Configuration config = new Configuration().configure(); 一直报空指针异常

//1.创建一个配置对象

Configuration config = new Configuration().configure();

//2.创建服务注册对象

// ServiceRegistry serviceRegistry =new 

// ServiceRegistryBuilder().applySettings(config.getProperties()).build();

StandardServiceRegistryBuilder ssrb = new 

StandardServiceRegistryBuilder().applySettings(config.getProperties());

StandardServiceRegistry ssr = ssrb.build();

//3.创建sessionFactory 会话工厂

SessionFactory sf = config.buildSessionFactory(ssr);

Session session =sf.getCurrentSession();

//创建SchemaExport 生成表结构

SchemaExport export =new SchemaExport(config);

export.create(true, true);

<property name="connection.username">root</property>

<property name="connection.password">123456</property>

<property name="connection.driver_class">com.mysql.jdbc.Driver</property>

<property name="connection.url">jdbc:mysql://localhost:3306/test?useUnicode=true&amp;characterEncoding=UTF-8</property>

<property name="dialect">org.hibernate.dialect.MySQLDialect</property>

<property name="show_sql">true</property>

<property name="format_sql">true</property>

<property name="hbm2ddl.auto">update</property>

<property name="hibernate.current_session_context_class">thread</property>

<!--对应的映射 -->

<mapping resource="entity/Students.hbm.xml" />

<mapping resource="entity/Users.hbm.xml" />

我实在在不到方法求问慕课的朋友们帮忙一下