请问大神怎么获得会话工厂

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
    <property name="driverClassName" value="com.mysql.jdbc.Driver"></property>
    <property name="url" value="jdbc:mysql:///test"></property>
    <property name="username" value="root"></property>
    <property name="password" value="root"></property>
</bean>

<!-- acquire sessionFactory -->
<bean id="sessionFactory"
    class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
    <property name="dataSource">
        <ref bean="dataSource" />
    </property>
    <property name="hibernateProperties">
        <props>
            <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
            <prop key="hibernate.current_session_context_class">thread</prop>
        </props>
    </property>
</bean>


然后调用sessionFactory
@Resource
private  SessionFactory sessionFactory;
public void setSessionFactory(SessionFactory sessionFactory) {
    this.sessionFactory = sessionFactory;

    出现nullpointException,请问sessFactory应该怎么配置呢？各位大神求支招

上面代码省略了一些，重点是sessionFacory的配置

http://my.oschina.net/qsyan/blog/96485