记录一个初学mybatis的错误

在测试的时候，sqlSession一直报空指针异常，把倒数第3行改一下就行了

    SqlSession sqlSession;
    UsersMapper usersMapper;

    @Before
    public void openSqlSession() throws IOException {
        InputStream in = Resources.getResourceAsStream("SqlMapConfig.xml");
        SqlSessionFactory sqlSessionFactory = new SqlSessionFactoryBuilder().build(in);
        sqlSession = sqlSessionFactory.openSession();
        usersMapper = sqlSession.getMapper(UsersMapper.class); //这里不要写成usersMapper.getClass()
        System.out.println("fsafasgqpwijg;samg;amoigmagkaew;ogiaern;goiaem;aerg"+usersMapper);
    }