Yaozeyu

Please answer some questions before submitting your issue. Thanks! ### Which version of XXL-JOB do you using? ### Expected behavior ### Actual behavior ### Steps to reproduce the behavior ###...

In this PR, I removed some redundant code under common and adjusted some formats.

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Signed-off-by: ## Pre-Checklist Note: Please complete **_ALL_** items in the following checklist. - [x] I have read through the [CONTRIBUTING.md](https://github.com/bytedance/bitsail/blob/master/docs/contributing.md) documentation. - [x] My code has the necessary comments and...

About whether it is possible to annotate enum values？

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Is this necessary? Is it more friendly to add comments to enumeration fields for future maintainers? Because people like me who are new to this project may want to understand...

Questions about legacy code not being used?

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Whether such unused methods can be deleted, or are these methods useful for later new features, there are currently some methods that are not used in the project.

fix: Null pointer error may occur

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@rmorgan @joshlong @javiereguiluz @trisberg