Kenneth Knowles updated BEAM-1289:
    Component/s:     (was: sdk-java-extensions)

> TextIO (and others) should provide more informative messages when 
> encountering RVP
> ----------------------------------------------------------------------------------
>                 Key: BEAM-1289
>                 URL: https://issues.apache.org/jira/browse/BEAM-1289
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-java-core
>            Reporter: Ben Chambers
>            Assignee: Sam McVeety
>            Priority: Minor
>              Labels: starter
> https://github.com/apache/beam/blob/master/sdks/java/core/src/main/java/org/apache/beam/sdk/io/TextIO.java#L301
> When reporting failing to validate because a parameter comes from a 
> RuntimeValueProvider (such as when creating templates) we report:
> "Cannot validate with a RVP"
> We should instead provide a message saying what went wrong and how to fix it. 
> Something like:
> "Unable to validate parameters that aren't available until runtime. Disable 
> validation using .withoutValidation()."

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