Fix some minor issues discovered by PMD plugins

[manzhizhen]

What is the purpose of the change?

Fix some minor issues discovered by PMD (Programming Mistake Detector) plugins

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[AlbumenJ]

[manzhizhen]

https://github.com/apache/dubbo/actions/runs/12425957233/job/34693521096?pr=14969 May I ask if you saw this screenshot at an address? I have not been able to find the detailed reason for this formatting error