[jira] [Assigned] (BEAM-1858) improve error message when Create.of() is called with an empty iterator

["Aviem Zur (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/BEAM-1858?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aviem Zur reassigned BEAM-1858:
-------------------------------

    Assignee: Davor Bonaci  (was: Frances Perry)

> improve error message when Create.of() is called with an empty iterator
> -----------------------------------------------------------------------
>
>                 Key: BEAM-1858
>                 URL: https://issues.apache.org/jira/browse/BEAM-1858
>             Project: Beam
>          Issue Type: Improvement
>          Components: sdk-java-core
>            Reporter: Wesley Tanaka
>            Assignee: Davor Bonaci
>
> The current error copy states:
> "java.lang.IllegalArgumentException: Elements must be provided to construct the default Create Coder. To Create an empty PCollection, either call Create.empty(Coder), or call 'withCoder(Coder)' on the result PTransform"
> This is potentially confusing for two reasons:
> 1. "the default Create Coder" assumes a high level of knowledge of how Create class works
> 2. since "Create" is a common word, it may not be immediately clear that Create is referring to org.apache.beam.sdk.transforms.Create as opposed to the possibility that there might be a compound noun in Beam model called "Create Coder"



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