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https://issues.apache.org/jira/browse/MYFACES-3596?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13440831#comment-13440831
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Leonardo Uribe commented on MYFACES-3596:
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Related spring webflow issue is https://jira.springsource.org/browse/SWF-1540
> NPE exception is thrown during ajax requests from webflow
> ---------------------------------------------------------
>
> Key: MYFACES-3596
> URL: https://issues.apache.org/jira/browse/MYFACES-3596
> Project: MyFaces Core
> Issue Type: Bug
> Components: General
> Affects Versions: 2.1.8
> Environment: myfaces-2.1.8 + richfaces-4.2.2 + webflow-2.3.1
> Reporter: Anton Zukovskij
> Assignee: Leonardo Uribe
> Attachments: log.log, swf-rf4.zip
>
>
> When using a4j:commanButton from webflow rendered view NullPointerException
> is thrown during restoreState of component (state==null). Changing to mojarra
> implementation solves this problem, therefore it is myfaces integration
> issue. Please see sample webapp and logs attached.
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