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https://issues.apache.org/struts/browse/WW-2512?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeromy Evans resolved WW-2512.
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Resolution: Fixed
Committed check for the null case
> DefaultHttpHeaders throws NPE trying to generate ETag when model is null
> ------------------------------------------------------------------------
>
> Key: WW-2512
> URL: https://issues.apache.org/struts/browse/WW-2512
> Project: Struts 2
> Issue Type: Bug
> Components: Plugin - REST
> Affects Versions: 2.1.1
> Reporter: Jeromy Evans
> Priority: Minor
> Fix For: 2.1.1
>
>
> DefaultHttpHeaders attempts to generate an ETag using the hashcode of the
> model if not disabled and not explicitly specified. This throws an NPE if
> the model is null, which may be the case for some create operations. Rather
> than mandate that ETag must be explicitly disabled, just don't generate one
> if it's not relevant.
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