TisonKun commented on issue #7302: [FLINK-11156] [tests] Reconcile ZooKeeperCompletedCheckpointStoreMockitoTest with JDK 9 URL: https://github.com/apache/flink/pull/7302#issuecomment-448048599 @GJL for "It is not obvious why Comparator.comparing does not work.", I did a survey and it points to a call to static method of interface(`Comparator#comparing` here) while using previous version of ASM(of course mock framework hacking bytecodes). Groovy community has suffered this issue. FYI, https://issues.apache.org/jira/browse/GROOVY-8338 https://issues.apache.org/jira/browse/GROOVY-8528
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