springMVC没有事物 保存数据保存不了，纠结一天了解决方案

<aop:aspectj-autoproxy/>    <context:component-scan base-package="net.orc,com.spring3"/>        <context:property-placeholder location="classpath:jdbc.properties"/>    <bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">        <property name="driverClass" value="${driverClass}"/>        <property name="jdbcUrl" value="${jdbcUrl}"/>        <property name="user" value="${user}"/>        <property name="password" value="${password}"/>        <property name="initialPoolSize" value="1"/>        <property name="minPoolSize" value="1"/>            <property name="maxPoolSize" value="300"/>        <property name="maxIdleTime" value="60"/>            <!-- 当连接池中的连接耗尽的时候c3p0一次同时获取的连接数。Default: 3  -->        <property name="acquireIncrement" value="5"/>            <!-- 每60秒检查所有连接池中的空闲连接。Default: 0  -->        <property name="idleConnectionTestPeriod" value="60"/>    </bean>    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">        <property name="dataSource" ref="dataSource"/>        <property name="persistenceXmlLocation" value="classpath:META-INF/persistence.xml" />        <property name="loadTimeWeaver">              <bean class="org.springframework.instrument.classloading.InstrumentationLoadTimeWeaver"/>        </property>    </bean>        <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">        <property name="entityManagerFactory" ref="entityManagerFactory"/>   </bean>      <tx:annotation-driven transaction-manager="transactionManager"/>

package net.orc.service.base;import javax.persistence.EntityManager;import javax.persistence.PersistenceContext;import org.springframework.transaction.annotation.Transactional;@SuppressWarnings("unchecked")@Transactionalpublic abstract class DaoSupport<T> implements DAO<T>{    @PersistenceContext protected EntityManager em;    public void save(T entity) {        em.persist(entity);    }        public void update(T entity) {        em.merge(entity);    }}