<bean id="txManager" class="org.springframework.transaction.jta.JtaTransactionManager">
        <property name="allowCustomIsolationLevels" value="true"/>
        <property name="nestedTransactionAllowed" value="true"/>
</bean>

<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
        <property name="configurationClass" value="org.hibernate.cfg.AnnotationConfiguration"/>
        <property name="configLocation" value="/WEB-INF/hibernate.cfg.xml"/>
        <property name="dataSource" ref="dataSource"/>
       <property name="jtaTransactionManager">
          <bean factory-bean="txManager" factory-method="getTransactionManager"/>
        </property>
</bean>

<tx:annotation-driven transaction-manager="txManager"/>