[PR] MINOR: Replace Collections factory methods with Java 11+ equivalents in group-coordinator and part of clients [kafka]

["see-quick (via GitHub)" <gi...@apache.org>]

see-quick opened a new pull request, #21876:
URL: https://github.com/apache/kafka/pull/21876

   This PR is another one with changing old JDK 8 API to JDK 11.
   It's changing in the whole `group-coordinator` module and part of clients (i.e., common/requests, common/errors, common/config). I didn't want to do the whole... because it would be more bigger change ...
   
   Also I have faced the issue where in  `GroupCoordinatorService we use `Collections.singletonList(null)` so I skipped that as `List.of(...)` would break the code. Moreover in `AssignorHelpers` there is `Collections.emptyMap().getClass()` which is using reflection and that I would also use different class  ...


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Re: [PR] MINOR: Replace Collections factory methods with Java 11+ equivalents in group-coordinator and part of clients [kafka]

["chia7712 (via GitHub)" <gi...@apache.org>]

chia7712 merged PR #21876:
URL: https://github.com/apache/kafka/pull/21876


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