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https://issues.apache.org/jira/browse/MYFACES-2645?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855121#action_12855121
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Leonardo Uribe commented on MYFACES-2645:
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Ok, now I understand. Yes, the solution is valid, so can let the committed
solution. It is a good idea to ask to jsr-314-open about this issue, so let's
see what happen. I would like to have some tests for this stuff, we can't test
is using junit, so we need something else.
> The view state is saved before encodeAll() is called on every UIViewParameter
> in an AJAX request
> ------------------------------------------------------------------------------------------------
>
> Key: MYFACES-2645
> URL: https://issues.apache.org/jira/browse/MYFACES-2645
> Project: MyFaces Core
> Issue Type: Bug
> Components: JSR-314
> Affects Versions: 2.0.0-beta-3
> Reporter: Jakob Korherr
> Assignee: Jakob Korherr
> Attachments: MYFACES-2645-spec-proposal.patch
>
>
> UIViewParameter calls setSubmittedValue() in encodeAll() to store the current
> value of the view parameter in the state as the submitted value (this helps
> UIViewParameter to restore its value on a postback).
> UIViewParameter.encodeAll() itself is called by UIViewRoot.encodeEnd() for
> every UIViewParameter in the view.
> If the current request is an ajax-request, the view state is currently
> already generated in UIViewRoot.encodeChildren() (before
> UIViewRoot.encodeEnd()). At this time the submitted value for every
> UIViewParameter is null, because its encodeAll()-method was not called yet.
> Later, when UIViewRoot.encodeEnd() is called, UIViewParameter.encodeAll() is
> called and it sets the submitted value correctly, but due to the fact that
> the state has already been generated, these changes are dropped.
> This causes the value of every UIViewParameter to be set to null in the next
> request, which will most likely end in validation problems with the required
> validator.
> The related thread to this issue from the mailing list can be found at:
> http://www.junlu.com/list/43/611590.html
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