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https://issues.apache.org/jira/browse/FLINK-8264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16292615#comment-16292615
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ASF GitHub Bot commented on FLINK-8264:
---------------------------------------
Github user StephanEwen closed the pull request at:
https://github.com/apache/flink/pull/5167
> Add Scala to the parent-first loading patterns
> ----------------------------------------------
>
> Key: FLINK-8264
> URL: https://issues.apache.org/jira/browse/FLINK-8264
> Project: Flink
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.4.0
> Reporter: Stephan Ewen
> Assignee: Stephan Ewen
> Fix For: 1.5.0, 1.4.1
>
>
> A confusing experience happens when users accidentally package the Scala
> Library into their jar file. The reversed class loading duplicates Scala's
> classes, leading to exceptions like the one below.
> By adding {{scala.}} to the default 'parent-first-patterns' we can improve
> the user experience in such situations.
> Exception Stack Trace:
> {code}
> java.lang.ClassCastException: cannot assign instance of
> org.peopleinmotion.TestFunction$$anonfun$1 to field
> org.apache.flink.streaming.api.scala.DataStream$$anon$7.cleanFun$6 of type
> scala.Function1 in instance of
> org.apache.flink.streaming.api.scala.DataStream$$anon$7
> at
> java.io.ObjectStreamClass$FieldReflector.setObjFieldValues(ObjectStreamClass.java:2233)
> at
> java.io.ObjectStreamClass.setObjFieldValues(ObjectStreamClass.java:1405)
> at
> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2288)
> at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2206)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2064)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1568)
> at
> java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:2282)
> at
> java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:2206)
> at
> java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:2064)
> at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1568)
> at java.io.ObjectInputStream.readObject(ObjectInputStream.java:428)
> at
> org.apache.flink.util.InstantiationUtil.deserializeObject(InstantiationUtil.java:290)
> at
> org.apache.flink.util.InstantiationUtil.readObjectFromConfig(InstantiationUtil.java:248)
> at
> org.apache.flink.streaming.api.graph.StreamConfig.getStreamOperator(StreamConfig.java:220)
> ... 6 more
> {code}
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