Github user aljoscha commented on the issue:
https://github.com/apache/flink/pull/4655
A local build of `mvn clean verify` fails for me because the japicmp plugin
is complaining. The relevant section of the diff output from japicmp is
```
***! MODIFIED CLASS: PUBLIC org.apache.flink.streaming.api.scala.DataStream
(not serializable)
---! REMOVED METHOD: PUBLIC(-) boolean iterate$default$3()
+++ NEW METHOD: PUBLIC(+)
org.apache.flink.streaming.api.scala.DataStream setMaxParallelism(int)
*** MODIFIED ANNOTATION: scala.reflect.ScalaSignature
```
i.e. it's complaining about `iterate$default$3()`. The problem seems to be
that Scala will generate some obfuscated method name for the `iterate()` method
and the `@PublicEvolving` annotation is not properly applied to that. I tried
playing around with the japicmp config in the root pom file but to no avail.
Maybe you can find something that works.
What I added is this:
```
<exclude>org.apache.flink.streaming.api.scala.DataStream#iterate$default$3()</exclude>
```
but it seems that doesn't work.
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