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https://issues.apache.org/jira/browse/FLINK-30448?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yun Gao closed FLINK-30448.
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Resolution: Won't Fix
> "filter(Objects::nonNull)" will bring down task with failure cause:
> ClassCastException
> --------------------------------------------------------------------------------------
>
> Key: FLINK-30448
> URL: https://issues.apache.org/jira/browse/FLINK-30448
> Project: Flink
> Issue Type: Bug
> Components: API / DataStream
> Environment: test both on flink 1.15.1 and flink 1.16.0
> Intellij-Idea dev environment run
> Reporter: Yong
> Priority: Major
> Attachments: TestSideOutput.java
>
>
> Attached an *all-in-one* java program, which can run locally in DEV
> environment（e.g. IntelliJ IDEA->run）, consuming from elements stream objects,
> the object schema is a parent containing two childs(Child1 and Child2)
> fields, I use *side-output* to map and split out two different sub-streams,
> each for one child. I put '{*}filter(Objects:nonNUll){*}' for each sub-stream
> to ignore null objects. When comming from stream the parent record
> {*}containing any one of child is null{*}, the program will bring down the
> task and produce below error:
> ......
> switched from RUNNING to FAILED with failure cause:
> java.lang.{*}ClassCastException{*}: mytest.TestSideOutput$Child2 cannot be
> cast to mytest.TestSideOutput$Child1. Failed to push OutputTag with id
> 'child2' to operator. This can occur when multiple OutputTags with different
> types but identical names are being used.
> at
> org.apache.flink.streaming.runtime.tasks.CopyingChainingOutput.pushToOperator(CopyingChainingOutput.java:88)
> ......
>
> However, if I replace '{*}filter(Objects:nonNull){*}' (at line #71 and #90)
> with logically equivalent '{*}filter(x->x!=null){*}‘ (at line #70 and #89),
> everythink will be OK.
>
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