使用junit4测试的时候报错：Specified JDBC Driver class not found，请教各位大神，这该怎么弄

[qq_36784082]

源码：
public class LeaderPersonDaoImplTest {
private static LeaderPersonDaoImpl leaderPersonDao = new LeaderPersonDaoImpl();
public static SessionFactory sessionFactory = null;
public static final Logger logger = LoggerFactory.getLogger(LeaderPersonDaoImpl.class);//日志
private static Transaction transaction;
private static Session session;
@BeforeClass
public static void runBeforeClass(){
try {
//创建配置对象
Configuration config = new Configuration();
//创建服务注册对象
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(config.configure().getProperties()).buildServiceRegistry();
//创建会话工厂对象
sessionFactory = config.buildSessionFactory(serviceRegistry);
//sessionFactory = new AnnotationConfiguration().configure().buildSessionFactory();
//会话对象
session = sessionFactory.openSession();
//开启事务
transaction = session.beginTransaction();

} catch (HibernateException e) {
e.printStackTrace();
}
}

@Test
public void testGetPersonList() throws Exception {
HashMap map = new HashMap();
map.put("userName", "周东伟");
map.put("pageIndex", 1);
map.put("pageSize", 15);
Map m = leaderPersonDao.getPersonList(map);
assertNotNull(m);
}
@AfterClass
public static void afterClass() {
transaction.commit();//提交事务
session.close();//关闭会话
sessionFactory.close();//关闭会话工厂
}
}


在获取session的时候报错
org.hibernate.service.classloading.spi.ClassLoadingException: Specified JDBC Driver class not found
at org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl.configure(DriverManagerConnectionProviderImpl.java:107)
at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.buildJdbcConnectionAccess(JdbcServicesImpl.java:223)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:89)
at org.hibernate.service.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:75)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:159)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:131)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:73)
at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2283)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2279)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1748)
at test.com.rails.system.controller.manage.LeaderPersonDaoImplTest.runBeforeClass(LeaderPersonDaoImplTest.java:42)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[2018-04-10 14:23:45]INFO org.hibernate.service.jdbc.connections.internal.DriverManagerConnectionProviderImpl(line:96) -HHH000402: Using Hibernate built-in connection pool (not for production use!)

[qq_36784082]

单纯启动项目的时候是没有问题的，只在junit测试的时候出现这个错误

[yang_coder]

.ClassLoadingException你百度看看这种错误是什么解释。我也是小白，一般都是先看错误的类型