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https://issues.apache.org/jira/browse/FEDIZ-96?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14356706#comment-14356706
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Jan Bernhardt commented on FEDIZ-96:
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The error occurs at the IDP. Just refresh the final logout screen in your
browser to run into this issue.
You can also invoke this link before login:
https://localhost:9443/fediz-idp/federation?wa=wsignout1.0
> Nullpointer exception if logout is called before login
> ------------------------------------------------------
>
> Key: FEDIZ-96
> URL: https://issues.apache.org/jira/browse/FEDIZ-96
> Project: CXF-Fediz
> Issue Type: Bug
> Components: IDP
> Affects Versions: 1.1.2
> Reporter: Jan Bernhardt
> Priority: Minor
> Fix For: 1.2.0
>
>
> If you invoke the logout URL twice or if your session has timed out, you will
> get a NullPointerException instead of a logout page.
> According to the WS-Federation standard, a logout request should be
> idempotent, thus it should be possible to invoke logout on a non existing
> session without causing an exception.
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