spring 管理hibernate事务时报错，事务出错,该怎么处理

    <context:annotation-config />    <context:component-scan base-package="com.itadmin" />    <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource"        destroy-method="close">        <property name="driverClassName" value="${jdbc.driverClassName}" />        <property name="url" value="${jdbc.url}" />        <property name="username" value="${jdbc.username}" />        <property name="password" value="${jdbc.password}" />    </bean>    <context:property-placeholder location="/WEB-INF/jdbc.properties" />    <bean id="sessionFactory"        class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">        <property name="dataSource" ref="dataSource" />        <property name="annotatedClasses"><!-- 将实体类注入annotatedClasses属性 -->            <list>                <value>com.itadmin.model.User</value>                <value>com.itadmin.model.Product</value>                <value>com.itadmin.model.ProductLog</value>                <value>com.itadmin.model.SaleRecord</value>                <value>com.itadmin.model.User</value>            </list>        </property>        <!-- hibernate的一些配置 -->        <property name="hibernateProperties">            <props>                <prop key="hibernate.dialect">org.hibernate.dialect.OracleDialect</prop>                <prop key="hibernate.show_sql">true</prop>                <prop key="hibernate.format_sql">true</prop>                <prop key="hibernate.current_session_context_class">thread</prop>            </props>        </property>    </bean>    <bean id="loginAction" class="com.itadmin.action.LoginAction">        <property name="userService">            <ref bean="userService"/>         </property>    </bean>          <bean id="logoutAction" class="com.itadmin.action.LogoutAction">    </bean>           <bean id="transactionManager"       class="org.springframework.orm.hibernate3.HibernateTransactionManager">       <property name="sessionFactory">        <ref local="sessionFactory" />       </property>     </bean>         <bean id="txManager"        class="org.springframework.orm.hibernate3.HibernateTransactionManager">        <property name="sessionFactory" ref="sessionFactory" />    </bean>        <tx:annotation-driven transaction-manager="txManager"/></beans>

package com.itadmin.service;@Service("productService")public class ProductService {    private LogDao logDao;    // private ProductDao productDao = new ProductDao();    // private LogDao logDao = new LogDao();    private ProductDao productDao;    private Map productsMap;    public LogDao getLogDao() {        return logDao;    }    @Transactional    public Product getProductById(int id) {        Product product = productDao.findProductById(id);        return product;    }    public ProductDao getProductDao() {        return productDao;    }    public Map getProductsMap() {        return productsMap;    }    public Map queryAllProduct() {        productsMap = productDao.queryAllProducts();        return productsMap;    }    // 分页时,按页码查询用户信息    @Transactional    public PageResult queryProductByPage(Page page) {        page = PageUtil.createPage(page.getEveryPage(), productDao                .countRecords(), page.getCurrentPage());        List<Product> list = productDao.findProductByPage(page);        // 封装分页信息和记录信息，返回给调用处        PageResult pageResult = new PageResult(page, list);        return pageResult;    }    @Transactional    public List<Product> querySingleProduct(String name) {        List<Product> list = productDao.getProductByName(name);        return list;    }    @Resource    public void setLogDao(LogDao logDao) {        this.logDao = logDao;    }    @Resource    public void setProductDao(ProductDao productDao) {        this.productDao = productDao;    }    public void setProductsMap(Map productsMap) {        this.productsMap = productsMap;    }    @Transactional    public void updateProduct(Product product, ProductLog productLog) {        // productDao.update(product,productLog);        productDao.update(product);        logDao.save(productLog);    }}