首先看错误信息

@Test
    public void test8() throws Exception {
        InputStream resourceAsStream = Resources.getResourceAsStream("sqlMapConfig.xml");
        SqlSessionFactory build = new SqlSessionFactoryBuilder().build(resourceAsStream);
        SqlSession sqlSession = build.openSession();

        UserMapper mapper = sqlSession.getMapper(UserMapper.class);

        PageHelper.startPage(1,3);

        List<User> all = mapper.findAll();
        for (User user : all) {
            System.out.println(user);
        }

        PageInfo<User> pageInfo = new PageInfo<User>(all);
        System.out.println("当前页:"+pageInfo.getPageNum());
        System.out.println("每页显示条数:"+pageInfo.getPageSize());
        System.out.println("总记录数:"+pageInfo.getTotal());
        System.out.println("总页数:"+pageInfo.getPages());
        System.out.println("上一页:"+pageInfo.getPrePage());
        System.out.println("下一页:"+pageInfo.getNextPage());
        System.out.println("是否是第一页:"+pageInfo.isIsFirstPage());
        System.out.println("是否是最后一页:"+pageInfo.isIsLastPage());
    }

使用mybatis做分页查询的时候报的错:
解决方案:将jsqlparser依赖换成高版本的就行了,使用0.9版本以下的都会报错

        <dependency>
            <groupId>com.github.pagehelper</groupId>
            <artifactId>pagehelper</artifactId>
            <version>5.2.0</version>
        </dependency>

        <dependency>
            <groupId>com.github.jsqlparser</groupId>
            <artifactId>jsqlparser</artifactId>
            <version>4.0</version>
        </dependency>

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