Spring编程式定义事务DefaultTransactionDefinition的问题

     @Autowired
    private DataSourceTransactionManager transactionManager;
    @Override
    public void test() {
        DefaultTransactionDefinition def=new DefaultTransactionDefinition();
        TransactionStatus transactionStatus = transactionManager.getTransaction(def);
        for(int i=1030;i<1036;i++){
            System.out.println(lowPriceGroupDao.test1(i));//更新一个值
            transactionManager.commit(transactionStatus);
        }
    }

对于一个事务来说只能调用一次commit，但是为什么第二次还可以commit成功？？？我是说第二次虽然报错但是还可以修改成功
org.springframework.transaction.IllegalTransactionStateException:
Transaction is already completed - do not call commit or rollback more than once per transaction

spring 编程式事务