Some code in example demo of Nacos and RocketMQ can not pass checkstyle plugin when building SCA

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Which Component
Example demo ——Nacos ,RocketMQ
Starters——Nacos

Describe the bug
When building the latest SCA cloned from github via maven, some of the SCA components (such as Nacos and RocketMQ) do not pass the checkstyle check and report an error

To Reproduce

1. git clone
2. mvn clean install -Dcheckstyle.skip=true -DkipTests
3. The terminal shows there are some lines in some of classes of SCA components(Nacos Config & RocketMQ) didn't pass the checkstyle plugin due to the codes in the component does not match the code style(the unused import statement , missing @return annotation in doc comments)

Expected behavior
The expected output of the terminal should pass the checkstyle plugin and build success when downloading the dependencies and build SCA core

Additional context
Windows11 、Java8 、 SCA version:2.2.X、maven version:3.3.9