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https://issues.apache.org/jira/browse/TAPESTRY-1682?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jesse Kuhnert resolved TAPESTRY-1682.
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Resolution: Fixed
Fix Version/s: 4.1.3
> Parameters with defined with a default-value counted as "invariant"
> -------------------------------------------------------------------
>
> Key: TAPESTRY-1682
> URL: https://issues.apache.org/jira/browse/TAPESTRY-1682
> Project: Tapestry
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 4.1.2
> Reporter: Martino Piccinato
> Fix For: 4.1.3
>
>
> Even though I found this problem with Dialog component it seems to affect any
> similar component parameter, that is an optional component parameters with a
> constant default value, take as an example Dialog:
> <parameter name="hidden" default-value="true" />
> Unless the optional parameter is configured with a ognl method binding the
> parameter itself is somehow regarded as "Invariant" by ExpressionBinding
> class that will throw a ReadOnlyBindingException when trying to use a setter
> on it. In particular, for Dialog component this mean to fail everytime the
> component is show()/hide() as setHidden has to be called to set the actual
> status for the component.
> There seems to be some kind of confusion between the component parameter
> method and the binding method/default value here when creating the binding.
> In my opinion a "default-value" should be just a default value if the
> parameter is configured/initialized but this shouldn't prevent to use setters
> and getters on the parameter after the component is created. And this is the
> same thing that thought the creator of Dialog component I think :-)
> The way to repeat this is very simple: just use the Dialog component anywhere
> without using the hidden parameter and using hide() or show() at some time.
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