NEW CONF: i made some change to match with what you are saying. now i deleted hibernate-cfg.xml and did all conf in spring-servlet.xml :
<jee:jndi-lookup id="ReferentielWebDevDataSource"
jndi-name="ReferentielWebDevDataSource" />
<bean id="sessionFactory"
class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="ReferentielWebDevDataSource" />
<property name="transaction.factory_class">
<value>org.hibernate.transaction.JDBCTransactionFactory</value>
</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">
<value>org.hibernate.cache.NoCacheProvider</value>
</property>
<property name="hibernate.show_sql">
<value>true</value>
</property>
<property name="dialect">
<value>${jdbc.dialect}</value>
</property>
<property name="connection.driver_class">
<value>${jdbc.driverClassName}</value>
</property>
<property name="connection.url">
<value>${jdbc.databaseurl}</value>
</property>
<property name="connection.username">
<value>${jdbc.username}</value>
</property>
<property name="connection.password">
<value>${jdbc.password}</value>
</property>
<property name="current_session_context_class">
<value>thread</value>
</property>
</bean>
<tx:annotation-driven transaction-manager="transactionManager" …
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