KAFKA-10787: Apply spotless to transaction-coordinator and server-common

[gongxuanzhang]

Brief Introduction

This PR is sub PR from #16097.
That Pr we add spotless plugin to build.gradle.
In order not to modify large-scale code, we plan apply it step by step in module.
The first is 'transaction-coordinator' 'server-common'.
Module 'transaction-coordinator' meets the requirements(only have 2 Java class) so apply it directly.
This PR update 'server-common' module code review import order.
We will apply spotless to all module in future

How to test:

We can run ./gradlew spotlessCheck check for code that does not meet requirements.
If we get report that error , we can run ./gradlew spotlessApply to review my code.
In this PR, all change(exclude build.gradle) byspotlessApply`

[chia7712]

LGTM

[chia7712]

@gongxuanzhang Could you please update the description to share the tips of "how to test this PR"?

[gongxuanzhang]

@chia7712 I changed it , plz take a look

[chia7712]

@gongxuanzhang Could you please check the build error?

[chia7712]

It seems we are facing Trolley problem :(

1. we use spotless 6.13 in order to support JDK 8
2. the google-format version used by spotless 6.13 has issue in JDK 21 (Fix Java 21 compatibilities diffplug/spotless#1920)

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Given that we are going to get rid of JDK 8 and there is example of ignoring JDK8
https://github.com/apache/kafka/blob/trunk/build.gradle#L2448

Maybe we can remove the support of JDK8 from spotless!

1. upgrade spotless to newest version
2. add JavaVersion.current().isJava11Compatible() check to apply spotless only if the env is JDK11+

@gongxuanzhang WDYT?

[gongxuanzhang]

I agree remove support JDK8.
I will change spotless version and comment

[chia7712]

@gongxuanzhang please fix the conflicts

[gongxuanzhang]

@chia7712 complete

[chia7712]

@gongxuanzhang Could you please rebase code to trigger QA again?

[chia7712]

the task `removeUnusedImports` is implemented by google-java-format, and unfortunately the google-java-format version used by spotless 6.14.0 can't work with JDK 21. Hence, we apply spotless tasks only if the env is either JDK11 or JDK17

WDYT?

[gongxuanzhang]

i will update comment

[chia7712]

I have called QA again

[chia7712]

@gongxuanzhang could you please rebase code to include #16249

[gongxuanzhang]

Okay, next we wait for CI @chia7712