mybatis中的缓存问题解析

SqlSession sqlSession = null;    try {      sqlSession = DBUtils.openSqlSession();      UserMapper mapper = sqlSession.getMapper(UserMapper.class);      //查询同一条数据时会缓存      User user = mapper.getUser(1l);      User user2 = mapper.getUser(1l);      System.out.println(user.toString());      System.out.println(user2.toString());      sqlSession.commit();    } catch (Exception e) {      System.err.println(e.getMessage());      sqlSession.rollback();    } finally {      if (sqlSession != null) {        sqlSession.close();      }    }