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Posted to issues@flink.apache.org by "Wojciech Indyk (Jira)" <ji...@apache.org> on 2019/12/03 07:56:00 UTC
[jira] [Commented] (FLINK-10264) Exception is misleading when no
default constructor define for events
[ https://issues.apache.org/jira/browse/FLINK-10264?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16986685#comment-16986685 ]
Wojciech Indyk commented on FLINK-10264:
----------------------------------------
It also happens when you try to use Scala Case Class as an input to the TableAPI, i.e. transform DataStream[MyCaseClass] -> registerDataStream(...)
> Exception is misleading when no default constructor define for events
> ---------------------------------------------------------------------
>
> Key: FLINK-10264
> URL: https://issues.apache.org/jira/browse/FLINK-10264
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Reporter: Swapan Shaw
> Priority: Major
>
> When I have not declare the default constructor in the RequestEvent then I got the below exception which is misleading.
>
> {code:java}
> DataStream<RequestEvent> inputStream = env.addSource(...)
> tEnv.registerDataStream(...);
> {code}
>
>
> {code:java}
> Exception in thread "main" org.apache.flink.table.api.TableException: Only the first field can reference an atomic type.
> at org.apache.flink.table.api.TableEnvironment$$anonfun$5.apply(TableEnvironment.scala:996)
> at org.apache.flink.table.api.TableEnvironment$$anonfun$5.apply(TableEnvironment.scala:991)
> at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
> at scala.collection.TraversableLike$$anonfun$flatMap$1.apply(TraversableLike.scala:241)
> at scala.collection.IndexedSeqOptimized$class.foreach(IndexedSeqOptimized.scala:33)
> at scala.collection.mutable.ArrayOps$ofRef.foreach(ArrayOps.scala:186)
> at scala.collection.TraversableLike$class.flatMap(TraversableLike.scala:241)
> at scala.collection.mutable.ArrayOps$ofRef.flatMap(ArrayOps.scala:186)
> at org.apache.flink.table.api.TableEnvironment.getFieldInfo(TableEnvironment.scala:991)
> at org.apache.flink.table.api.StreamTableEnvironment.registerDataStreamInternal(StreamTableEnvironment.scala:546)
> at org.apache.flink.table.api.java.StreamTableEnvironment.registerDataStream(StreamTableEnvironment.scala:133)}}{code}
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