Github user greghogan commented on the issue:
https://github.com/apache/flink/pull/3567
@aljoscha, I likewise have no great preference for import order. I do think
it is important for the checkstyle to match IntelliJ's code style, either the
default or a provided Flink style.
The default IntelliJ import style can be approximated:
```
<module name="CustomImportOrder">
<property name="customImportOrderRules"
value="THIRD_PARTY_PACKAGE###SPECIAL_IMPORTS###STANDARD_JAVA_PACKAGE###STATIC"/>
<property name="specialImportsRegExp" value="^javax\."/>
<property name="standardPackageRegExp" value="^java\."/>
<property name="sortImportsInGroupAlphabetically" value="true"/>
<property name="separateLineBetweenGroups" value="false"/>
</module>
```
That includes a blank line between `javax` and `java` imports. There is an
[old ticket with recent
activity](https://github.com/checkstyle/checkstyle/issues/525) for this issue
to allow blank lines to be explicitly defined.
That said, I'd go for the Google Style as used in this PR. IntelliJ can
import from a checkstyle configuration but I am not seeing any effect from this.
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