

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">

<beans>
	<bean id="gestionnaireTache"
		class="coach.service.impl.basic.GestionnaireTache">
	</bean>
	<bean id="gestionnaireRessource"
		class="coach.service.impl.basic.GestionnaireRessource">
	</bean>
	<bean id="coachFactory"
		class="coach.model.impl.basic.ModelBasicFactory">
		<property name="gestionnaireRessource">
			<ref bean="gestionnaireRessource" />
		</property>
		<property name="gestionnaireTache">
			<ref bean="gestionnaireTache" />
		</property>
	</bean>

	<!-- Session factory pour Hibernate -->
	<bean id="sessionFactory"
		class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
		<property name="mappingResources">
			<list>
				<value>coach/model/impl/basic/Unite.hbm.xml</value>
				<value>
					coach/model/impl/basic/Description.hbm.xml
				</value>
			</list>
		</property>
	</bean>

	<!-- Gestionnaire de transaction pour Hibernate -->
	<bean id="transactionManager"
		class="org.springframework.orm.hibernate3.HibernateTransactionManager">
		<property name="sessionFactory">
			<ref bean="sessionFactory" />
		</property>
	</bean>

	<!-- Interceptor AOP pour hibernate -->
	<bean id="hibernateInterceptor"
		class="org.springframework.orm.hibernate3.HibernateInterceptor">
		<property name="sessionFactory">
			<ref bean="sessionFactory" />
		</property>
	</bean>

	<!-- DAO pour la gestion des Unites -->
	<bean id="uniteDaoTarget"
		class="coach.dao.impl.hibernate.UniteDao">
		<property name="sessionFactory">
			<ref bean="sessionFactory" />
		</property>
	</bean>

	<!-- Proxy genere par Spring pour la gestion des transactions -->
	<bean id="uniteDaoProxy"
		class="org.springframework.aop.framework.ProxyFactoryBean">
		<property name="proxyInterfaces">
			<value>coach.dao.UniteDAOIF</value>
		</property>
		<property name="interceptorNames">
			<list>
				<value>hibernateInterceptor</value>
				<value>uniteDaoTarget</value>
			</list>
		</property>
	</bean>

</beans>

i have a configuration file for hibernate in a propertie file

hibernate.show_sql=true
hibernate.max_fetch_depth=1
hibernate.hbm2ddl.auto=update
hibernate.connection.driver_class=org.hsqldb.jdbcDriver
hibernate.connection.url=jdbc:hsqldb:hsql://localhost/coach
hibernate.connection.username=sa
hibernate.connection.password=
hibernate.dialect=org.hibernate.dialect.HSQLDialect

i have a unit test that checks the creation of an object unite in the database:

public class UniteDaoTest extends TestCase {

	HibernateTemplate hibernateTemplate;
	ModelBasicFactory mvf;
	XmlBeanFactory xbf;
	UniteDAOIF uniteDao;

	protected void setUp() throws Exception {
		super.setUp();
		ClassPathResource res = new ClassPathResource("coach/applicationContext.xml");
		xbf = new XmlBeanFactory(res);
		mvf = (ModelBasicFactory)xbf.getBean("coachFactory");
		uniteDao = (UniteDAOIF)xbf.getBean("uniteDaoTarget");
	}
	
	protected void tearDown() throws Exception {
		super.tearDown();
		xbf.destroySingletons();
	}	

	public void testUniteCreate() throws Throwable {
		//UniteDao uniteDao = new UniteDao();
		//uniteDao.setHibernateTemplate(hibernateTemplate);
		UniteIF unJourHomme = mvf.getJourHomme();
		uniteDao.create(unJourHomme);
	}
}

I'm sure i'm missing something trivial, but i don't know what. Should i perform tx commit in my DAO ?