Spring集成hibernate时，Spring使用事物管理session，但是执行的时候只出现Hibernate: select usertable_seq

Spring配置文件如下：
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xsi:schemaLocation="
        http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
        http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd
        http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
<bean id="txManager"
class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- <bean id="hibernateTemplate" class="org.springframework.orm.hibernate4.HibernateTemplate">
<property name=""></property>
</bean> -->
<tx:advice id="advice" transaction-manager="txManager">
<tx:attributes>
<tx:method name="add*" propagation="REQUIRED"/>
<:attributes>
<:advice>
<aop:config>
<aop:pointcut expression="execution ( * com.tmq.service.impl..*(..))" id="px"/>
<aop:advisor advice-ref="advice" pointcut-ref="px"/>
</aop:config>
<aop:config>
<aop:aspect id="sessionAdvice" ref="sessionAdvice">
<aop:around method="processSession" pointcut="execution(* com.tmq.dao.impl.*.*(..))"/>
</aop:aspect>
</aop:config>
<bean id="sessionAdvice" class="com.tmq.advice.SessionFactoryAdvice">
<property name="sessionFactory" ref="sessionFactory"></property>
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.connection.autoReconnect">true</prop>
<prop key="hibernate.connection.autoReconnectForPools">true</prop>
<prop key="hibernate.connection.characterEncoding">UTF-8</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.Oracle9Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.temp.use_jdbc_metadata_defaults">false</prop>
</props>
</property>
<property name="mappingResources">
<list>
<value>com/tmq/entity/User.hbm.xml<alue>
<st>
</property>
</bean>
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
<property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />
<property name="url" value="jdbc:oracle:thin:@localhost:1521:orcl" />
<!-- 指定连接数据库的用户名 -->
<property name="username" value="test" />
<!-- 指定连接数据库的密码 -->
<property name="password" value="test" />
</bean>
<bean id="userService" class="com.tmq.service.impl.UserServiceImpl">
<property name="userDao" ref="userDao"/>
</bean>
<bean id="userDao" class="com.tmq.dao.impl.UserDaoImpl">
</bean>
</beans>
实体类的hbm文件如下：<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="com.tmq.entity">
<class name="User" table="usertable" mutable="true" dynamic-update="true">
<id name="userId" type="java.lang.Integer" column="USERID">
<generator class="sequence">
<param name="sequence">usertable_seq</param>
</generator>
</id>
<property name="userName" type="java.lang.String"> <column name="USERNAME" length="32" not-null="true"/> </property>
<property name="password" type="java.lang.String"> <column name="PASSWORD" length="32"/> </property>
</class>
</hibernate-mapping>
测试程序如下：
public static void main(String[] args) {

ApplicationContext ac=new ClassPathXmlApplicationContext("application.xml");
/*UserDao userDao=(UserDao) ac.getBean("userDao");
userDao.add(user, session)*/
User u1=new User();
u1.setUserName("aaaa");
u1.setPassword("123");
User u2=new User();
u2.setPassword("456");
UserService userService=(UserService) ac.getBean("userService");
userService.addUser(u1);
//userService.addUser(u2);
}
执行结果如下：Hibernate: select usertable_seq.nextval from dual
是Spring管理session，不需要hibernate自己开启事物提交