spring 配置hibernate 的问题

Question

--------------------------------------------applicationContext.xml-----------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" "http://www.springframework.org/dtd/spring-beans.dtd">
<beans>
<bean id="placeholderConfig"
class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="location">
<value>/properties/OracleDataSoures.properties</value>
</property>
</bean> <bean id="myDataSource"
class="com.mchange.v2.c3p0.ComboPooledDataSource"
destroy-method="close" dependency-check="none">
<property name="driverClass">
<value>${datasource.driverClassName}</value>
</property>
<property name="jdbcUrl">
<value>${datasource.url}</value>
</property>
<property name="user">
<value>${datasource.username}</value>
</property>
<property name="password">
<value>${datasource.password}</value>
</property>
<property name="acquireIncrement">
<value>${c3p0.acquireIncrement}</value>
</property>
<property name="initialPoolSize">
<value>${c3p0.initialPoolSize}</value>
</property>
<property name="minPoolSize">
<value>${c3p0.minPoolSize}</value>
</property>
<property name="maxPoolSize">
<value>${c3p0.maxPoolSize}</value>
</property>
<property name="maxIdleTime">
<value>${c3p0.maxIdleTime}</value>
</property>
<property name="idleConnectionTestPeriod">
<value>${c3p0.idleConnectionTestPeriod}</value>
</property>
<property name="maxStatements">
<value>${c3p0.maxStatements}</value>
</property>
<property name="numHelperThreads">
<value>${c3p0.numHelperThreads}</value>
</property>
</bean>
<bean id="mySessionFactory"
class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
singleton="true">
<property name="dataSource">
<ref local="myDataSource" />
</property>
<property name="mappingResources">
<list>
<!-- mapping files-->
                               </list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">
${hibernate.dialect}
</prop>
<prop key="hibernate.show_sql">
${hibernate.show_sql}
</prop>
<prop key="hibernate.jdbc.fetch_size">
${hibernate.jdbc.fetch_size}
</prop>
<prop key="hibernate.jdbc.batch_size">
${hibernate.jdbc.batch_size}
</prop>
<prop key="hibernate.connection.release_mode">
${hibernate.connection.release_mode}
</prop>
<prop key='hibernate.query.factory_class'>
${hibernate.query.factory_class}
</prop>
</props>
</property>
</bean>
</beans>java 文件
-------------------------------------------------------------------------------
package test;import java.sql.Connection;
import java.sql.SQLException;import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;
import org.springframework.orm.hibernate3.LocalSessionFactoryBean;import com.mchange.v2.c3p0.ComboPooledDataSource;
import com.mchange.v2.c3p0.DriverManagerDataSource;public class Test {public static void main(String[] args) throws SQLException {
ApplicationContext context = new ClassPathXmlApplicationContex("applicationContext.xml"); 
LocalSessionFactoryBean sessionFactoryBean = (LocalSessionFactoryBean) context
        .getBean("mySessionFactory");
 
         System.out.println(sessionFactoryBean.getConfiguration().buildSessionFactory().getCurrentSession());
}}
报错，说我类型转换异常LocalSessionFactoryBean sessionFactoryBean = (LocalSessionFactoryBean) context
        .getBean("mySessionFactory");
请问是为什么，谢了，我想获得hibernate 的session