Hibernate+JUnit的问题

Question

我的hibernate配置文件:  
<?xml  version="1.0"  encoding="utf-8"?>  
<!DOCTYPE  hibernate-configuration  
PUBLIC  "-//Hibernate/Hibernate  Configuration  DTD//EN"  
"http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">  
 
<hibernate-configuration>  
 
<session-factory>  
 
 
<property  name="hibernate.connection.driver_class">org.gjt.mm.mysql.Driver                        
</property>  
<property  name="hibernate.connection.url">  
jdbc:mysql://localhost:3306/mysample  
</property>  
<property  name="hibernate.connection.username">  
root                                                                              
</property>  
<property  name="hibernate.connection.password">  
                                                                   
</property>  
 
<property  name="dialect">  
net.sf.hibernate.dialect.MySQLDialect          
</property>  
 
<property  name="hibernate.show_sql">  
True  
</property>  
<property  name="hibernate.use_outer_join">  
True  
</property>  
<property  name="hibernate.transaction.factory_class">  
net.sf.hibernate.transaction.JDBCTransactionFactory  
</property>  
 
<mapping  resource="org/redsaga/quickstart/Tuser.hbm.xml"/>  
</session-factory>  
</hibernate-configuration>  
我的JUnit测试用例:  
import  java.util.List;  
 
import  junit.framework.Assert;  
import  junit.framework.TestCase;  
import  net.sf.hibernate.HibernateException;  
import  net.sf.hibernate.Session;  
import  net.sf.hibernate.SessionFactory;  
import  net.sf.hibernate.Transaction;  
import  net.sf.hibernate.cfg.Configuration;  
 
public  class  HibernateTest  extends  TestCase  {  
             
                       Session  session=null;  
                                   protected  void  setUp()  
                                   {  
                                               try  
                                               {  
                                                           Configuration  config=new  Configuration().configure();  
                                                           SessionFactory  sessionFactory=config.buildSessionFactory();  
                                                           session=sessionFactory.openSession();  
                                               }  
                                               catch(HibernateException  e)  
                                               {  
                                                           e.printStackTrace();  
                                               }  
                                   }  
                                   protected  void  tearDown()  
                                   {  
                                               try  
                                               {  
                                                           session.close();  
                                               }  
                                               catch(HibernateException  e)  
                                               {  
                                                           e.printStackTrace();  
                                               }  
                                   }  
                                   public  void  testInsert()  
                                   {  
                                               Transaction  tran=null;  
                                               try  
                                               {  
                                                           tran=session.beginTransaction();  
                                                           Tuser  user=new  Tuser();  
                                                           user.setName("Emma");  
                                                           session.save(user);  
                                                           session.flush();  
                                                           tran.commit();  
                                                           Assert.assertEquals(user.getId().intValue()>0,true);  
                                               }  
                                               catch(HibernateException  e)  
                                               {  
                                                           e.printStackTrace();  
                                                           Assert.fail(e.getMessage());  
                                                           if  (tran!=null)  
                                                           {  
                                                                       try  
                                                                       {  
                                                                                   tran.rollback();  
                                                                       }  
                                                                       catch(HibernateException  e1)  
                                                                       {  
                                                                                   e1.printStackTrace();  
                                                                       }  
                                                           }  
                                               }  
                                   }  
                                   public  void  testSelect()  
                                   {  
                                               String  hql="from  Tuser  where  name='Emma'";  
                                               try  
                                               {  
                                                           List  userList=session.createQuery(hql).list();  
                                                           Tuser  user=(Tuser)userList.get(0);  
                                                           Assert.assertEquals(user.getName(),"Emma");  
                                               }  
                                               catch(HibernateException  e)  
                                               {  
                                                           e.printStackTrace();  
                                                           Assert.fail(e.getMessage());  
                                               }  
                                   }  
 
}  
已将MySQL驱动类包添加到工程类库,测试HibernateTest时出现异常net.sf.hibernate.HibernateException:  JDBC  Driver  class  not  found:  com.mysql.jdbc.Driver  
检查了一下,是session=sessionFactory.openSession();的问题,难道是我的驱动类包的问题?  
请高手指教,不用感激!!