Stephan Ewen created FLINK-8264:
-----------------------------------
Summary: 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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