Close Resources Properly

[kamaci]

• I have searched the issues of this repository and believe that this is not a duplicate.
• I have checked the FAQ of this repository and believe that this is not a duplicate.

Environment

• Dubbo version: xxx
• Operating System version: xxx
• Java version: xxx

Steps to reproduce this issue

1. xxx
2. xxx
3. xxx

Pls. provide [GitHub address] to reproduce this issue.

Expected Result

What do you expected from the above steps？

Actual Result

What actually happens?

If there is an exception, please attach the exception trace:

Just put your stack trace here!

[chickenlj]

Thanks. Please provide valid information about your problem so we can help.

[kamaci]

Thanks. Please provide valid information about your problem so we can help.

It is not easy to produce this bug, so I couldn't give more information.

I've created a PR for this: #3474