Robert Metzger commented on FLINK-1390:

I'll ask the user who reported the issue whether the change in 1438 resolved it.

>  java.lang.ClassCastException: X cannot be cast to X
> ----------------------------------------------------
>                 Key: FLINK-1390
>                 URL: https://issues.apache.org/jira/browse/FLINK-1390
>             Project: Flink
>          Issue Type: Bug
>          Components: YARN Client
>    Affects Versions: 0.8
>            Reporter: Robert Metzger
> A user is affected by an issue, which is probably caused by different 
> classloaders being used for loading user classes.
> Current state of investigation:
> - the error happens in yarn sessions (there is only a YARN environment 
> available)
> - the error doesn't happen on the first time the job is being executed. It 
> only happens on subsequent executions.

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