关于rocketmq demo问题

[smipo]

Issue Description

Type: bug report or feature request

Describe what happened (or what feature you want)

在运行SyncProducer和PullConsumerDemo程序时，抛出异常，但是运行并未结束。
以下分别两个类运行的截图

Describe what you expected to happen

希望deno运行异常时，正常结束程序

How to reproduce it (as minimally and precisely as possible)

Tell us your environment

master分支

Anything else we need to know?

[sczyh30]

You may submit a PR to improve this.

[PeineLiang]

You may submit a PR to improve this.

I want to solve it, please assign to me.

[sczyh30]

You may submit a PR to improve this.

I want to solve it, please assign to me.

Any progress?

[PeineLiang]

You may submit a PR to improve this.

I want to solve it, please assign to me.

Any progress?

I saw the issue had not been assigned to me, so I didn't do anything, and now i submit a PR, please review it.