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https://issues.apache.org/jira/browse/SPARK-21068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16047338#comment-16047338
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Felix Cheung commented on SPARK-21068:
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surely. what brings you to R land? :)
> SparkR error message when passed an R object rather than Java object could be
> more informative
> ----------------------------------------------------------------------------------------------
>
> Key: SPARK-21068
> URL: https://issues.apache.org/jira/browse/SPARK-21068
> Project: Spark
> Issue Type: Improvement
> Components: SparkR
> Affects Versions: 2.2.0, 2.3.0
> Reporter: holdenk
> Priority: Trivial
>
> SparkR when passed a non-Java object and expecting a Java object SparkR's
> backend code has an error message which is `Error: clas(objId) == "jobj" is
> not TRUE`.
> See backend.R and the isInstanceOf function
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