解决办法
原先：<bean id="sessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
改成：<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
原先：<bean id="transactionManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
改成：<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">