Github user mlipkovich commented on the issue: https://github.com/apache/flink/pull/4655 Thansk, Aljoscha Probably I've forgotten to run `clean`. The method `iterate$default$3` is a method which automatically created by Scala for calculation of default value for parameter `keepPartitioning`. I tried different ways to exclude it but it didn't help. Anyway it should be somehow tracked by japicmp so I created the issue there https://github.com/siom79/japicmp/issues/176
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