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https://issues.apache.org/jira/browse/TAPESTRY-1978?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Kevin Menard reassigned TAPESTRY-1978:
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Assignee: Kevin Menard
> When passing in empty parameter, indicate problem parameter in error message.
> -----------------------------------------------------------------------------
>
> Key: TAPESTRY-1978
> URL: https://issues.apache.org/jira/browse/TAPESTRY-1978
> Project: Tapestry
> Issue Type: Improvement
> Components: Framework
> Affects Versions: 5.0.7
> Reporter: Kevin Menard
> Assignee: Kevin Menard
> Priority: Minor
>
> While prototyping a page recently, I decided to hold off on passing in
> parameters until I had a good sense of what their names should be. So, I had
> something similar to:
> <t:textfield value=""/>
> Clearly this is a broken construct and Tapestry generally recognized it. I
> was greeted with the following error message:
> "Parameter expression was null or contained only whitespace."
> And a highlighted block of my template. Unfortunately, the highlighted block
> is not where the problem was. Likewise, the error message really didn't
> indicate what parameter was broken of what component. After a little bit of
> guess-and-check, I caught the obvious error. It'd be nice if Tapestry
> handled this for me though.
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