@Repository("userDAO")
public class UserDAOImpl implements UserDAO {    
    private HibernateTemplate hibernateTemplate;
    @Resource//让spring注入进来
    public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
        this.hibernateTemplate = hibernateTemplate;
    }
    public void add(User u) {
        hibernateTemplate.save(u);
    }
}

@Repository("logDAO")
public class LogDAOImpl implements LogDAO {
    private HibernateTemplate hibernateTemplate;    
    @Resource//让spring注入进来
    public void setHibernateTemplate(HibernateTemplate hibernateTemplate) {
        this.hibernateTemplate = hibernateTemplate;
    }
    @Override
    public void add(Log log) {
        System.out.println("调用了LogDAO的add方法！");
        hibernateTemplate.save(log);
        throw new RuntimeException("日志打印异常！");
    }
}

@Service("userService")
public class UserServiceImpl implements UserService{
    private UserDAO userDAO;
    private LogDAO logDAO;
    public UserDAO getUserDAO() {
        return userDAO;
    }
    public LogDAO getLogDAO() {
        return logDAO;
    }
    @Resource
    public void setLogDAO(LogDAO logDAO) {
        this.logDAO = logDAO;
    }
    @Resource
    public void setUserDAO(UserDAO userDAO) {
        this.userDAO = userDAO;
    }    
    @Transactional
    public void add(User u){
        logDAO.add(new Log("a user saved!"));
        userDAO.add(u);
    }
    
}

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context"
    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-3.0.xsd     
    http://www.springframework.org/schema/context 
    http://www.springframework.org/schema/context/spring-context-3.0.xsd     
    http://www.springframework.org/schema/aop 
    http://www.springframework.org/schema/aop/spring-aop-3.0.xsd
    http://www.springframework.org/schema/tx 
    http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">
    <!--把com.hktk包下的东西交给spring管理 -->
    <context:component-scan base-package="com.hktk" />    
    <!-- 加载properties文件 -->
    <context:property-placeholder location="classpath:jdbc.properties" />
    <!-- 配置数据源 -->
    <bean id="dataSource" destroy-method="close"
        class="org.apache.commons.dbcp.BasicDataSource">
        <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>
    <!-- 配置sessionFactory -->
    <bean id="sessionFactory"
        class="o