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https://issues.apache.org/jira/browse/FLINK-12303?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16842035#comment-16842035
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Aljoscha Krettek commented on FLINK-12303:
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I agree it's a bit buried in the stack but the problem is there in the trace:
{code:java}
Caused by: java.lang.NullPointerException
at com.esotericsoftware.kryo.Kryo.getSerializer(Kryo.java:476)
at com.esotericsoftware.kryo.Kryo.copy(Kryo.java:862)
at
org.apache.flink.api.java.typeutils.runtime.kryo.KryoSerializer.copy(KryoSerializer.java:217)
at
org.apache.flink.api.scala.typeutils.CaseClassSerializer.copy(CaseClassSerializer.scala:101)
at
org.apache.flink.api.scala.typeutils.CaseClassSerializer.copy(CaseClassSerializer.scala:32)
at
org.apache.flink.api.scala.typeutils.TrySerializer.copy(TrySerializer.scala:51)
at
org.apache.flink.api.scala.typeutils.TrySerializer.copy(TrySerializer.scala:33){code}
Kryo is failing to serialize (or copy) a field in the case class.
I think it's hard to get a more specific error message from the Flink side
because this happens in Kryo. But maybe someone will pick up this issue.
> Scala 2.12 lambdas does not work in event classes inside streams.
> -----------------------------------------------------------------
>
> Key: FLINK-12303
> URL: https://issues.apache.org/jira/browse/FLINK-12303
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream, API / Scala
> Affects Versions: 1.7.2
> Environment: Scala 2.11/2.12, Oracle Java 1.8.0_172
> Reporter: Matěj Novotný
> Priority: Major
>
> When you use lambdas inside event classes used in streams it does work in
> Scala 2.11. It stoped working in Scala 2.12. It does compile but does not
> process any data and does not throw any exception. I would expect that it
> would not compile in case I have used some not supported field in event class
> or I would throw some exception at least.
>
> For more detail check my demonstration repo, please:
> [https://github.com/matej-novotny/flink-lambda-bug]
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