异常 002 出现异常:connection closed，大佬们求教，是不是多线程影响到了，下面是方法

@Resource
private SqlSessionTemplate sqlSessionTemplate;

public void threadInsert(List studentVOList) throws SQLException {long start = System.currentTimeMillis();
    Connection connection = sqlSessionTemplate.getConnection();
    CacheTestMapper cacheTestMapper
            = sqlSessionTemplate
            .getSqlSessionFactory()
            .openSession()
            .getMapper(CacheTestMapper.class);
    try {
        // 设置手动提交
        connection.setAutoCommit(false);
        // 先删除数据
        cacheTestMapper.deleteStudentById(1L);
        // 获取线程池
        ExecutorService executorService = ExecutorUtil.getThreadPool();
        // 拆分数据创建任务
        List> lists = this.averageAssign(studentVOList, 5);
        Thread[] threads = new Thread[lists.size()];
        // 监控子线程执行完毕, 再执行主线程, 要不然会导致主线程关闭, 子线程也会随着关闭
        CountDownLatch countDownLatch = new CountDownLatch(lists.size());
        for (int i = 0; i < lists.size(); i++) {List list = lists.get(i);
            threads[i] = new Thread(() -> {
                try {
                    // 批量添加,mybatisPlus 中自带的 batch 方法
                    cacheTestMapper.batchInsert(list);
                } finally {countDownLatch.countDown();
                }
            });
        }
        for (int i = 0; i < lists.size(); i++) {executorService.execute(threads[i]);
        }
        // 当子线程执行完毕时, 主线程再往下执行
        countDownLatch.await();
        System.out.println("添加完毕");
        connection.commit();
        long end = System.currentTimeMillis();
        System.out.println("多线程耗时：" + (end - start));
    } catch (Exception e) {connection.rollback();
        throw new RuntimeException("002 出现异常:" + e.getMessage());
    } finally {connection.close();
    }
}