eye-gu opened a new issue, #5921:
URL: https://github.com/apache/shenyu/issues/5921
### Question
I have seen many recently pr change ==null to Objects.isNull. Can we
consider using checkstyle to avoid? I tried it locally and found that there are
quite a few areas that need to be modified.
checkstyle config as follows:
```xml
<module name="RegexpSinglelineJava">
<property name="format" value="==\s*null"/>
<property name="message" value="Use Objects.isNull() instead of == null"/>
</module>
<module name="RegexpSinglelineJava">
<property name="format" value="null\s*=="/>
<property name="message" value="Use Objects.isNull() instead of null =="/>
</module>
<module name="RegexpSinglelineJava">
<property name="format" value="!=\s*null"/>
<property name="message" value="Use Objects.nonNull() instead of != null"/>
</module>
<module name="RegexpSinglelineJava">
<property name="format" value="null\s*!="/>
<property name="message" value="Use Objects.nonNull() instead of null !="/>
</module>
```
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