[jira] [Created] (KAFKA-17741) cleanup code base for JDK 11

[Chia-Ping Tsai (Jira)]

Chia-Ping Tsai created KAFKA-17741:
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             Summary: cleanup code base for JDK 11
                 Key: KAFKA-17741
                 URL: https://issues.apache.org/jira/browse/KAFKA-17741
             Project: Kafka
          Issue Type: Sub-task
            Reporter: Chia-Ping Tsai
            Assignee: Chia-Ping Tsai


1. `KafkaCompletableFuture` has many override methods from java 9, and they all 
need `@Override`annotation
2. remove `IS_JAVA9_COMPATIBLE` and `IS_JAVA11_COMPATIBLE`



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