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https://issues.apache.org/jira/browse/WW-4103?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13681180#comment-13681180
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Andrew Murdoch commented on WW-4103:
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I would suggest that if the error code passed to sendError is
HttpServletResponse.SC_NOT_FOUND then perhaps the log should be a warning or
lower, otherwise it should be an error.
> When an action is not found an error which cannot be silenced is logged when
> not in dev mode
> --------------------------------------------------------------------------------------------
>
> Key: WW-4103
> URL: https://issues.apache.org/jira/browse/WW-4103
> Project: Struts 2
> Issue Type: Bug
> Affects Versions: 2.3.14.3
> Reporter: Andrew Murdoch
> Priority: Minor
> Fix For: 2.3.16
>
>
> WW-2874 describes a scenario in which crawlers hitting an all lowercase
> version of an action name returns a 404 but also logs an error. The solution
> was to only log errors in devMode.
> However the same exception is passed to the sendError method which later it
> again as an error only when not in dev mode. This exception cannot be
> silenced without silencing the whole of the Dispatcher class.
> In dev mode the Exception is logged as debug.
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