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https://issues.apache.org/jira/browse/TAP5-105?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12643304#action_12643304
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Howard M. Lewis Ship commented on TAP5-105:
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BTW, your example creates TWO BeanEditForm instances; one via <t:beaneditform>
and one via @Component.
What you should do is either:
@InjectComponent
private BeanEditForm form;
<t:beaneditform t:id="form"/>
OR
@Component
private BeanEditForm form;
<form t:id="form"/>
> Defining a component in the class that does not appear in the template should
> be an exception (not a logged, and ignored, warning)
> ----------------------------------------------------------------------------------------------------------------------------------
>
> Key: TAP5-105
> URL: https://issues.apache.org/jira/browse/TAP5-105
> Project: Tapestry 5
> Issue Type: Bug
> Affects Versions: 5.0.15
> Reporter: Christoph Jäger
> Assignee: Howard M. Lewis Ship
> Priority: Minor
>
> I just spent quite some time to find a bug in my code.
> In my .tml I use a <t:BeanEditForm>. As soon as I added
> @Component
> private Form form;
> to the corresponding .java file (need to do some validation), the form was no
> longer rendered (the rest of the page was there, only the form was missing).
> Of course, using
> @Component
> private BeanEditForm form;
> instead fixes the problem.
> It took me long to find the problem, because there was no hint of what I was
> doing wrong. Maybe Tapestry could be enhanced to generate some kind of error
> message or warning in case of such misaligned component classes, instead of
> quietly dropping the form.
> Of course, enhancing the system to be able to use Form instead of
> BeanEditForm if you need just the basic features of Form, and not
> BeanEditForm in your java code, would be even better, but this seems
> difficult, as Form is not a super-class of BeanEditForm.
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